某混凝土灌注桩支护基坑抗滑稳定性分析  

Numerical simulation for sliding stability of some foundation pit with supporting of bored concrete piles

作　　者：王畅 李璐璐 李守巨[2] Wang Chang;Li Lulu;Li Shouju(Dalian Haiyang Fishing Engineering Plan and Design Company Limited,Dalian 116024,China;Department of Engineering Mechanics,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连海阳渔业工程规划设计研究有限公司,辽宁大连116024 [2]大连理工大学工程力学系,辽宁大连116024

出　　处：《山西建筑》2022年第3期83-85,共3页Shanxi Architecture

基　　金：国家重点基础研究发展计划资助项目(2015CB057804)。

摘　　要：基于极限平衡理论,数值模拟了混凝土灌注桩支护基坑抗滑稳定性问题。数值模拟结果表明,在所有计算工况下,滑弧的出口均通过开挖垂直面与基坑底板的交点。分析了灌注桩抗剪承载力对基坑抗滑稳定性的影响,数值模拟研究结果表明,当没有混凝土灌注桩支护时,基坑边坡是不安全的。随着混凝土灌注桩抗剪承载力的增加,基坑的安全系数增大。当考虑降雨工况R_(U)=0.5,基坑抗滑安全系数从原来的5.01降到了3.65,与不考虑降雨工况相对比,安全系数降低了27.1%。Based on limited balance theory,the sliding stability of foundation pit with supporting of bored concrete piles is simulated.The investigation shows that the outlets of sliding surface in all calculating cases are through the cross point between excavating surface and bottom of foundation pit.The influences of shear boring ability of bored concrete piles on the sliding stability of foundation pit are analyzed.The numerical simulation results show that when there is no concrete cast-in-place pile support,the slope of the foundation pit is unsafe.The safety factor of foundation pit will increase with increasing boring ability of bored concrete piles.When the rainfall case R_(U)=0.5 is considered,the safety factor of the sliding stability of foundation pit decreases to 3.65 from original 5.01.By comparing to ignoring the rainfall case,the safety factor of the sliding stability of foundation pit decreases 27.1%.

关 键 词：基坑 混凝土灌注桩 抗滑安全系数 降雨工况 

分 类 号：TU441.35[建筑科学—岩土工程]