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Mechanical properties and damage evolution characteristics of composite rock mass with prefabricated fractures

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Abstract

In this study, the influence of fractures on the mechanical properties and cracking behavior of composite rock mass was investigated by preparing rock-like specimens of composite rock mass with different dip angles of fractures using customized molds. The failure process of the sample was recorded using a camera, and the rock failure process analysis technology was used for quantitative investigation of the mechanical mechanism of crack evolution during the loading process of the sample. Based on the experimental results, the crack propagation and coalescence modes of fractured composite rock mass were analyzed, and the distribution laws of contact force chain and maximum principal stress during initial crack initiation were studied from the microscopic perspective. The results show that with the increase in fracture dip angle, when the fracture is located in hard rock, the peak strength of the specimen decreases first, then increases and then decreases. When the fracture is located in both soft rock and hard rock, the peak strength of the specimen is mainly controlled by the fracture in soft rock. The initial crack mainly occurs at the tip of the soft rock fracture, and then converges with the cracks developed at the end of the hard rock fracture through the interface. The crack propagation type and coalescence mode are affected by the joint action of the fracture dip angle and position. In total, eight crack propagation types and six crack coalescence modes were observed during the failure process. The maximum principal stress concentration area is distributed around the fracture and is “butterfly” type. With the increase in fracture dip angle, the maximum principal stress concentration area gets gradually deflected perpendicular to the fracture direction, and does not pass through the interface of soft and hard rocks. The existence of the interface prevents the transmission of stress to a certain extent.

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Acknowledgements

The authors greatly acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 52204137), the Natural Science Foundation of Liaoning Province (Grant No. 2022-BS-281), the Education Department Foundation of Liaoning Province (Grant Nos. LJKQZ20222317 and LJKMZ20220661), and the Outstanding Young Scientific and Technological Talents Project of Liaoning University of Science and Technology (Grant No. 2023YQ10).

Funding

The authors greatly acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 52204137), the Natural Science Foundation of Liaoning Province (Grant No. 2022-BS-281), the Education Department Foundation of Liaoning Province (Grant Nos. LJKQZ20222317 and LJKMZ20220661), and the Outstanding Young Scientific and Technological Talents Project of Liaoning University of Science and Technology (Grant No. 2023YQ10).

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ZX and JH performed substantial contributions to the conception and design of the work and revised the manuscript. HW established the numerical simulation models and finished writing the original manuscript. CL, BY and BC processed pictures and data of numerical simulation. LZ completed the laboratory test and data collation. XW designed the discussion and revised the manuscript. All authors reviewed the final manuscript and agreed to submit for publication.

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Correspondence to Zhiguo Xia.

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Wang, H., Hu, J., Xia, Z. et al. Mechanical properties and damage evolution characteristics of composite rock mass with prefabricated fractures. Comp. Part. Mech. (2024). https://doi.org/10.1007/s40571-024-00719-w

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