岩土工程开挖模拟的非局部软化模型  

A NON-LOCAL SOFTENING MODEL AND ITS APPLICATION TO ENGINEERING EXCAVATION

作　　者：冯吉利[1] 温科伟 田晓燕 陈至达[1] 

机构地区：[1]中国矿业大学,北京100083 [2]深圳市勘察测绘院

出　　处：《工程力学》1999年第6期36-43, ,共8页Engineering Mechanics

基　　金：国家自然科学基金!19632030

摘　　要：基于非线性几何场论，建立了含有天然缺陷的岩土材料非局部连续模型、变分方程及相应的实时更新拖带系大变形有限元数值模型，设计了这一模型的数值卷积算法。对工程材料特别是岩土工程的地下开挖进行的数值结果表明，非局部连续模型描述变形局部化问题是适当的，物性方程包含材料特征尺度对于带缺陷体材料应变软化和损伤的分析是必要的。A non-local continuum model for strain-softening or damage of geo-materials withdefects is derived based on nonlinear geometry field theory. Plastic strain or damage is representedby a non-local voriable in the model. Variational equations, numerical convolved integrationalgorithm of the model are also presented The numerical simulations show that the model involvedwith the characteristic size, is able to analyze softening or damage of materials with defects as wellas the deformation localization of geo-technical engineering excavation.

关 键 词：非局部模型 变形局部化 应变软化 大变形 数值卷积 岩土工程开挖模拟 

分 类 号：TU45[建筑科学—岩土工程] TU753.1[建筑科学—土工工程]