| 基于上限定理的城市建筑基坑开挖条件分析 |
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| 引用本文： | 吴永,何思明,张晓曦.基于上限定理的城市建筑基坑开挖条件分析[J].兰州大学学报(自然科学版),2011,47(1). |
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| 作者姓名： | 吴永 何思明 张晓曦 |
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| 作者单位： | 中国科学院水利部成都山地灾害与环境研究所山地灾害与地表过程重点实验室,成都,610041 |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划)项目，四川省科技计划项目 |
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| 摘 要： | 在模型化临近建筑荷载为条形附加应力的基础上,借助极限分析上限定理,从能量角度定义了开挖基坑边坡的稳定性,阐明其失稳破坏机理.继而借助算例,分析了不同临近荷载条件下开挖基坑的稳定性特征和条件,给出了超前支护桩基坑开挖的优化设计.结果表明:基坑边坡稳定性取决于自身重力、临近建筑荷载和超前支护桩抗力等外力功率与坡体内能耗散功率的相对关系;支护桩设计抗力越大、邻近建筑荷载越小且离开挖点越远、开挖土体力学性质越好,则基坑越稳定,对应其潜在滑面位置也不断向基坑边坡内侧移动.
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| 关 键 词： | 城市基坑 上限定理 临近建筑荷载 稳定性分析 超前支护桩 |
Analysis of excavation conditions of urban foundation pit based on the upper bound theorem |
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| WU Yong,HE Si-ming,ZHANG Xiao-xi.Analysis of excavation conditions of urban foundation pit based on the upper bound theorem[J].Journal of Lanzhou University(Natural Science),2011,47(1). |
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| Authors: | WU Yong HE Si-ming ZHANG Xiao-xi |
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| Institution: | WU Yong,HE Si-ming,ZHANG Xiao-xi Key Laboratory of Mountain Hazards and Surface Process,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China |
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| Abstract: | By modelling the adjacent building load as the strip load and taking the upper bound theorem as a measure, the slope safety was defined from the perspective of energy and the failure mechanism of foundation pit was studied. Then the characteristics and conditions of pit slope stability under different actions of adjacent building load were analyzed with an example. The results show that the pit slope stability depends on the relative work rate done by the external force and the internal energy dissipation. ... |
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| Keywords: | urban foundation pit upper bound theorem adjacent building load stability analysis pre-reinforced pile |
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