轴向荷载对斜桩水平承载特性影响试验及理论研究

›› 2013, Vol. 34 ›› Issue (7): 1958-1964.

轴向荷载对斜桩水平承载特性影响试验及理论研究

袁廉华^{1, 2}，陈仁朋^{1, 2}，孔令刚^{1, 2}，张浙杭³，陈云敏^{1, 2}

1. 浙江大学岩土工程研究所，杭州 310058；2. 浙江大学软弱土与环境土工教育部重点实验室，杭州 310058；3. 浙江省电力设计院，杭州 310012

收稿日期:2012-06-25 出版日期:2013-07-10 发布日期:2013-07-15
通讯作者: 陈仁朋，男，1972年生，博士，教授，主要从事土与结构相互作用及交通岩土的研究。E-mail: chenrp@zju.edu.cn E-mail: zjuadam@gmail.com
作者简介:袁廉华，男，1986年生，硕士研究生，主要从事桩基工程的研究

Test and theoretical research on influence of axial load on lateral bearing capacity of batter piles

YUAN Lian-hua^{1, 2}，CHEN Ren-peng^{1, 2}，KONG Ling-gang^{1, 2}，ZHANG Zhe-hang³，CHEN Yun-min^{1, 2}

1. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2. Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou 310058, China; 3. Zhejiang Electric Power Design Institute, Hangzhou 310012, China

Received:2012-06-25 Online:2013-07-10 Published:2013-07-15

摘要/Abstract

摘要： 斜群桩受水平荷载作用时，群桩中的基桩受到径向荷载、轴向荷载和弯矩的共同作用。为研究轴向荷载对斜桩水平承载特性的影响，完成了3根单桩以及1组1×2斜桩的大尺寸模型试验。试验结果表明：轴向拉力作用会降低斜桩的水平刚度和极限承载力；而轴向压力作用则会使其水平刚度和极限承载力提高。基于桩侧浅层土体楔形破坏假定，推导了考虑轴向荷载影响的斜桩水平极限土抗力计算公式，提出了桩侧土抗力的p-y曲线方法，并通过模型试验及现场试验验证其合理性。

关键词: 斜桩, 轴向荷载, 水平荷载, p-y曲线

Abstract: When batter pile group are under lateral load, the foundation piles in pile group are subjected to radial load, axial load and bending moment. In order to study the influence of axial load on lateral bearing capacity of batter piles, large-scale model tests of three single piles and a 1×2 batter pile group have been conducted in a larger soil tank. It is found that the upward axial force on the pile top decreases the lateral stiffness and the lateral ultimate bearing capacity of batter pile; while the downward axial force enhances the horizontal stiffness and the lateral ultimate bearing capacity of batter pile. Based on the assumption of wedge failure of the shallow soil around piles, considering the influence of axial load on piles, a formula for calculating the lateral ultimate resistance force of soil is deduced. Then, a p-y curve method for resistance force of soil around piles is proposed. Finally, the formula and the proposed p-y curve method for batter pile are verified by model tests and field tests.

Key words: batter pile, axial load, lateral load, p-y curve

中图分类号:

TU 473

袁廉华，陈仁朋，孔令刚，张浙杭，陈云敏 . 轴向荷载对斜桩水平承载特性影响试验及理论研究[J]. , 2013, 34(7): 1958-1964.

YUAN Lian-hua ，CHEN Ren-peng ，KONG Ling-gang ，ZHANG Zhe-hang ，CHEN Yun-min . Test and theoretical research on influence of axial load on lateral bearing capacity of batter piles[J]. , 2013, 34(7): 1958-1964.

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