水平荷载作用下现浇X形桩桩周土体响应理论分析

›› 2013, Vol. 34 ›› Issue (12): 3377-3383.

水平荷载作用下现浇X形桩桩周土体响应理论分析

周航^{1, 2}，孔纲强^{1, 2}

1.河海大学岩土力学与堤坝工程教育部重点实验室，南京 210098；2.河海大学土木与交通学院，南京 210098

收稿日期:2012-08-27 出版日期:2013-12-10 发布日期:2013-12-19
通讯作者: 孔纲强，男，1982年生，博士，副教授，主要从事软土地基处理及桩基础方面的教学与研究工作。E-mail: gqkong1@163.com E-mail:zh4412517@163.com
作者简介:周航，男，1987年生，博士研究生，主要从事软土地基处理及桩基础方面的研究工作

Theoretical analysis of the reaction mechanism of the surrounding soil of X-section cast-in-place pile under lateral load

ZHOU Hang^{1, 2}, KONG Gang-qiang^{1, 2}

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

Received:2012-08-27 Online:2013-12-10 Published:2013-12-19

摘要/Abstract

摘要： 现浇X形桩是为了提高单位混凝土承载力性能而开发的一种新型异形横截面桩，但目前针对异形横截面桩在水平荷载作用下桩周土体力学性状的理论研究相对较少。基于保角变换的方法将X形桩孔映射到单位圆上，采用平面弹性力学的复变函数方法得到X形桩在水平荷载作用下桩周土体应力场与位移场分布的平面应变解。续而，基于文克尔地基模型，把桩周土离散为一系列独立的弹簧模型，弹簧的刚度系数采用平面应变解，然后根据欧拉-伯努利梁的挠曲线微分方程推导得到现浇X形桩在水平荷载作用下桩身的变形和内力的计算方法。通过建立的平面应变解计算普通圆形截面桩，并且与Baguelin推导的圆形截面桩在水平荷载作用下平面应变解进行对比分析，验证所建立理论方法的准确性和可靠性。最后，针对一算例进行分析，并与数值模型计算结果进行对比验证。研究结果表明，该理论方法能够较好地模拟水平荷载作用下现浇X形桩桩周土体的力学工作性状，尤其是小荷载作用条件下。

关键词: 现浇X形桩, 水平荷载, 土体位移场, 保角变换, 解析解

Abstract: X-section cast-in-place pile (XCC pile) can save concrete usage under the same pile perimeter. However, there are little relative theoretical studies focusing on the lateral load reaction mechanism of the surrounding soil of XCC pile. The XCC pile holes are mapped on the unit circle using the conformal mapping of complex function method, and the plane strain solutions of stress and displacement distribution of surrounding soil of XCC pile under lateral load calculated by plane complex variable elasticity method are obtained. Then, the surrounding soil of pile are assumed as a series of independent springs, and the stiffness coefficients of the springs can be calculated by the plane strain solution in this paper. Pile deflection and internal force of XCC pile under lateral load can be calculated by using differential equations of the Euler-Bernoulli beam. The reliability of the theoretical calculated method built in this paper is verified by comparative analysis with the plane strain solution of the circular piles under lateral load obtained by Baguelin. Finally, one example is analyzed, and the results are compared with numerical calculated results. The results show that the reaction mechanism of the surrounding soil of XCC pile under lateral load can be simulated very well by this method, especially with small lateral load condition.

Key words: X-section cast-in-place pile, lateral load, soil displacement field, conformal mapping, analytical solution

中图分类号:

TU 375

周航，孔纲强 , . 水平荷载作用下现浇X形桩桩周土体响应理论分析[J]. , 2013, 34(12): 3377-3383.

ZHOU Hang , KONG Gang-qiang , . Theoretical analysis of the reaction mechanism of the surrounding soil of X-section cast-in-place pile under lateral load[J]. , 2013, 34(12): 3377-3383.

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