STUDY AND APPLICATION OF YIELD CRITERIA TO ROCK AND SOIL
SU Ji-hong1 , WANG Zheng-xing1 , REN Wen-min1 , YANG Zhen-yu2, ZHOU Jun-sheng2 (1. Dept. of Engineering Mechanics, Tsinghua University, Beijing 100084, P.R.China; 2. JianDa Road & Bridge Consultation Company, Beijing 100101, P.R.China)
This paper addresses the linear Mohr-Coulomb yield criterion and Drucker-Prager yield criterion, and the relation among the linear Mohr-Coulomb criteria in material mechanics and rock mechanics. The geometrical characteristics of the linear Mohr-Coulomb yield surface and the Drucker-Prager yield surface are described. The linear Mohr-Coulomb criterion is approximated using the Drucker-Prager criterion in three ways and the resultant differences are highlighted. An example is given in which the Drucker-Prager criterion is used to fit the linear Mohr-Coulomb criterion.