地下水基坑预应力锚杆复合土钉支护的稳定性  

Stability analysis of compound soil nail wall of pre-stressed bolt in foundation pit considering groundwater

作　　者：赵杰[1] 邓林艳 刘道勇[1] 

机构地区：[1]大连大学土木工程技术研究与开发中心,大连116622

出　　处：《辽宁工程技术大学学报（自然科学版）》2015年第7期826-831,共6页Journal of Liaoning Technical University (Natural Science)

基　　金：辽宁省教育厅一般项目(2012-0102517);大连市科学技术基金(2010J21DW013)

摘　　要：为研究预应力锚杆复合土钉支护体系参数中土钉长度、倾斜角度、锚杆锚固段长度对基坑稳定性的影响,采用有限元方法,考虑地下水影响,建立基坑数值分析模型,通过强度折减法,研究预应力锚杆复合土钉支护与普通土钉支护在稳定性方面的差异.研究结果表明:预应力锚杆复合土钉支护土钉长度超过10 m时,对基坑稳定性影响效果显著;复合土钉支护土钉倾角由0°到15°改变时对基坑稳定性影响较大;锚固段长度的改变对基坑稳定性影响并不显著,当锚杆总长度及预应力值一定的情况下,存在锚固段与自由段长度的最优分配,使得锚杆施力最为合理,基坑最为安全.This paper uses finite element method, establishes basic model ofpre-stressed bolt of compound soil nail wall in deep foundation pit by strength reduction method when consider the influence of groundwater, and studies the effect on the stability of deep foundation caused by length of soil nail, angle of inclination, anchoring depth of bolt in the system of compound soil nail wall ofpre-stressed bolt. Analysis result shows that compound soil nail wall of pre-stressed bolt has significant effects on stability of deep foundation pit when length of soil nail is more than 10m; compound soil nail wall has great influence when its dip angle changing is from 0°to 15°; there is no significant influence on the stability of foundation pit when anchoring depth changes, and there will be an optimum allocation of length between anchorage section and free period which makes the application of force of rock bolt most reasonable and foundation pit safest on the condition that the total length of the bolt and the value of prestress are certain.

关 键 词：预应力锚杆 复合土钉支护 强度折减 安全系数:稳定性分析 

分 类 号：TU476[建筑科学—结构工程]