深厚淤泥软土地区某基坑坍塌事故分析及处理  

Analysis and treatment for collapse accident of a foundation pit in deep and thick sullage soft-soil area

作　　者：周越洲 杨慎银 王嵩 许名鑫 周汉香 ZHOU Yuezhou;YANG Shenyin;WANG Song;XU Mingxin;ZHOU Hanxiang(Architectural Design&Research Institute of SCUT Co.,Ltd.,Guangzhou 510641,China)

机构地区：[1]华南理工大学建筑设计研究院有限公司,广州510641

出　　处：《建筑结构》2024年第15期128-135,共8页Building Structure

摘　　要：位于深厚淤泥软土地区的某基坑支护采用钻孔排桩加钢筋混凝土内支撑体系,坑内被动区采用格构式搅拌桩进行加固,在局部开挖到底时基坑发生坍塌。模拟基坑开挖过程支护结构的受力及变形情况,结合基坑坍塌过程的表现,对基坑坍塌事故进行分析,并提出基坑加固方案。基坑加固方案充分利用未破坏的支护结构构件,重新构建坍塌范围的支护结构,并对承载力不足的构件进行补强加固;利用土的时空效应和施工过程信息化管理,跳挖施工基坑周边的回填反压土台。基坑加固后的监测数据表明,支护结构变形满足设计要求。The drilled row-piles and reinforced concrete internal bracing system were used for supporting a foundation pit located in deep and thick sullage soft-soil area.The lattice mixing piles were used for strengthening the passive area of the foundation pit.The foundation pit collapsed when the local excavation reached the bottom of the foundation pit.The internal force and deformation of the supporting structure during the excavation process of the foundation pit were simulated.Combining with the performance of the collapse process,the collapse accident of the foundation pit was analyzed,and the strengthening scheme of the foundation pit was proposed.In the strengthening scheme of the foundation pit,the undamaged members in the supporting structure of the foundation pit were fully utilized,and the supporting structure in the collapsed area was re-constructed,and the members with insufficient bearing capacity were strengthened.Using the time-space effect of soil and information management of the construction process,the skip excavation construction was conducted on the backfill reverse pressure platform around the foundation pit.The monitoring datas after strengthening of the foundation pit show that the deformation of the supporting structure meets the design requirements.

关 键 词：软土地区 基坑支护 内支撑 基坑坍塌 事故分析 基坑加固 信息化施工 基坑监测 

分 类 号：TU462[建筑科学—结构工程]