| 简化接触模型的月壤离散元数值分析 |
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| 引用本文： | 郑敏,蒋明镜,申志福.简化接触模型的月壤离散元数值分析[J].岩土力学,2011,32(Z1):766-0771. |
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| 作者姓名： | 郑敏 蒋明镜 申志福 |
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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 |
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| 基金项目： | 国家杰出青年科学基金项目(No.51025932);国家自然科学基金项目(No.10972158) |
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| 摘 要： | 根据月壤其颗粒级配可归类于粉质砂土。针对真实月壤所处的环境（无水、低重力场、低气压等），将Perko等2001年提出的月壤颗粒间的范德华力植入离散元分析软件PFC2D中，模拟了刚性边界下加入该模型与未加该模型试样的双轴压缩试验，研究了颗粒间范德华力对试样的宏观力学特性与微观颗粒接触的影响。结果表明，颗粒间的范德华力对试样的抗剪强度、体应变以及颗粒平均配位数都有显著的影响
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| 关 键 词： | 月壤 接触模型 离散单元法 范德华力 |
| 收稿时间： | 2010-12-23 |
Discrete element numerical analysis of lunar soil with a simplified contact model |
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| ZHENG Min,JIANG Ming-jing,SHEN Zhi-fu.Discrete element numerical analysis of lunar soil with a simplified contact model[J].Rock and Soil Mechanics,2011,32(Z1):766-0771. |
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| Authors: | ZHENG Min JIANG Ming-jing SHEN Zhi-fu |
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| Institution: | 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 |
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| Abstract: | Lunar soil can be classified as silty sand according to its particle size distribution. The Lunar environment is quite different from on the earth (such as with no water, low gravitational fields, very low atmospheric pressure, etc.). The Van der Waals forces between soil particles proposed by Perko et al. (2001) is taken into consideration in the simplified lunar siol contact model, which is then implanted into PFC2D. With this model several biaxial compression tests are simulated by the discrete element method (DEM). The effects of Van der Waals forces on the mechanical behavior of samples and the average coordination number of samples are then studied. The results show that the Van der Waals force is a very important factor in controlling the peak strength; and it will lead to extensive dilatancy of the samples. |
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| Keywords: | lunar soil contact model discrete element method Van der Waals forces |
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