| 荷载和水作用下结构性黄土破损规律的离散元分析 |
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| 引用本文： | 蒋明镜,胡海军.荷载和水作用下结构性黄土破损规律的离散元分析[J].岩土工程学报,2014,36(6):989-997. |
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| 作者姓名： | 蒋明镜 胡海军 |
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| 作者单位： | 1. 同济大学地下建筑与工程系,上海 200092; 2. 同济大学岩土及地下工程教育部重点实验室,上海 200092; 3. 西北农林科技大学水利与建筑工程学院,陕西 杨凌 712100 |
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| 基金项目： | 国家杰出青年科学基金项目（51025932）; 国家自然科学基金项目（51179128）; 教育部博士点基金项目（20100072110048）; 教育部长江学者和创新团队发展计划项目（IRT1029） |
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| 摘 要： | 采用离散元法（DEM）分析了增减荷和增湿作用下结构性黄土的破损规律。首先,给出了定义在离散介质上的破损参数表达式并介绍了已有代表性结构性土本构模型中破损参数的函数形式；其次,根据离散元微观测试技术获得了加减荷和增湿数值试验中破损参数的变化规律,检验了已有代表结构性土本构模型中破损规律的函数形式,给出了其与宏观量如应力和应变的函数关系,最后建议了多种应力路径和增湿路径下破损参数的计算公式,这些公式中参数较少,并且能较好地反映荷载和水作用下结构性黄土破损参数的变化规律。
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| 关 键 词： | 黄土 破损 本构模型 微观理论 离散元 |
| 收稿时间： | 2013-03-28 |
Numerical analysis of degradation evolution of structured loess under loading,unloading and wetting by discrete element method |
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| JIANG Ming-jing,HU Hai-jun.Numerical analysis of degradation evolution of structured loess under loading,unloading and wetting by discrete element method[J].Chinese Journal of Geotechnical Engineering,2014,36(6):989-997. |
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| Authors: | JIANG Ming-jing HU Hai-jun |
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| Affiliation: | 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. College of Water Resources and Architecture Engineering, Northwest A & F University, Yangling 712100, China |
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| Abstract: | The breakage parameter evaluation is analyzed for structured loess under loading, unloading and wetting by distinct element method (DEM). First, the breakage parameter is defined based on the discrete medium, and the expressions for breakage parameter in representative models for structured soils are introduced. Then the evaluation of breakage parameter for structured loess under loading, unloading and wetting is measured by the micro measurement technique of discrete element method. The relation between the breakage parameter and the macroscopic parameter such as strain or stress is presented, and the forms of formulas for the breakage parameter in representative models for structured soils are examined. Finally the formulas for calculating the breakage parameter under different stress paths and wetting paths are proposed. The parameters in these formulas are few and the formulas can predict the evaluation of breakage parameter for structured loess under loading and wetting well. |
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| Keywords: | loess breakage constitutive model microscopic theory DEM |
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