Continuous-discontinuous element method for three-dimensional thermal cracking of rocks  

作　　者：Wen Nie Junlin Wang Chun Feng Yiming Zhang 

机构地区：[1]School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin,300401,China [2]Institute of Mechanics,Chinese Academy of Sciences,Beijing,100190,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2023年第11期2917-2929,共13页岩石力学与岩土工程学报（英文版）

基　　金：the financial support from the Natural Science Foundation of Hebei Province(Grant No.E2020050012);the National Natural Science Foundation of China(NSFC)(Grant No.52178324);the National Key Research and Development Project of China,the Ministry of Science and Technology of China(Grant No.2018YFC1505504).

摘　　要：Thermal cracking of rocks can significantly affect the durability of underground structures in engineering practices such as geothermal energy extraction,storage of nuclear waste and tunnelling in freezeethaw cycle induced areas.It is a scenario of strong coupled thermomechanical process involving discontinuity behaviours of rocks.In this context,a numerical model was proposed to investigate the thermal cracking of rocks,in a framework of the continuous-discontinuous element method(CDEM)for efficiently capturing the initiation and propagation of multiple cracks.A simplex integration strategy was adopted to account for the influences of temperature-dependent material properties.Several benchmark tests were considered and the obtained results were compared with analytical solutions and numerical results from the literature.The results show that the fracture degree of the cases when considering temperature-dependent material parameters had 10%differences approximately compared with the cases with constant parameters.

关 键 词：Rock thermal cracking Continuous-discontinuous element Simplex integration Temperature dependence Numerical simulation 

分 类 号：TG1[金属学及工艺—金属学]