考虑土拱效应的疏排桩支护基坑内力和变形分析

›› 2014, Vol. 35 ›› Issue (12): 3531-3540.

考虑土拱效应的疏排桩支护基坑内力和变形分析

古海东¹，杨敏²

1.浙江省交通规划设计研究院，杭州 310006；2.同济大学地下建筑与工程系，上海 100092

收稿日期:2013-07-22 出版日期:2014-12-11 发布日期:2014-12-15
作者简介:古海东，男，1983年生，博士，工程师，主要从事桩基础、深基坑与路基工程方面的研究工作。
基金资助:
国家自然科学基金项目（No. 40972179）

Analysis of internal forces and displacement of pit supporting structure with scattered row piles considering soil arching effect

GU Hai-dong¹, YANG Min²

1. Zhejiang Provincial Institute of Communications Planning Design and Research, Hangzhou 310006, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 100092, China

Received:2013-07-22 Online:2014-12-11 Published:2014-12-15

摘要/Abstract

摘要： 采用同济大学中型岩土离心机进行了2组疏排桩支护基坑的离心机模型试验，结合三维有限元数值分析探讨了采用规范方法计算疏排桩支护基坑桩身内力与变形的适宜性，并提出了考虑土拱效应的疏排桩支护基坑桩侧土压力的理论计算方法，最后建立了考虑土拱效应的疏排桩支护基坑桩身内力和变形的计算模型。研究结果表明：对于桩间距与桩径之比为2、3和8的疏排桩支护基坑，桩间土体无法形成土拱效应；对于桩间距与桩径之比为4～7的疏排桩支护基坑，桩间土拱效应明显；规范法计算得到桩身内力与变形结果要比离心机试验结果偏大，与规范方法相比，采用文中提出的计算方法计算疏排桩支护基坑桩身内力与变形更为合理。

关键词: 疏排桩, 基坑, 离心机模型试验, 土拱效应, 内力分析

Abstract: Two groups centrifuge tests of pit foundation supporting with scattered row piles are carried out by Tongji University. Combined with three-dimensional finite element numerical simulation, the suitability that the specification method is used to calculate the internal forces and displacement of pit supporting structure with scattered row piles is explored. In addition, a theoretical calculation method of earth pressure of pile considering soil arching effect is proposed. Finally, the calculation model of internal forces and displacement of scattered row piles considering soil arching effect is created. The results show that, for pit supporting structure with scattered row piles when the ratios of pile spacing and pile diameter are 2, 3 and 8, the soil between piles can’t form soil arching effect. In addition , when the ratios are 4-7, the soil arching effect between piles is obvious. The results of pile internal forces and displacement by specification method are larger than the result by centrifuge test. Furthermore, the pile internal forces and displacement of pit supporting structure with scattered row piles calculated by the proposed calculation method are more reasonable.

Key words: scattered row piles, foundation pit, centrifuge model test, soil arching effect, internal force analysis

中图分类号:

TU 431

古海东，杨敏,. 考虑土拱效应的疏排桩支护基坑内力和变形分析[J]. , 2014, 35(12): 3531-3540.

GU Hai-dong , YANG Min,. Analysis of internal forces and displacement of pit supporting structure with scattered row piles considering soil arching effect[J]. , 2014, 35(12): 3531-3540.

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