An elastoplastic damage model for geomaterials and analysis of strain localizaion of arch dams

被引:0
|
作者
Chen Xin [1 ]
Yang Qiang [2 ]
Zhou Wei-yuan [2 ]
机构
[1] China Univ Min & Technol Beijing, Sch Mech & Civil Engn, Beijing 100083, Peoples R China
[2] Tsinghua Univ, Dept Hydraul & Hydropower Engn, Beijing 100084, Peoples R China
关键词
geomaterials; void volume fraction; damage coupled plastic model; arch dam; strain localization;
D O I
暂无
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Elastoplastic models can't simulate strain localization due to ductile damage evolution. A porous geomaterial is modeled as an aggregate of spherical thick-walled shells, so the damage of a representative volume element can be characterized by a scalar variable, i.e. the void volume fraction, and a coupled plastic damage model for geomaterials based on micromechanics was proposed. This model was implemented into the commercial FEM software MARC through a user subroutine, and strain localization of geomaterials was studied. Shear band formation due to void nucleation and growth were successfully simulated in a specimen of geomaterial under plane stress compression and tension by the model respectively. Shear band formation in an arch dam under overloading was studied also. It is shown that the strain localization appeared first at the heel of the arch dam.
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页码:865 / 870
页数:6
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