基于三维土拱效应的预应力锚拉桩锚头间距确定

›› 2011, Vol. 32 ›› Issue (3): 825-830.

基于三维土拱效应的预应力锚拉桩锚头间距确定

李成芳^1,2，叶晓明¹，熊启东²，吴德伦¹

1. 重庆大学土木工程学院，重庆 400010；2. 重庆市建筑科学研究院，重庆 400015

收稿日期:2010-02-20 出版日期:2011-03-10 发布日期:2011-03-21
作者简介:李成芳，男，1973年生，博士研究生，高级工程师，主要从事地基基础方面的研究工作。
基金资助:
重庆市科技攻关项目（No. CSTC 2010AC0109）。

Determination of suitable anchorhead spacing of prestressed anchor pile based on three-dimensional soil arching

LI Cheng-fang ^1,2, YE Xiao-ming¹, XIONG Qi-dong², WU De-lun ¹

1.College of Civil Engineering, Chongqing University, Chongqing 400010, China; 2.Chongqing Institute of Building Research, Chongqing 400015, China

Received:2010-02-20 Online:2011-03-10 Published:2011-03-21

摘要/Abstract

摘要：

讨论了传统预应力锚拉桩支护结构荷载传递路径存在的不足，根据其受力特性，首次提出了基于三维土拱效应的力学计算模型，并对该模型的正确性进行了验证。分析了土拱的形状、土拱的拱高，进而提出了该模型的数学表达式。同时对三维土拱的形成条件进行了论证，建立了形成土拱的静力平衡条件及土的强度条件，在此基础上确立了锚头间距的控制方程，分析了抗剪强度参数c、? 及桩板后土压力q的对锚头间距的影响。最后，将上述分析成果应用于一工程案例，节约了工程造价效果。

关键词: 预应力锚拉桩, 拱高, 锚头间距, 三维土拱

Abstract:

The existing problem of load transmission path of traditional prestressed anchor piles is discussed; and a mechanical calculation model is first proposed based on three-dimensional soil arching effect by its mechanics property; and the correctness of the model is verified. Then the soil arch shape and arch rise are analyzed; and further the mathematical expression of the model is presented. Meanwhile, three-dimensional soil arch formation conditions are demonstrated; static equilibrium and the strength of the conditions are established. On this basis, anchorhead spacing control equation is deduced and the influences of shear strength parameters c and ? and soil pressure q on anchorhead spacing are analyzed. Finally, a project example is given so as to verify saving project cost.

Key words: prestressed anchor pile, arch rise, anchorhead spacing, three-dimensional soil arching

中图分类号:

TU 473.2

李成芳，叶晓明，熊启东，吴德伦. 基于三维土拱效应的预应力锚拉桩锚头间距确定[J]. , 2011, 32(3): 825-830.

LI Cheng-fang, YE Xiao-ming, XIONG Qi-dong, WU De-lun. Determination of suitable anchorhead spacing of prestressed anchor pile based on three-dimensional soil arching[J]. , 2011, 32(3): 825-830.

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