Nonlinear empirical failure criterion for rocks under triaxial compression  

作　　者：Hongtao Liu Zhou Han Zijun Han Zihan Chen Qinyu Liu Hongkai Zhang Rongguang Zhang Linfeng Guo 

机构地区：[1]School of Energy&Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China [2]China National Coal Association,Beijing 100010,China

出　　处：《International Journal of Mining Science and Technology》2024年第3期351-369,共19页矿业科学技术学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52004289 and U22A20165);the Fundamental Research Funds for the Central Universities(No.2022XJNY01)。

摘　　要：Based on existing triaxial compression experimental data,a new empirical failure criterion with wide applicability was proposed considering hydrostatic pressure,second stress invariance,and maximum shear stress.Four fitting evaluation indicators were used to verify the consistency of the new failure criterion,and the differences with the other 6 failure criteria were discussed.The characteristics of the new failure criteria in the principal stress space were finally analyzed.The results indicate that(1)the new failure criterion exhibits strong predictive ability for triaxial experiments and has good applicability for both intact and jointed rocks;(2)the influence of hydrostatic pressure on the failure surface exhibits a non-linear trend,and different hydrostatic pressure also exhibits different distribution patterns on the deviatoric stress plane,with a distribution characteristic pattern of hexagonal snowflake-regular hexagon.The maximum shear stress has a torsional effect on the new criterion,in the three-dimensional failure surface.The parameters a and b of the rock have an impact on the failure surface morphology of the new criterion function on the offset surface.

关 键 词：surface. CRITERION HYDROSTATIC 

分 类 号：TD313[矿业工程—矿井建设]