A new numerical model of ring shear tester for shear band soil considering friction-induced thermal pressurization

作     者：ZHAO Neng-hao SONG Kun ZHANG Rong-tang YI Qing-lin ZHAO Neng-hao;SONG Kun;ZHANG Rong-tang;YI Qing-lin

作者机构：School of Civil Engineering and ArchitectureWuhan Polytechnic UniversityWuhan 430023China Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University)Ministry of EducationYichang 443002China 

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

年 卷 期：2022年第19卷第11期

页      面：3302-3313页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0303[法学-社会学] 081401[工学-岩土工程] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0705[理学-地理学] 0815[工学-水利工程] 0816[工学-测绘科学与技术] 0706[理学-大气科学] 0813[工学-建筑学] 0704[理学-天文学] 0814[工学-土木工程] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）] 

基　　金：financed by the Research Foundation of Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University),Ministry of Education(Grant No.2020KDZ05) the National Natural Science Foundation of China(Grant Nos.42077239,41702378) 

主　　题：Ring shear model Discrete element method THM coupling Frictional heating Thermal pressurization 

摘      要：In this study,a new numerical model of ring shear tester for shear band soil of landslide was *** special feature of this model is that it considers the mechanism of friction-induced thermal pressurization,which is potentially an important cause of high-speed catastrophic *** key to the construction of this numerical ring shear model is to realize the THM(thermo-hydro-mechanical)dynamic coupling of soil particles,which includes the processes of frictional heating,thermal pressurization,and strength softening during shearing of solid *** of these are completed by using discrete element *** on this new model,the characteristics of shear stress change with shear displacement,as well as the variation of temperature and pore pressure in the specimen,are studied at shear rates of 0.055 m/s,0.06 m/s,0.109 m/s and 1.09 m/s,*** results show that the peak strength and residual strength of specimen are significantly reduced when the mechanism of frictioninduced thermal pressurization is *** greater the shear rate is,the higher the temperature as well as the pore pressure *** effect of shear rate on the shear strength is *** simulation results demonstrate that this model can effectively simulate the mechanism of friction-induced thermal pressurization of shear band soil during ring shear process,and the shear strength softening in the *** new numerical ring shear model established in this study is of great significance for studying the dynamic mechanism of high-speed catastrophic landslides.