| 基于cut-off方法刚性承台下群桩基础优化分析 |
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| 引用本文： | 梁发云,陈海兵.基于cut-off方法刚性承台下群桩基础优化分析[J].岩土力学,2011,32(Z1):61-65. |
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| 作者姓名： | 梁发云 陈海兵 |
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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： | 高等学校博士学科点专项科研基金(No.20070247017); 教育部第37批留学回国人员科研启动基金 |
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| 摘 要： | 针对刚性筏板下群桩基础优化设计问题进行分析，通过改变桩长分布来调整各桩的荷载分担，群桩分析采用基于弹性理论的积分方程方法，并通过cut-off方法来反映桩的弹塑性特性，实现群桩基础的弹塑性优化分析，改进了常规弹性分析方法的缺陷。算例分析表明，随着外荷载的不断增加，角桩首先达到极限荷载，对角桩超出极限荷载的部分进行重新分布，继而使得边桩逐渐达到极限承载状态，继续加载直至内桩也达到极限承载状态，从而引起桩筏基础的整体破坏。采用cut-off方法可以改进基础变刚度优化设计，使之与实际情况更为吻合。
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| 关 键 词： | cut-off方法 长短桩 优化分析 刚性承台 弹塑性 |
| 收稿时间： | 2011-02-22 |
Optimization analysis of group piles below rigid raft with a cut-off method |
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| LIANG Fa-yun,CHEN Hai-bing.Optimization analysis of group piles below rigid raft with a cut-off method[J].Rock and Soil Mechanics,2011,32(Z1):61-65. |
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| Authors: | LIANG Fa-yun CHEN Hai-bing |
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| Institution: | 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: | Optimization of group piles below a rigid raft is analyzed;and load carried by individual pile is adjusted by the length of pile,respectively.To analyze elastoplastic behaviour of piles,a cut-off method is adopted to limit pile capacity in the integral equation considering linear behaviour of piles;and then the optimization results are easily obtained.The analysis shows that the corner piles reached to their bearing capacity at first;and then the side piles come at their bearing capacity gradually with redi... |
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| Keywords: | cut-off method long-short piles optimization analysis rigid cap elastoplasticity |
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