| 非饱和土弹塑性模型参数的试验确定及有限元法 |
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| 引用本文： | 陈勇,刘德富,王世梅.非饱和土弹塑性模型参数的试验确定及有限元法[J].岩土力学,2009,30(2):542-546. |
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| 作者姓名： | 陈勇 刘德富 王世梅 |
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| 作者单位： | 1. 武汉大学,水利水电学院,武汉,430072;三峡大学,三峡库区地质灾害教育部重点实验室,湖北,宜昌,443002
2. 三峡大学,三峡库区地质灾害教育部重点实验室,湖北,宜昌,443002 |
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| 基金项目： | 国家自然科学基金重点项目，国家自然科学基金面上项目 |
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| 摘 要： | 简要介绍广泛应用的非饱和土Alonso模型的原理与发展，并通过3组共7个试样的非饱和土三轴试验，得到模型的11个参数。在饱和土Cam本构关系的基础上，推导出一个基于非饱和土Alonso模型的应力-应变增量方程的计算公式，该方程与饱和土的本构方程形式相同。编制了能够考虑净应力和吸力二者对土体硬化规律影响的有限元程序，从而为非饱和土弹塑性计算提供一条途径，便于进一步应用于实际工程。
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| 关 键 词： | 非饱和土 Alonso模型 硬化规律 有限元分析 |
| 收稿时间： | 2007-04-10 |
Elastoplastic constitutive model parameters of unsaturated soils and its finite element methods |
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| CHEN Yong,LIU De-fu,WANG Shi-mei.Elastoplastic constitutive model parameters of unsaturated soils and its finite element methods[J].Rock and Soil Mechanics,2009,30(2):542-546. |
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| Authors: | CHEN Yong LIU De-fu WANG Shi-mei |
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| Institution: | 1. School of Water Resources and Hydropower, Wuhan University, Wuhan 430072, China; 2. Key Laboratory of Geological Hazards of Three Gorges Reservoir Area of Ministry of Education, China Three Gorges University, Yichang 443002, China |
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| Abstract: | An elastoplastic critical state-based framework for describing the constitutive behavior of unsaturated soils are presented and briefly discussed. Base on the model, eleven model parameters were ascertained after seven laboratory tests on unsaturated soils. Then a revised elastoplastic incremental stiffness matrix for unsaturated soil is deducted; and it has a same form with that of saturated soils. Finally, a program has been workout which can consider the affection of mean stress and suction on soil hardening laws. As a consequence, a new method is proposed for analyzing the elastoplastic problem of unsaturated soil. |
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| Keywords: | unsaturated soils Alonso’s model hardening laws finite element analysis |
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