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A fractional Darcian model‐based analytical solution for non‐Darcian flow toward a fully penetrating well in a confined aquifer Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-25 Kun Tu, Qiang Wu, Hongwei Zhang, Xiang Li
The Forchheimer and Izbash equations have been long employed to investigate the behavior of non‐Darcian flow toward a well in various aquifer systems, but both two equations inevitably introduce problems such as more or less empirical nature, and dimensional unbalance. Therefore, this work makes the attempt to introduce the fractional Darcian model for characterizing the non‐Darcian behavior flow toward
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Performance analysis of multilayered transversely isotropic saturated media under temperature and horizontally circular loads Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-24 Wei Yong Feng, Zhi Yong Ai
This study constructs a multilayered transversely isotropic saturated model under thermal and horizontally circular loads, and further investigates the model's thermo‐hydro‐mechanical coupling response. Firstly, the ordinary differential matrix equations of thermoelastic saturated media in the integral transformed domain are derived. Secondly, the solution for multilayered thermoelastic saturated media
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Transversely isotropic effects on the coupled thermo‐hydro‐mechanical performance for layered saturated media Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-24 Yong Zhi Zhao, Zhenming Shi, Zhi Yong Ai
In this manuscript, a novel transformed differential quadrature solution to the coupled thermo‐hydro‐mechanical (THM) problem of layered transversely isotropic (TI) saturated media is proposed, accompanied by a sensitivity analysis of pertinent parameters. Initially, the THM governing equations that encompass the transverse isotropy characteristics of thermal, permeable, and mechanical properties are
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Numerical investigation on the influence of secondary flaw lengths on the mechanical characteristics and cracking behaviour of red sandstone containing orthogonal cross flaws Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-24 Rongchao Xu, Baoyang Dou, Ying Zhao, Wenbin Peng, Zhen Li
Flaw length has a significant effect on the cracking behaviour of fractured rock. PFC2D was used to simulate the uniaxial compression of red sandstone samples with secondary flaw lengths L2 of 0 mm, 5 mm, 10 mm, 15 and 20 mm under different primary flaw angles α(α = 0°, 15°, 30°, 45°, 60°, 75°, and 90°). Based on the simulation results, the effects of the secondary flaw length on the mechanical parameters
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Semi‐implicit material point method for simulating infiltration‐induced failure of unsaturated soil structures Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-24 Soma Hidano, Yuya Yamaguchi, Shinsuke Takase, Shuji Moriguchi, Kenji Kaneko, Kenjiro Terada
This study presents a semi‐implicit MPM to adequately characterize the mechanical behavior of unsaturated soil based on Biot's mixture theory. To represent the dependency of the degree of saturation on the suction, we employ the VG model along with a soil‐water characteristic curve, which determines a functional form of permeability called the Mualem model. Hencky's hyperelastic model and the Drucker‐Prager
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Analysis of laterally loaded floating piles using a refined Tajimi model Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-24 Changjie Zheng, George Kouretzis, Xuanming Ding
This paper presents a novel mathematical model for the analysis of laterally loaded floating piles embedded in a homogeneous soil layer of finite thickness. The governing equations of the soil surrounding the pile are established by treating soil as a Tajimi‐type continuum, and their solution yields a closed‐form expression that provides the lateral force developing to resist pile deflection. Accordingly
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A coupled finite difference‐spectral boundary integral method with applications to fluid diffusion in fault structures Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-24 Yuhan Wang, Elías Rafn Heimisson
Fluid migration in geological materials, a subject of great interest in various geophysical applications, has been interpreted through multiple numerical methods. Taking advantage of both a volume‐based method and a boundary integral method, we innovate a hybrid spectral‐boundary‐integral and finite‐difference method (SBI‐FDM) to describe the fluid injection and propagation in the fault structure.
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Numerical modelling of thermal jet assisted rock cutting with double PDC cutters Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-24 Timo Saksala
Preconditioning of rock for drilling operations is a potential method to facilitate the mechanical breakage and mitigate the tool wear. This paper numerically investigates one such preconditioning technique, namely, the thermal jet assisted rock cutting. For this end, a numerical method for solving the governing thermo‐mechanical problem is developed and validated. The continuum approach is chosen
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A general analytical solution for axisymmetric electro‐osmotic consolidation of unsaturated soil with semi‐permeable boundary Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-18 Xudong Zhao, Junjun Ni, Yang Liu, Wenhui Gong
This study proposes a closed‐form solution for axisymmetric electro‐osmotic consolidation of unsaturated soil under semi‐permeable boundary conditions. The governing equations are formulated to allow for vertical and radial flows of liquid and air phases. The techniques of eigenfunction expansion and Laplace transformation are employed to develop the exact solution for excess pore‐air (EPAP) and pore‐water
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An integrated EOS, pore‐crush, strength and damage model framework for near‐field ground‐shock Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-15 Kane C. Bennett, Alyson M. Stahl, Thomas R. Canfield, Garrett G. Euler
An integrated Equation of State (EOS) and strength/pore‐crush/damage model framework is provided for modeling near to source (near‐field) ground‐shock response, where large deformations and pressures necessitate coupling EOS with pressure‐dependent plastic yield and damage. Nonlinear pressure‐dependence of strength up to high‐pressures is combined with a Modified Cam‐Clay‐like cap‐plasticity model
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Probabilistic assessment of existing shield tunnel longitudinal responses to tunnelling Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-12 Rongzhu Liang, Zhiwei Zhang, Jin Wu, Zhongchao Li, Shian Cao, Wenbing Wu
This paper proposes a probabilistic‐based framework to assess the failure probability of the existing shield tunnel owing to undercrossing tunnelling. A novel deterministic model using the two‐phase analysis method is presented to evaluate the longitudinal behaviours of the in‐service shield tunnel. First, the tunnelling‐induced settlement is estimated using the Loganathan and Poulos’ method; second
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Large‐strain consolidation of vacuum preloading combined with partially penetrating prefabricated vertical drains Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-12 Wei Guo, You Zhou, Liqiang Sun, Huihuang Jiang, Ruiqing Lang, Hao Chen, Yuxiao Ren
A system of vacuum preloading combined with partially penetrating prefabricated vertical drains (PP‐PVDs) is an effective solution for promoting the consolidation of the dredged marine clay. However, a significant and traditionally challenging‐to‐predict amount of deformation or settlement occurs. Therefore, it is necessary to introduce a three‐dimensional large‐strain consolidation model to consider
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A bi‐fidelity inverse analysis method for deep excavations considering three‐dimensional effects Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-12 Yuanqin Tao, Sunjuexu Pan, Honglei Sun, Yuanqiang Cai, Ge Zhang, Miaojun Sun
Inverse analysis methods are commonly used in braced excavations for improved deformation predictions. This paper proposes a bi‐fidelity ensemble randomized maximum likelihood (BF‐EnRML) method for efficient inverse analyses of deep excavations considering the three‐dimensional effects. The bi‐fidelity (BF) model is developed by the low‐fidelity model (i.e., two‐dimensional finite element model, 2D
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A novel stability equation for the estimation of the factor of safety for homogeneous dry finite slopes Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-11 Naloan Coutinho Sampa, Joshua Schorr
This paper introduces a novel closed‐form equation (surrogate model) for approximating the Morgenstern–Price estimate of the factor of safety of homogeneous dry finite slopes with circular failure surfaces. Unlike typically used methods, the proposed equation does not require the definition of a critical failure surface, splitting the soil mass into slices, or the iterative reduction of soil resistance
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Study on the formation mechanism and preventive measure of pot cover effect for subgrade in seasonal frozen soil area under freeze–thaw cycles Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-10 Ruiling Zhang, Yaling Chou, Mingli Zhang, Hongbo Liu
The presence of an impervious cover layer inhibits the free evaporation of moisture in the soil during seasonal freeze–thaw cycles, leading to a phenomenon known as the pot cover effect. This can result in severe frost heave issues in airport runways, highway subgrades, railway subgrades, and other similar infrastructure. In this study, a disease investigation was conducted at a gas transmission station
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Variability and loss of uniqueness of numerical solutions in FEM×DEM modeling with second gradient enhancement Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-10 Trung‐Kien Nguyen, Thanh‐Trung Vo, Nhu H. T. Nguyen, Gaël Combe
In the last decade, a new multi‐scale FEM×DEM approach has been developed using Finite Element Method (FEM) coupled with Discrete Element Method (DEM) as a constitutive law to account for the specificities of the mechanical behavior of granular materials. In FEM×DEM model, a DEM calculation is performed on a particle assembly (volume element—VE) at each Gauss point. Recent publications have demonstrated
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Numerical modelling of diaphragm wall construction Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-08 Maria Kmeid, Géraldine Casaux‐Ginestet, Gilles Escadeillas, Julie Armengaud
Diaphragm walls are rectangular shaped cast in place deep foundations. There are two critical phenomena occurring, according to which the final quality can be affected: bentonite suspension exfiltration and concrete placement. Some imperfections seem to appear recurrently on the surface of the final wall. The defects are known as shadowing pathologies. The main reasons can be attributed to the dual
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Mapped material point method for large deformation problems with sharp gradients and its application to soil‐structure interactions Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-08 Yidong Zhao, Minchen Li, Chenfanfu Jiang, Jinhyun Choo
The material point method (MPM) is often applied to large deformation problems that involve sharp gradients in the solution field. Representative examples in geomechanics are interactions between soils and various “structures” such as foundations, penetrometers, and machines, where the displacement fields exhibit sharp gradients around the soil‐structure interfaces. Such sharp gradients should be captured
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Three‐dimensional stability analysis for a deep‐buried tunnel roof considering soil stratum strength nonlinearity Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-05 Jingshu Xu, Xinrui Wang, Ruotong Wang, Xiuli Du
A three‐dimensional (3D) collapse mechanism was employed in this work to investigate the roof stability of deep‐buried cylindrical tunnels in soil considering strength nonlinearity. Based on the kinematic approach of limit analysis, three tunnel roof stability measures, namely, the stability number, the required support pressure, and the factor of safety solutions were derived to provide quantitative
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Research on calculation model for ultimate bearing capacity of tensile type anchor cables and the shape of internal fracture surface in anchorage segment Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-04 Qingyang Ren, Xin Meng, Bin Chen, Songqiang Xiao, Honghua Jin, Shan Mou, Zhongyao Li
The generalized model and parameter equation for the internal fracture surface of tensile type anchor cable anchorage section are constructed, and the calculation model of ultimate bearing capacity is derived based on the principle of limit equilibrium. The shape of the internal fracture surface in the anchorage section and the expression of its parameter equation are experimentally studied, and the
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An activation mechanism for cyclic degradation of clays in bounding surface plasticity Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-04 Francesca Palmieri, Mahdi Taiebat
During undrained cyclic loading, clayey soils experience substantial stiffness and strength degradation when subjected to shear amplitudes exceeding a critical threshold. This paper presents an enhanced bounding surface rate‐independent plasticity model, an evolution of the previous SANICLAY model, tailored to capture this specific behavior during cyclic loading. A distinguishing feature of the proposed
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Stochastic assessment of 3‐D tunnels in near‐fault ground motion using modified domain reduction method Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-01 Bhavesh Banjare, Gauri Ranjan Krishna Chand Avatar
A robust assessment of tunnels due to uncertainties present in soil and ground motion properties can affect the dynamic response of these structures. In this paper, a stochastic analysis considering an aleatory variability in shear velocity Vs by performing Monte Carlo simulations and assessing its influence on underground tunnels. To numerically assess the response of the soil‐tunnel system to near‐fault
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Geotechnical analysis involving strain localization of overconsolidated soils based on unified hardening model with hardening variable updated by a composite scheme Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-04-01 Jianbin Tang, Xi Chen, Liusheng Cui, Zhe Xu, Guoqiang Liu
Strain localization simulation of overconsolidated soils with high overconsolidation ratio (OCR) has been a long‐standing challenge. Some critical state soil models, including the modified Cam‐clay (MCC) model, have been widely applied, but they may not predict the shear dilatancy of overconsolidated soils well in some cases. Hence, the unified hardening (UH) model, which may be viewed as a generalized
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Peridynamic modeling of seepage in multiscale fractured rigid porous media Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-03-22 Zhuang Cai, Heng Zhang, Zhiyuan Li, Dan Huang
The numerical simulation of seepage in fractured porous media holds significant relevance for subsurface energy development. The presence of fractures at various scales profoundly influences the hydraulic properties of porous media during seepage. A peridynamic (PD)‐based frame is proposed for the seepage problem analysis of multiscale fractured porous media, in which micro‐fractures are implicitly
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Hydro‐mechanically coupled CEL analyses with effective contact stresses Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-03-20 Patrick Staubach
The coupled Eulerian–Lagrangian (CEL) method implemented in Abaqus is an established tool for modelling large deformations in numerical geomechanics. As shown in previous work, it can be extended to a hydro‐mechanically coupled scheme by exploiting the similarity of the heat balance equation to the mass balance equation of fluids. However, the distinction between effective and total contact stresses
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Multi‐porous extension of anisotropic poroelasticity: Linkage with micromechanics Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-03-19 Filip P. Adamus, David Healy, Philip G. Meredith, Thomas M. Mitchell
We attempt to formalise the relationship between the poroelasticity theory and the effective medium theory of micromechanics. The assumptions of these two approaches vary, but both can be linked by considering the undrained response of a material; and that is the main focus of the paper. To analyse the linkage between poroelasticity and micromechanics, we do not limit ourselves to the original theory
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Multi‐porous extension of anisotropic poroelasticity: Consolidation and related coefficients Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-03-19 Filip P. Adamus, David Healy, Philip G. Meredith, Thomas M. Mitchell, Ashley Stanton‐Yonge
We propose the generalization of the anisotropic poroelasticity theory. At a large scale, a medium is viewed as quasi‐static, which is the original assumption of Biot. At a smaller scale, we distinguish different sets of pores or fractures that are characterized by various fluid pressures, which is the original poroelastic extension of Aifantis. In consequence, both instantaneous and time‐dependent
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A MPM Lagrangian‐Eulerian hydrocode for simulating buried explosions in transversely isotropic geomaterials Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-03-14 Mian Xiao, WaiChing Sun
Shock waves in geological materials are characterized by a sudden release of rapidly expanding gas, liquid, and solid particles. These shock waves may occur due to explosive volcanic eruptions or be artificially triggered. In fact, underground explosions have often been used as an engineering solution for large‐scale excavation, stimulating oil and gas recovery, creating cavities for underground waste
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Analytical solution for buried pipeline deformation induced by normal and reverse fault considering structural joint influence Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-03-13 Zhiguo Zhang, Jiawei Feng, Zhengguo Zhu, Qihua Zhao, Yutao Pan
Previous studies take less account of analytical solution analysis for buried pipeline under the action of active fault. Furthermore, current theoretical studies of fault‐pipeline interactions generally treat the structure as continuous pipeline, with less attention given to the effect of joints. This paper provides an analytical method to estimate the deformation and internal force of jointed pipelines
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Revisiting the face stability of rock tunnels in the Hoek–Brown strength criterion with tension cutoff Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-03-11 Junhao Zhong, Siau Chen Chian, Hui Chen, Chuantan Hou, Xiaoli Yang
In this work, the three‐dimensional stability of deep tunnel faces is evaluated in rock masses characterized by the generalized Hoek–Brown (H–B) criterion from the perspective of the limit analysis theorem. Considering that underground engineering is gradually developing towards larger burial depths and larger sizes, and the tensile strength of rocks is usually overestimated, the concept of tension
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Cover Image, Volume 48, Issue 5 Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-03-07 Jiujiang Wu, Yi Zhang, Yan Li, Hua Wen, Lijuan Wang
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Impact of soft minerals on crack propagation in crystalline rocks under uniaxial compression: A grain‐based numerical investigation Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-03-06 Yu Zhou, Wenjun Lv, Bo Li, Qinyuan Liang
Varying external conditions in the metallogenetic process of crystalline rocks contribute to the complex mineral and textural characteristics, rendering the mechanical properties highly heterogeneous at the mineral scale. This research focused on the influences of minerals with relatively low strength and stiffness (soft minerals) in crystalline rocks on their cracking behavior. A particle‐based discrete
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The consolidation behavior of layered fractional viscoelastic soils considering groundwater Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-03-06 Zhi Yong Ai, Zi Kun Ye, Ming Jing Jiang, Qing Song Lu
This paper investigates the consolidation behavior of multi‐layered viscoelastic soils considering groundwater. First, the fractional Merchant viscoelastic model is introduced to describe the behavior of multi‐layered viscoelastic soils considering groundwater. Later, the governing equations are extended to a viscoelastic medium by virtue of the elastic‐viscoelastic corresponding principle in the Laplace–Hankel
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Analytical solution for one‐dimensional thaw consolidation model with double moving boundaries Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-03-02 Tao Han, Yang Zhou, Guang‐si Zhao, Meng‐meng Lu
A one‐dimensional thaw consolidation model considering the density change from pore ice to pore water is established, and the model describes a special type of moving boundary problem with double moving boundaries. An analytical solution for the model under a time‐varying external load is developed using certain form of superposition principle and the similarity type of general solution. Some known
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Interpreting correlations in stress‐dependent permeability, porosity, and compressibility of rocks: A viewpoint from finite strain theory Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-03-02 Luyu Wang, Yanjun Zhang
Characteristics of stress‐dependent properties of rocks are commonly described by empirical laws. It is crucial to establish a universal law that connects rock properties with stress. The present study focuses on exploring the correlations among permeability, porosity, and compressibility observed in experiments. To achieve this, we propose a novel finite strain‐based dual‐component (FS‐DC) model,
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A nonlinear optimization method for calibration of large‐scale deep cement mixing in very soft clay deep excavation Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-28 Thanh Sang To, Hoang Le Minh, Thien Quoc Huynh, Samir Khatir, Magd Abdel Wahab, Thanh Cuong‐Le
This work proposes a novel technique to conduct back‐analysis of lateral displacement of deep cement mixing (DCM) columns in deep excavation construction. For the first time, we propose a process to investigate both soil and underground structure end‐to‐end automatically. The novel technique is a complex combination of three crucial factors: (1) a nature‐inspired optimization algorithm (O), (2) a three‐dimensional
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Block preconditioning strategies for generalized continuum models with micropolar and nonlocal damage formulations Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-20 Nasser Alkmim, Peter Gamnitzer, Matthias Neuner, Günter Hofstetter
In this work, preconditioning strategies are developed in the context of generalized continuum formulations used to regularize multifield models for simulating localized failure of quasi-brittle materials. Specifically, a micropolar continuum extended by a nonlocal damage formulation is considered for regularizing both, shear dominated failure and tensile cracking. For such models, additional microrotation
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Analyzing cyclic shear behavior at the sand–rough concrete interface: An experimental and DEM study across varying displacement amplitudes Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-20 Shixun Zhang, Feiyu Liu, Weixiang Zeng, Mengjie Ying
Pile foundations frequently endure dynamic loads, necessitating an in-depth examination of the cyclic shear properties at the pile–soil interface. This study involved a series of cyclic direct shear (CDS) tests conducted on sand and concrete with irregular surface, utilizing varying displacement amplitudes (1, 3, 6, and 10 mm) and joint roughness coefficients (0.4, 5.8, 9.5, 12.8, and 16.7). Discrete
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Modeling and coupling analysis of enhanced coalbed methane recovery by gas injection Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-20 Junxiang Zhang, Yanling Jiang, Bo Li, Junjie Guo, Weiyong Lu, Lina Qu
Enhanced coalbed methane (ECBM) recovery by gas injection is regarded as a feasible method for ECBM recovery. To investigate the mechanism of CH4 displacement by N2 injection, a series of physical experiments were conducted in the laboratory under different N2 injection pressures. The experimental results showed a continuous increase in the N2 volume fraction and a decrease in the CH4 volume fraction
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Analytical solution for consolidation of unsaturated composite foundation improved by permeable and impermeable columns considering depth-dependent initial stress Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-19 Aifang Qin, Yuxiang Peng, Jiaming Gong, Lianghua Jiang
The combination of permeable and impermeable columns is commonly employed to enhance the stability of natural ground and expedite the consolidation process while effectively reducing foundation settlement. This study presents a comprehensive investigation of the consolidation characteristics of unsaturated composite foundations (USCF) using various methods. Firstly, a mathematical model is developed
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Cover Image, Volume 48, Issue 4 Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-13 Kejie Zhai, Hongyuan Fang, Niannian Wang, Bin Li, Jiaxiu Dong, Binghan Xue
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Semi-analytical solution for double-layered elliptical cylindrical foundation model improved by prefabricated vertical drains Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-15 Xudong Zhao, Nanning Guo, Wenzhao Cao, Wenhui Gong, Yang Liu
This work proposes a semi-analytical solution for a double-layered elliptical cylindrical soft foundation improved by prefabricated vertical drains. The governing equations, continuity conditions are boundary conditions in the elliptical cylindrical system are introduced first. The Laplace transform is employed to convert the time variable t in partial differential equations into the Laplace complex
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Rheological consolidation analysis of saturated clay ground under cyclic loading based on the fractional order Kelvin model Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-15 Lian Wang, Hui Chen, Shengwei Liu, Yunyan Yu
Based on Biot porous medium theory, considering the coupled reaction of soil skeleton rheology and pore pressure dissipation, the present work investigates the dynamic consolidation characteristics of saturated clay ground under cyclic loading. First, the rheological behavior of the soil skeleton was described by the fractional order Kelvin model. The dynamic consolidation governing equations for the
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Simplified method for evaluating tunnel response induced by a new tunnel excavation underneath Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-15 Guohui Feng, Changjie Xu, Zhi Ding, Luju Liang, Yujie Li, Minliang Chi
To estimate the tunnel response induced by a new tunnel excavation underneath, theoretical solutions are proposed in this study. The overlying tunnel is idealized as an infinite Timoshenko beam resting on the Kerr foundation model, then the vertical force balance equation is established. The unloading stress can be expressed as Fourier cosine series and a theoretical solution can be derived. The effectiveness
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A novel unresolved/semi-resolved CFD-DEM coupling method with dynamic unstructured mesh Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-15 Jin-Hui He, Ming-Guang Li, Jin-Jian Chen
The greatest challenge when performing large deformation simulations using the CFD-DEM coupling method lies in the dynamical update of the fluid meshes. To address this problem, a novel CFD-DEM coupling method integrated with the dynamic unstructured grid is proposed in this work. The mesh initialization and reconstruction are performed by the Constrained Delaunay triangulation (CDT) implemented by
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Slope stability analysis with a hypoplastic constitutive model: Investigating a stochastic anisotropy model and a hydro-mechanical coupled simulation Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-15 Yang Xue, Fasheng Miao, Shun Wang, Yang Tang, Yiping Wu, Daniel Dias
A reliable constitutive model is essential for accurately predicting slope deformation in numerical analysis, which includes assessing slope stability as an integral component. However, calculating slope stability in numerical models can be challenging due to complex boundary conditions and advanced constitutive models, especially when probabilistic and hydro-mechanical coupled simulations are required
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A computational dual-porosity approach for the coupled hydro-mechanical analysis of fractured porous media Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-14 Amir R. Khoei, Mahtab Taghvaei
Dual-porosity simulation is one of the most used and efficient approaches in modeling fractured porous media. The performance of this approach is highly dependent on the accuracy of the definition of matrix-fracture transfer shape factor. In this paper, a two-step computational algorithm is developed to enhance the accuracy of the dual-porosity method in modeling large-scale deformable porous media
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Multiscale modeling of granular dynamics on flowslide triggering and runout Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-13 Ming Yang, Giuseppe Buscarnera
A hierarchical multiscale modeling framework is proposed to simulate flowslide triggering and runout. It couples a system-scale sliding-consolidation model (SCM) resolving hydro-mechanical feedbacks within a flowslide with a local-scale solver based on the discrete element method (DEM) replicating the sand deformation response in the liquefied regime. This coupling allows for the simulation of a seamless
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3D analytical modeling of moving-loading induced pile-group behavior in stratified cross-anisotropic poroelastic water-saturated soils based on two stage theory Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-12 Shuai Yang, Mincai Jia
The aim of this paper is to propose a two-stage theory-based analytical method for the dynamic performance of pile groups in layered poroelastic saturated cross-anisotropic soils induced by moving loadings. Among them, the free-field vibrational analysis of saturated soils is performed by the analytical element-layer approach (ALEA) and Fourier transformation. Based on the free-field response, the
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Identification of geotechnical units in soil exploration through principal component analysis and clustering Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-12 Oscar San Roman Iturbide, Eduardo Botero Jaramillo
Obtaining accurate information on soil characteristics is essential for large-scale construction projects. Geotechnical exploration methods are commonly used to obtain information on soil characteristics. However, integrating the characteristics obtained through different exploration methods can be challenging. To address this problem, this study proposes the use of Principal Component Analysis (PCA)
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A triple-microstructure hydro-mechanical constitutive damage model for compacted MX80 bentonite pellet/powder mixture Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-09 Jin-Wen Yang, Yu-jun Cui, Nadia Mokni, Hao Wang
A triple-microstructure hydro-mechanical constitutive damage model was proposed to describe the hydro-mechanical behaviour of MX80 bentonite pellet/powder mixture, based on the results from a series of suction-controlled oedometer tests and microstructure observations. Emphasis was put on the pellet damage behaviour. The model parameters were determined essentially based on these results. The model
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Semi-analytical solution for ultimate bearing capacity of smooth and rough circular foundations on rock considering three-dimensional strength Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-06 Haohua Chen, Hehua Zhu, Lianyang Zhang
This paper proposes a semi-analytical solution for the ultimate bearing capacity qu of both smooth and rough circular shallow foundations on rock mass. Specifically, a three-dimensional (3D) Hoek–Brown (HB) is adopted, in conjunction with equilibrium equations under axisymmetric conditions, to derive the governing equations. The method of characteristics is utilized to solve the stress and failure
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Sequential formulation of all-way coupled finite strain thermoporomechanics for largely deformable gas hydrate deposits Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-05 Jihoon Kim, Joo Yong Lee
We develop a numerically stable sequential formulation of thermoporomechanics for largely deformable gas hydrate deposits, extended from the fixed stress split of infinitesimal transformation. Constitutive equations are based on the total Lagrangian approach for both flow and geomechanics, including dynamic full tensor permeability and thermal conductivity updated from the deformation gradient. For
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An investigation of fracture modes around a spherical cavity for understanding outburst propagation mechanism Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-02-01 Jingyu Shi, Qingdong Qu, Baotang Shen
Outburst of coal and gas is a major hazard in underground coal mining where coal seam gas content/pressure is high. A cone-shaped cavity is often observed in the coal seam after bursting, implying the likely mechanical structure being formed during outburst propagation. Although the mechanism for outburst initiation and propagation is very complex, mining-induced fracturing and damage of the coal material
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A precise modeling method of three-dimensional discrete fracture network based on rectangular joint model Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-01-31 Jingyu Kang, Xiaodong Fu, Qian Sheng, Jian Chen, Kai Wu, Xing Wang
As the weak structure and main seepage channel of rock mass, the discrete fracture network (DFN) has a significant influence on the physical and mechanical properties of rock mass. In this paper, based on the rectangular joint model, two algorithms are proposed to realize the precise modeling of the DFN in any polyhedron. First, the equivalence of DFN modeling with the rectangular joint model and the
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A new cube movement test for verification of simulations of contact processes of blocks of different size in geological hazards Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-01-28 Xinquan Wang, Chun Feng, Olaf Lahayne, Yiming Zhang, Herbert A. Mang, Bernhard L. A. Pichler
In many geological hazards, such as landslides, a large number of irregular blocks start moving. Their interaction on the way down renders prediction of disaster scopes difficult. To study this process and to provide a novel method for validation and calibration of numerical tools for its simulation, a cube movement test is designed. The goal of this research is to obtain patterns of movement of cubes
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Variation of negative vacuum pressure in vertical drains with time and depth under variable well resistance Int. J. Numer. Anal. Methods Geomech. (IF 4.0) Pub Date : 2024-01-26 Chuanxun Li, Ziwei Guo, Peng Wang
Most solutions for the large strain nonlinear consolidation of soils with vertical drains are based on the assumption that the negative vacuum pressure only depends on the depth. In response to the shortcomings of this assumption, a large strain nonlinear consolidation model of soils with vertical drains under vacuum preloading is developed by considering the time-and depth-dependent well resistance