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Numerical Investigation on Mesoscopic Damage Evolution and Localization Behaviors of Rock

XU Tao~1, YU Shi-hai~2, WANG Shu-hong~1, TANG Chun-an~1 (1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110004, China; 2. Faculty of Science,PLA University of Science and Technology, Nanjing 211101, China. )  
Heterogeneous rocks in uniaxial compression was numerically simulated to investigate their damage evolution and localization behaviors occurred in rock failure process using RFPA~(2D) code. The numerical simulations showed that the heterogeneity of rocks and structural size of rock specimen affect greatly the damage localization patterns of rock specimen and that there are mainly three damage localization patterns in rock failure under compression, i.e., parallel shear bands, single shear bands and conjugate shear bands. The remarkable nonlinearity of deformation combined with the occurrence of shear bands is mainly due to the coalescence and slippage of cracks, while elastic snap-back occurs beyond the shear bands. In addition, the post-peak response portion of stress-strain curve depends mainly on the deformation of the structural effect, and the damage localization just means that the descending portion of the stress-strain curve of specimen is size-dependent. So, the stress-strain curve of rock can not be regarded as a pure material property.
【Fund】: 国家自然科学基金资助项目(50374020;50134040;50204003)
【CateGory Index】: TU451
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