Numerical modeling of permeability evolution based on degradation approach during progressive failure of brittle rocks

作     者：Zhang Chunhui Yue Hongliang Zhao Quansheng Wang Laigui 

作者机构：School of Civil Engineering Hebei University of Science and Technology Shijiazhuang 050018 China School of Mechanics and Engineering Liaoning Technical University Fuxin 123000 China 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2016年第26卷第4期

页      面：535-542页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：the National Natural Science Foundation of China (Nos.51274079,51274110 and 51574139) the Natural Science Foundation of Hebei Province (No.E2013208148) 

主　　题：Hoek Brown failure criterion Dilatancy Permeability evolution Confining pressure Degradation of strength 

摘      要：The permeability evolution of rock during the progressive failure process is described. In combination with the strength degradation index, the degradation formulas of s and a, which are dependent on the plastic confining strain component, the material constants of Hock-Brown failure criterion are presented, and a modified elemental scale elastic-brittle-plastic constitutive model of rock is established. The rela- tionship between volumetric strain and permeability through tri-axial compression is investigated. Based on the above, a permeability evolution model is established. The model incorporates confining pressure- dependent degradation of strength, dilatancy and corresponding permeability evolution. The model is implemented in FLAC by the FISH function method. The permeability evolution behavior of rock is inves-tigated during the progressive failure process in a numerical case. The results show that the model is cap- able of reproducing, and allowing visualization of a range of hydro-mechanical responses of rock. The effects of confining pressure on degradation of strength, dilatancy and permeability evolution are also reflected.