Numerical modelling of post-failure behaviors of coal specimens  

作　　者：Ajeet Yadav Bhaskara Behera Gauri Shankar Prasad Singh Sanjay Kumar Sharma 

机构地区：[1]Department of Mining Engineering,Indian Institute of Technology(Banaras Hindu University)Varanasi,Uttar Pradesh,221005,India

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第2期514-531,共18页岩石力学与岩土工程学报（英文版）

摘　　要：A modelling approach consisting of best-fit relations to estimate the post-yield strength parameters is presented for simulating post-peak behavior beyond the point of residual strength of coal pillars having different w/h ratios.The model was developed based on back-analysis of the complete stress-strain behavior of specimens belonging to six different Indian coal seams with different w/h ratios of 0.5 e13.5.It was found that the simultaneous degradation of the cohesion and friction angle of the Mohr-Coulomb rock material characterizes the post-peak strength behavior of the rock.The resulting expressions are simplistic as they require parameters that can be easily determined using uniaxial and triaxial compression results.Eventually,the developed model was validated by simulating the triaxial tests of coal specimens with different sizes under varying confining stresses and comparing its findings with the published test results.The study showed that its implementation in the numerical model could reproduce laboratory-observed mechanical response,deformation behavior,and failure mechanism very closely.

关 键 词：Strain softening DILATANCY INTERFACE Shape effect Residual strength 

分 类 号：TU45[建筑科学—岩土工程]