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Mechanical response analysis of disintegrated carbonaceous mudstone based on discrete element method

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Abstract

The paper aims to study the mechanical characteristics of disintegrated carbonaceous mudstone in a triaxial stress state from a micro-perspective of particles. Based on the discrete element method (DEM), a spherical-polymer (SP) model that includes three different types of the particles (triangle-like, rectangle-like, and sphere) was proposed and combined the error diagram with R2 to analyze the difference between the SP model and Ball–Ball (BB) model. Meanwhile, a sensitive analysis of micro-mechanical characteristics was carried out, which quantitatively described the sensitivity of different parameters according to stress–strain curves. The processes of deformation and failure for the disintegrated carbonaceous mudstone were finally analyzed based on the displacement diagram of the particle according to the energy theory. The results suggest that the SP model could better reflect the mechanical characteristics of disintegrated carbonaceous mudstone, for the SP models, the correlation coefficient (R2) range was larger than the BB model. From the sensitivity analysis of parameters, the decreasing rate of initial deformation modulus was 56–66% as the stiffness ratio was modified when fixing other factors. The peak strength correlated well with the tensile-shear strength ratio, stiffness ratio, and friction coefficient. The modification of abnormal-shaped particles’ volume fraction ratio could affect the peak shear strength significantly. For the disintegrated carbonaceous mudstone, the processes of deformation and failure were discussed by energy transference which particle elements go from a low-energy state to a high-energy state.

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Funding

This paper was funded by the National Natural Science Foundation of China (Grant Nos. 51838001, 51878070, 52078067, 52078066), funded by the Youth Scientific and Technological Innovation Talents of Hunan Province (No. 2020RC306), funded by the Research and Development Projects in Key Fields of Hunan Province, China (No. 2019SK2171), funded by the Outstanding Innovative Youth Training Program of Changsha city (No. kq1905043), funded by the National Natural Science Youth Foundation of China (No. 42207204), funded by the "Double First-class" International Cooperation and Expansion Program for Scientific Research of Changsha University of Science and Technology (No. 2019IC04), and funded by the College Students Innovation and Entrepreneurship Program of China (No. 202120536003) and the Open Fund of Key Laboratory of Bridge Engineering Safety Control by Department of Education (Changsha University of Science and Technology) (No. 15KB01).

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Zeng, L., Yu, JL., Wen, W. et al. Mechanical response analysis of disintegrated carbonaceous mudstone based on discrete element method. Comp. Part. Mech. (2024). https://doi.org/10.1007/s40571-023-00711-w

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