| 各向异性和非均质黏土粗糙地基承载力上限计算 |
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| 引用本文： | 杨峰,赵炼恒,阳军生.各向异性和非均质黏土粗糙地基承载力上限计算[J].岩土力学,2010,31(9):2958-2966. |
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| 作者姓名： | 杨峰 赵炼恒 阳军生 |
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| 作者单位： | 中南大学,土木建筑学院,长沙410075 |
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| 基金项目： | 教育部新世纪优秀人才支持计划项目 |
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| 摘 要： | 通过构建一种网格状多刚性块破坏机制，利用上限法研究了黏土地基各向异性和非均质对粗糙条形基础地基承载力的影响。该破坏机制允许滑动面和速度矢量沿破坏区域过渡区的径向和切向发生变化，形成了更为精确的破坏机制和塑性流动速度场。根据上限定理得到各向异性和非均质性黏土上条形基础极限承载力的目标函数，将其转化为非线性规划问题，并通过编程对该计算模型进行求解。与已有研究成果对比分析表明，两者具有较好一致性，且优于现有同类方法。文中亦探讨了黏土地基非均质、各向异性以及其他相关参数对地基承载力的影响。
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| 关 键 词： | 地基承载力 粗糙条形基础 黏土地基 非均质 各向异性 极限分析上限法 |
| 收稿时间： | 2009-01-12 |
Upper bound ultimate bearing capacity of rough footings on anisotropic and nonhomogeneous clays |
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| YANG Feng,ZHAO Lian-heng,YANG Jun-sheng.Upper bound ultimate bearing capacity of rough footings on anisotropic and nonhomogeneous clays[J].Rock and Soil Mechanics,2010,31(9):2958-2966. |
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| Authors: | YANG Feng ZHAO Lian-heng YANG Jun-sheng |
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| Institution: | School of Civil and Architectural Engineering, Central South University, Changsha 410075, China |
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| Abstract: | The upper bound ultimate bearing capacity of shallow rough footing on anisotropic and nonhomogeneous clays has been studied. A slip failure mechanism with mesh-like rigid blocks system has been constructed, in which the velocities changes on radial and tangent directions in transition area are allowable. Thus the more accurate failure modes and plastic velocity field are formed. The objective functions of bearing capacity factor on anisotropic and nonhomogeneous clays were obtained based on upper bound theorem; and the bearing capacity problems were transformed as a nonlinear optimizing problem. And the computer programming was compiled. From the numerical results and comparative analysis, it can be seen that the solutions presented in this paper compared reasonably well with the results presented in the existing literatures; and the proposed method gives better results than other methods. At last, the parameter analysis has been performed to investigate their influences on bearing capacity of footings on anisotropic and nonhomogeneous clays. |
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| Keywords: | ultimate bearing capacity rough strip footing clay ground nonhomogeneous anisotropy upper bound limit analysis |
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