An extended micromechanical-based plastic damage model for understanding water effects on quasi-brittle rocks  

作　　者：Qiaojuan Yu Shigui Du Qizhi Zhu Zhanyou Luo Sili Liu Lunyang Zhao 

机构地区：[1]Institute of Rock Mechanics,Ningbo University,Ningbo 315211,China [2]Ningbo Key Laboratory of Energy Geostructure,Ningbo University,Ningbo 315211,China [3]College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China [4]College of Civil Engineering,Jiangsu Open University,Nanjing 210036,China [5]South China Institution of Geotechnical Engineering,School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China

出　　处：《International Journal of Mining Science and Technology》2024年第3期289-304,共16页矿业科学技术学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.42001053 and 42277147);the General Scientific Research Fund of Zhejiang Provincial Education Department(No.Y202352363);the University Natural Science Foundation of Jiangsu Province(No.23KJD130001)。

摘　　要：Water effects on the mechanical properties of rocks have been extensively investigated through experiments and numerical models.However,few studies have established a comprehensive link between the microscopic mechanisms of water-related micro-crack and the constitutive behaviors of rocks.In this work,we shall propose an extended micromechanical-based plastic damage model for understanding weakening effect induced by the presence of water between micro-crack’s surfaces on quasi-brittle rocks,based on the Mori-Tanaka homogenization and irreversible thermodynamics framework.Regarding the physical mechanism,water strengthens micro-crack propagation,which induces damage evolution during the pre-and post-stage,and weakens the elastic effective properties of rock matrix.After proposing a special calibration procedure for the determination of model parameters based on the laboratory compression tests,the proposed micromechanical-based model is verified by comparing the model predictions to the experimental results.The model effectively captures the mechanical behaviors of quasibrittle rocks subjected to the weakening effects of water.

关 键 词：Water MICRO-CRACK DAMAGE MICRO-MECHANICS Constitutive model Cohesive force 

分 类 号：TD313[矿业工程—矿井建设]