Phase-Field Modeling of Thermal Fracture and Shear Heating in Rocks with Degraded Thermal Conductivity Across Crack  

作　　者：Tao You Qizhi Zhu Weijian Li Jianfu Shao 

机构地区：[1]Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing,210024,China [2]Department of Environmental Informatics,Helmholtz Centre for Environmental Research-UFZ,04318,Leipzig,Germany [3]College of Civil and Transportation Engineering,Hohai University,Nanjing,210024,China [4]College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,518060,China [5]University of Lille,CNRS,Centrale Lille,LaMcube,UMR9013,F-59000,Lille,France

出　　处：《Acta Mechanica Solida Sinica》2024年第5期711-726,共16页固体力学学报（英文版）

基　　金：funding provided by the National Natural Science Foundation of China(No.12202137);TY's contribution is funded by the China and Germany Postdoctoral Exchange Program(Grant No.ZD202137).The first author(TY)would like to express his gratitude to Prof.Keita Yoshioka for reviewing this manuscript and for his invaluable feedback.

摘　　要：By incorporating two different fracture mechanisms and salient unilateral effects in rock materials,we propose a thermomechanical phase-field model to capture thermally induced fracture and shear heating in the process of rock failure.The heat conduction equation is derived,from which the plastic dissipation is treated as a heat source.We then ascertain the effect of the non-associated plastic flow on frictional dissipation and show how it improves the predictive capability of the proposed model.Taking advantage of the multiscale analysis,we propose a phase-field-dependent thermal conductivity with considering the unilateral effect of fracture.After proposing a robust algorithm for solving involved three-field coupling and damage-plasticity coupling problems,we present three numerical examples to illustrate the abilities of our proposed model in capturing various thermo-mechanically coupled behaviors.

关 键 词：PHASE-FIELD MICROMECHANICS Heat transfer Thermal conductivity degradation Shear heating 

分 类 号：O34[理学—固体力学]