Deformation and Failure Mechanism of Phyllite under the Effects of THM Coupling and Unloading

作     者：MENG Lubo LI Tianbin XU Jin CHEN Guoqing MA Hongming YIN Hongyu 

作者机构：State Key Laboratory of Geohazard Prevention and Geoenvironment ProtectionChengdu University of TechnologyChengdu 610059China School of Water Resources and HydropowerSichuan UniversityChengdu 610065China 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2012年第9卷第6期

页      面：788-797页

核心收录：

学科分类：081401[工学-岩土工程] 08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0814[工学-土木工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by National Natural Science Foundation of China (Grant No. 41102189,No. 41002110 and No. 41230635) Projects of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Grant No. SKLGP2009Z002,No. SKLGP2009Z012) Research Fund for the Doctoral Program of Higher Education of China(Grant No. 20105122110008) 

主　　题：Phyllite Mechanical characteristics Penetrability Failure mechanism Loading test Thermo-Hydraulic-Mechanics(THM) 

摘      要：Although the study of TM(Thermo Mechanics),HM(Hydraulic-Mechanics) and THM(Thermo-Hydraulic-Mechanics) coupling under a loading test have been under development,rock failure analysis under THM coupling and unloading is an emerging *** on a high temperature triaxial unloading seep test for phyllite,this paper discusses the deformation and failure mechanism of phyllites under the H M,T→H,T→M incomplete coupling model with unloading *** results indicate that the elastic modulus and initial permeability decrease and the Poisson s ratio increases with increasing temperature;the elastic modulus decreases and the Poisson s ratio and initial permeability increase with increasing water *** the unloading process,rock penetrability is small at the initial elastic deformation phase,but the penetrability increases near the end of the elastic deformation phase;mechanisms involving temperature and water pressure affect penetrability *** failure occurs from the initial thermal damage of the rock materials,splitting and softening(which is caused by pore water pressure),and the pressure difference which is formed from the loading axial pressure and unloading confining *** phyllite failure mechanism is a transtensional(tension-shearing) failure.