Numerical investigations of the failure mechanism evolution of rock-like disc specimens containing unfilled or filled flaws  

作　　者：Tian WANG Jian WANG Sheng JIANG Jiahe ZHANG 

机构地区：[1]College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China [2]School of Civil Engineering,The University of Sydney,Sydney,NSW 2006,Australia

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2023年第1期64-79,共16页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：This work is supported in part by the National Natural Science Foundation of China(No.51779084)。

摘　　要：The mechanical responses and ultimate failure patterns of rocks are associated with the failure mechanism evolution.In this study,smoothed particle hydrodynamics(SPH)method with the mixed-mode failure model is proposed to probe into failure mechanism evolutions for disc specimens upon loading.The tensile damage model and the Drucker-Prager model are used to calculate the tensile failure and shear failure of the material,respectively.It is concluded that for flaw-unfilled disc specimens,the crack coalescence mechanism in the rock bridge area is affected by the flaw inclination angle and the material property.Considering disc specimens with filled flaws,the incremental rate of tensile damage grows more rapidly when the disc and filling material have a closer ratio of tensile strength to cohesion,which makes the entire specimen response greater brittleness.Furthermore,with the increasing non-uniformity of filling distribution,the incremental rate of tensile-activated damage decreases and the disc specimen performs more ductile.Besides,the influence of the fillings is greater when the flaw inclination angle is approaching 45°.It is proved that the proposed SPH method can be used to simulate the failure mechanism evolution of rocks,which lays a foundation for the study of more complex rock failure.

关 键 词：Smoothed particle hydrodynamics(SPH) Mixed-mode failure model Failure mechanism evolution Crack coalescence Filling distribution 

分 类 号：TU45[建筑科学—岩土工程]