| 岩土材料塑性损伤模型及拱坝的变形局部化分析 |
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| 引用本文： | 陈新,杨强,周维垣.岩土材料塑性损伤模型及拱坝的变形局部化分析[J].岩土力学,2007,28(5):865-870. |
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| 作者姓名： | 陈新 杨强 周维垣 |
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| 作者单位： | 1. 中国矿业大学(北京)力建学院,北京,100083
2. 清华大学,水利水电工程系,北京,100084 |
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| 基金项目： | 国家自然科学基金;国家重点基础研究发展计划(973计划) |
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| 摘 要： | 常规的弹塑性模型难以模拟材料破坏时由于内部损伤累积引起的变形局部化带形成过程。将岩土材料抽象为含有孔洞的球形体胞单元的集合体，采用一个标量——孔洞体积百分比来刻划单元的损伤程度，基于细观损伤力学提出了一个适用于岩土材料的塑性损伤模型。将该模型通过用户子程序嵌入到大型有限元商业软件MRAC中，研究岩土材料的局部化剪切带形成过程。采用该模型，成功地对平面应力条件下岩土材料单轴受压和单轴受拉试件的局部化破坏分别进行了数值模拟。采用该模型，对拱坝在超水载作用下的变形局部化进行了研究，数值计算结果表明，上游坝踵处最先发生变形局部化现象。
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| 关 键 词： | 岩土材料 孔洞体积百分比 塑性损伤模型 拱坝 变形局部化 |
| 文章编号： | 1000-7598-（2007）05-0865-06 |
| 收稿时间： | 2005-12-20 |
| 修稿时间： | 2005-12-20 |
An elastoplastic damage model for geomaterials and analysis of strain localizaion of arch dams |
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| CHEN Xin,YANG Qiang,ZHOU Wei-yuan.An elastoplastic damage model for geomaterials and analysis of strain localizaion of arch dams[J].Rock and Soil Mechanics,2007,28(5):865-870. |
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| Authors: | CHEN Xin YANG Qiang ZHOU Wei-yuan |
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| Institution: | 1. School of Mechanics & Civil Engineering, China University of Mining &Technology ( Beijing), Beijing 100083, China; 2. Department of Hydraulic and Hydropower Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | 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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| Keywords: | geomaterials void volume fraction damage coupled plastic model arch dam strain localization |
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