DEM simulation of progressive damage and permeability evolution of sandstone during direct-shearing

被引：0
|
作者：
Chen X. [1 ,2 ]
Yu F. [2 ]
Tang M. [1 ,2 ]
Xiao Y. [2 ]
Zeng P. [1 ,2 ]
Zhong Z. [1 ,2 ]
机构：
[1] State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Sichuan, Chengdu
[2] College of Environment and Civil Engineering, Chengdu University of Technology, Sichuan, Chengdu
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2024年 / 43卷
基金：
中国国家自然科学基金;
关键词：
direct-shear test; discrete element method; particle flow code; permeability evolution; progressive damage; rock mechanics;
D O I：
10.13722/j.cnki.jrme.2023.0122
中图分类号：
学科分类号：
摘要：
In order to investigate progressive damage and permeability evolution of sandstone under direct-shearing conditions,a group of numerical models based on physical experiments are established using the particle flow code in two-dimension(PFC2D). Four different levels of normal stresses are set to discuss meso-crack propagation features,energy dissipation mechanism,and permeability evolution characteristics of sandstone in the process of direct-shearing. The results show that the mesoscopic cracks gradually expanding,merging,connecting,nucleating,and finally forming an obvious macroscopic shear band,and the total number of cracks after failure increases with the increase of the normal stress. In addition,the total energy input in the pre-peak stage is mainly stored in the form of the strain energy of interparticle bonding bonds,and the dissipated energy increases rapidly in the post-peak stage. The dissipated energy is close to 40% of the total energy when the numerical rock samples fail completely. Furthermore,the permeability variation is governed by the preferred seepage channels in the rock sample,and the sudden increase of permeability is the manifestation of the transformation of“pore flow”into“fracture flow”during direct shearing process. © 2024 Academia Sinica. All rights reserved.
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页码：3161 / 3174
页数：13
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