Improved slope safety analysis by new Druker-Prager type criterion

作     者：朱俊高 彭凯 J.F.Shao 刘汉龙 

作者机构：Key Laboratory of Geo-mechanics and Embankment Engineering of Ministry of EducationHohai University Geotechnical Research InstituteHohai University Laboratoire de Mécanique de LilleUMR CNRS 8107Equipe Mécanique des Géomatériaux CohérentsPolytech'LilleCité Scientifique59655 Villeneuve d'AscqFrance 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2012年第19卷第4期

页      面：1132-1137页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Project(2010B14814) supported by the Fundamental Research Funds for the Central Universities of China Project(200801133) supported by the Ministry of Water Resources of China for Public Welfare Profession Project(50809023) supported by the National Natural Science Foundation of China 

主　　题：yield criterion non-associated flow rule dilatancy angle plastic potential function 

摘      要：Based on Mohr-Coulomb （M-C） criterion, the parameters of Druker-Prager （D-P） criterion for geomaterial were determined under non-associated flow rule, and thus a new D-P type criterion was presented. Two assumptions were employed during the derivation： 1） principal strains by M-C model and D-P model are equal, and 2） the material is under plane strain condition. Based on the analysis of the surface on rt plane, it is found that the proposed D-P type criterion is better than the D-P criterion with M-C circumscribed circle or M-C inscribed circle, and is applicable for stress Lode angle less than zero. By comparing the predicted results with the test data of sand under plane strain condition and other D-P criteria, the proposed criterion is verified and agrees well with the test data, which is further proved to be better than other D--P type criteria in certain range of Lode angle. The criterion was compiled into a finite difference package FLAC3D by user-subroutine, and was used to analyze the stability of a slope by strength reduction method. The predicted slope safety factor from the proposed criterion agrees well with that by Spencer method, and it is more accurate than that from classic D-P criteria.