［摘要］根据应力扩散理论，将锚拉桩后的土体分为应力扩散影响区及非应力影响区，进而将预应力锚拉桩的土压力传递方式分为两部分：楔体内的土压力直接传递到锚头，与锚头间形成自平衡体系；楔体外的土压力通过桩身结构再传递到锚头。利用静力平衡方程，导出作用在桩上的土应力强度，分析影响桩身土压力分布规律的相关因素，并结合一工程案例的测试结果，与理论分析得到的成果进行对比分析，验证提出的土压力计算模式的正确性。
［关键词］预应力锚拉桩；土压力计算模式；土楔体；扩散角；自平衡体系
中图分类号：TU473文献标识码：A文章编号：1002-848X(2011)10-0102-03
Study on calculation mode of soil pressure for pre-stressed anchor piles
Li Chengfang1,2, Ye Xiaoming1, Xiong Qidong2, Li Xin2(1 College of Civil Engineering, Chongqing University, Chongqing 400010, China; 2 Chongqing Institute of Building Research, Chongqing 400015, China)
Abstract:According to the stress diffusion theory, the soil behind the anchor pile structure was divided into the stress diffusion affected area and non stress affected area. Then soil pressure transmission mode of the pre-stressed anchor pile was divided into two parts: soil pressure produced by wedge was directly transferred to the anchor head, the soil and the anchor head formed a self-balance system; other soil pressure through the anchor pile structure was passed to the anchor head. Using the static equilibrium equations, the soil pressure intensity exerted on pile was deduced and related influencing factors of its distribution were put forward. The theoretical analysis results were compared with the results of an engineering case test, and the correctness of the soil pressure calculation mode was demonstrated.
Keywords:pre-stressed anchor pile; soil pressure calculation mode; soil wedge; diffusion angle; self-balance system
作者简介：李成芳，高级工程师，一级注册结构工程师，注册土木（岩土）工程师，Email：LCF9133@163.com。
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