| 土体塑性各向异性的微宏观机理分析 |
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| 引用本文： | 钱建固,黄茂松.土体塑性各向异性的微宏观机理分析[J].岩土力学,2011,32(Z2):88-93. |
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| 作者姓名： | 钱建固 黄茂松 |
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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： | 国家自然科学基金资助(No.10972159,No.50825803); 上海市自然科学基金资助(No.08ZR1420100) |
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| 摘 要： | 基于微观土力学理论框架推导了宏观应力解析，将各向异性的微观机理归结为微观接触力各向异性和微观组构各向异性的两方面因素。应用基于微观理论的应力解析构建了土体各向异性强度准则，并结合既有的微、宏观试验及理论成果，研究加载条件对硬化定律的影响机理，进而揭示了变形非共轴性的微观理论基础。研究表明，着眼于微观理论机理，强度各向异性和塑性变形各向异性本质上都是微观组构各向异性的宏观表现。其中，强度各向异性起源于土体微观组构的固有各向异性，而塑性诱发各向异性依赖于塑性硬化过程中微观组构各向异性的演化规律。在比例加载条件下土体表现为等向硬化和共轴塑性，而非比例加载条件下表现为等向-运动硬化和塑性非共轴性
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| 关 键 词： | 微宏观土力学 组构 各向异性 非比例加载 非共轴 |
| 收稿时间： | 2011-04-12 |
Micro-macro mechanismic analysis of plastic anisotropy in soil |
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| QIAN Jian-gu,HUANG Mao-song.Micro-macro mechanismic analysis of plastic anisotropy in soil[J].Rock and Soil Mechanics,2011,32(Z2):88-93. |
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| Authors: | QIAN Jian-gu HUANG Mao-song |
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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: | Within the micromechanical framework,the macroscopic stress is explicitly formulated.Its deviatoric components are decomposed into two components,respectively related to the contact force anisotropy and the fabric anisotropy.A new anisotropic strength criterion is established in terms of micromechanically-based stress components.With reference to the existing micro-macroscopically experimental and theoretical investigations,this study further accounts for the effects of loading manner on hardening law,and r... |
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| Keywords: | micro-macro soil mechanics fabric anisotropy non-proportional loading non-coaxiality |
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