基坑壁后土体脱空引起的围护结构稳定性监测与分析  

Monitoring and Analysis of Retaining Structure Stability Caused by the Soil Void Behind Foundation Pit Wall

作　　者：杨安民[1] 阳军生[1] 王俊 王树英[1] 张峥[1] YANG Anmin YANG Junsheng WANG Jun WANG Shuying ZHANG Zheng(School of Civil Engineering, Central South University, Changsha Hunan 410075, China Hunan Maglev Transportation Development Co., Ltd.,Changsha Hunan 410014, China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]湖南磁浮交通发展股份有限公司,湖南长沙410014

出　　处：《铁道建筑》2016年第9期108-111,共4页Railway Engineering

摘　　要：长沙一房建工程基坑施工过程中围护桩壁后出现土体脱空,对基坑稳定造成很大影响。通过现场监测与数值分析,探讨了壁后土体脱空现象对围护结构稳定性的影响。分析结果表明,发生壁后土体脱空现象后,围护桩的变形与受力模式均发生改变,壁后土体稳定性降低,桩顶向基坑内的水平位移增加量超过50 mm,内力峰值增加85%,安全性能显著降低。通过及时对脱空部位进行回填处理,保证了基坑稳定。During the foundation pit construction of one house-building project in Changsha,there is a soil void behind the retaining pile wall,which has a great influence on the stability of foundation pit.This paper discussed the influence of the soil void behind the wall on retaining structure stability through field monitoring and data analysis.The results showed that the deformation and stress mode of retaining pile changed after the soil void behind the wall,soil stability behind the wall decreased.The horizontal displacement increment of the pile top towards foundation pit was more than 50 mm,peak value of internal force increased by 85%,and safety performance significantly decreased.Backfilling the void position promptly could guarantee the stability of foundation pit.

关 键 词：围护结构 脱空 桩顶水平位移 内力峰值 回填 

分 类 号：U417.11[交通运输工程—道路与铁道工程]