某坡前悬臂式支挡基坑开挖失稳案例分析  

Study on excavation instability of cantilever retaining foundation pit in front of a slope

作　　者：徐传召 闫建文[2] 张博 Xu Chuanzhao;Yan Jianwen;Zhang Bo(China Jikan Research Institute of Engineering Investigations and Design, Co., Ltd., Xi’an 710043, China;Xi’an University of Technology, Xi’an 710043, China;Xi’an Urban Village(shanty town) Reconstruction and Construction Project Supervision Center, Xi’an 710043, China)

机构地区：[1]机械工业勘察设计研究院有限公司,陕西西安710043 [2]西安理工大学,陕西西安710048 [3]西安市城中村(棚户区)改造建设工程监管中心,陕西西安710043

出　　处：《山西建筑》2019年第7期104-106,共3页Shanxi Architecture

摘　　要：对边坡前悬臂式支挡的基坑土体开挖导致的坡体和基坑坑壁失稳过程进行分析,建立滑坡体理论计算模型,通过理论计算分析基坑支挡结构受力状态,导出基坑开挖深度与基坑支护结构极限状态关系的公式,得出基坑支护结构失稳破坏的理论开挖深度为21. 45 m。综合滑坡后的现场勘查数据资料,此次基坑支护结构失稳的主要原因为滑体内部地下水的渗流作用以及实际滑动范围在抗滑桩后更远处产生的滑坡推力远大于两级支挡间的滑坡推力。The instability process of slope and foundation pit wall caused by excavation of foundation pit soil with cantilever retaining in front of slope is analyzed. Based on the theoretical calculation model of landslide body, the stress state of foundation pit retaining structure is analyzed through theoretical calculation, and the formula of the relationship between the excavation depth of foundation pit and the ultimate state of foundation pit supporting structure is derived. The theoretical excavation depth of instability failure of foundation pit supporting structure is obtained to be 21.45 m. Based on the field survey data after the landslide, the main reasons for the instability of the foundation pit support structure are the seepage of groundwater inside the sliding body and the fact that the actual sliding range is further behind the anti-slide pile, and the landslide thrust generated is far greater than that between the two levels of support.

关 键 词：基坑失稳 排桩支护 滑坡 受力分析 

分 类 号：TU753[建筑科学—建筑技术科学]