密排支护桩挤土位移简化计算方法  

Simplified calculation method for the soil compacting effect of the retaining pile while close-packing

作　　者：徐美娟[1] 郭玉君[2] 黄广龙[3] 

机构地区：[1]南京交通职业技术学院,江苏南京211188 [2]江苏南京地质工程勘察院,江苏南京210041 [3]南京工业大学交通学院,江苏南京210009

出　　处：《四川建筑科学研究》2013年第6期122-126,共5页Sichuan Building Science

基　　金：国家自然科学基金资助项目(50608038);南京交通职业技术学院科研基金项目(JY1212)

摘　　要：预制密排基坑支护桩沉桩时,对基坑外的建(构)筑物和基坑内的桩基础产生了不利影响,有必要研究其挤土产生的位移。基于单桩挤土位移场的解析解,推导出密排桩挤土位移计算公式,计算不同桩数时沉桩地表位移、对比不同桩数时不同深度处沉桩位移、分析不同直径桩沉桩位移变化规律。得出:随着桩径的增大,挤土水平位移和竖向位移均逐渐增大;在径向距桩距离一定时,随着桩数的增多,沉桩产生的挤土水平和竖向位移均增大;密排支护桩两侧5～8倍桩径范围是挤土位移急剧变化区,在其两侧的挤土影响范围约为1.5～2倍桩长。When the precast retaining piles of the pit were packed closely,it had adverse effect on the outer buildings and the inner pile foundation. The soil compacting effect of the piles may be studied. Based on the analytical solution for the soil compacting deformation of the single pile, the displacement formula of the close-packing piles was derived. The influences of the pile amount, depth and pile diameter on the soil compaction displacement were discussed. With the increasing of the pile diameter and pile amount, the horizontal displacement and vertical displacement increased gradually. The soil compaction displacement changed rapidly from the both sides of the close-packing piles to 5 - 8 times pile diameter distance. The influence scope of the soil compaction around the piles was 1.5 ~ 2 times pile length.

关 键 词：密排 支护桩 挤土位移 简化计算方法 

分 类 号：TU473.1[建筑科学—结构工程]