| 考虑支护结构的软土基坑抗隆起稳定上限分析 |
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| 引用本文： | 李镜培,唐耀,张飞.考虑支护结构的软土基坑抗隆起稳定上限分析[J].地下空间与工程学报,2011,7(5):1007-1012. |
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| 作者姓名： | 李镜培 唐耀 张飞 |
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| 作者单位： | 1. 同济大学 岩土及地下工程教育部重点试验室,上海 200092;2.同济大学地下建筑与工程系,上海 200092 |
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| 基金项目： | 上海市科委“科技创新行动计划”资助项目(09231200900) |
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| 摘 要： | 采用极限分析有限元方法,考虑了支护结构的影响,通过塑性流动约束条件,速度不连续约束条件以及速度边界约束条件等,形成了一个以结点速度,非负塑性应变率和引进的非负变量作为未知量的线性方程组,由能量平衡的关系建立了目标函数,运用线性规划优化算法求解线性方程组。分析了土体强度,支护结构入土深度以及支护结构极限弯矩等因素对于基坑抗隆起稳定性安全系数的影响,得出了基坑抗隆起稳定性安全系数随着支护结构入土深度和极限弯矩增加而增大的结论。通过两个算例的验算,并且与传统算法计算结果进行对比,体现出本文方法的适用性和正确性。本文的计算方法为软土地区基坑抗隆起稳定性验算提供了一个新的计算思路,具有一定工程参考价值。
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| 关 键 词： | 极限分析 软土 基坑开挖 抗隆起稳定性 上限分析 |
| 收稿时间： | 2011-06-11 |
Analysis of Stability Against Upheaval of Excavation by Upper Bound Method Considering the Retaining Wall |
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| Li Jingpei,Tang Yao,Zhang Fei.Analysis of Stability Against Upheaval of Excavation by Upper Bound Method Considering the Retaining Wall[J].Chinese Journal of Underground Space and Engineering,2011,7(5):1007-1012. |
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| Authors: | Li Jingpei Tang Yao Zhang Fei |
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| Affiliation: | 1.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2.Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | Considering the influence of the bracing structure,the limit analysis FEM is employed to establish the linear equations using plastic flow constraints,velocity discontinuous constraints and velocity boundary conditions with nodes velocities,plastic strain rates and non-negative variables as the unknown qualities.Based on the theory of energy balance,the objective function is established and the linear program is used to solve the linear equation.The influence of the un-drained strength and the depth of the ... |
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| Keywords: | limit analysis soft clay foundation pit excavation basal stability against upheaval upper bound method |
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