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Discussion of FEM Back Analysis from Instability and Strength Degradation in Subgrade Engineering

XIE Li-xin~1,LI Jian~1,DENG Jin-yu~1,YUAN Zhen~2(1.Hunan Province Freeway Manage Office,Changsha 410001 P.R.China;2.Changsha University of Science and Technology,Changsha 410076 P.R.China)  
According to the problem of failure and instability in subgrade engineering,on the basis of inhomogeneous elastic damage model,in this paper FEM back-analysis from instability-strength degradation is propose,which suggests that the material parameter obey statistical distribution and it is used to describe the inhomogeneity of material.To the same calculation model,adopt homogeneous elastic-plastic model and inhomogeneous elastic damage model separately,the results of calculation under two kinds of situations are compared,the impact of material inhomogeity on stability is analyzed.Analyzing the subgrade projects in the karst area through strength degradation,it reproduces the breaking and steadiness losing course in the subgrade engineering,the intensity parameter while losing steadilness,and has certain directive significance to the subgrade engineering.
【Fund】: 湖南省交通科技项目(2002-17);; 湖南省教育厅科学基金重点项目(01A019);; 湖南省自然科学基金项目(01JJY2041)资助
【CateGory Index】: U416.1
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