Numerical Simulation Study on Damage Evolution Law of Heterogeneous Rocks under Uniaxial Compression
The process of rock failure under uniaxial compression is relatively fast,and the crack propagation morphology cannot be observed with the naked eye.In order to quantitatively analyze the damage evolution law of granite under uniaxial compression,nu-merical simulation software is used to simulate the uniaxial loading process of heterogeneous granite.By simulating the number of failure units at different time steps in the model,based on the damage variable theory of effective bearing area,the damage variable of the rock is calculated,Further research on the damage law of heterogeneous granite.The research results indicate that:(1)Granite undergoes conjugate failure("X"type fracture)under numerical simulation of uniaxial compression.The initial crack initiation is an oblique crack from top right to bottom left,followed by an oblique crack from top left to bottom right,ultimately forming an"X"type conjugate fracture;(2)In the compression and elastic stages,the numerical simulation damage variable increases relatively little.In the crack development stage,the numerical simulation damage variable gradually increases with an average increase of 0.003 5.In the post peak failure stage,the numerical simulation damage variable increases sharply with an average increase of 0.035,which is consistent with the curve changes of rock time and stress.The research results can provide a new research approach for the correlation between the surface and internal crack development of heterogeneous rocks in the future,and thus provide a new research approach for rock failure warning and monitoring.
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