软土地区复杂环境基坑坍塌原因分析  

Analysis on the Collapse Causes of Foundation Pit under Complex Environmental in Soft Soil Areas

作　　者：黄林伟 徐芫蕾 周焜 王光文 Huang Linwei;Xu Yuanlei;Zhou Kun;Wang Guangwen(Zhejiang Construction Engineering Quality Inspection Station Co.,Ltd.,Hangzhou 310012,P.R.China;Zhejiang Academy of Building Research&Design Co.,Ltd.,Hangzhou 310012,P.R.China)

机构地区：[1]浙江省建设工程质量检验站有限公司,杭州310012 [2]浙江省建筑科学设计研究院有限公司,杭州310012

出　　处：《地下空间与工程学报》2024年第3期1039-1050,共12页Chinese Journal of Underground Space and Engineering

摘　　要：本文以浙江杭嘉湖冲海积平原地区,紧邻既有建筑、重要管线等复杂环境条件下的某项目基坑为研究对象,基坑开挖影响深度范围内有深厚软土,分别对工程地质条件、坍塌后支护结构现状、支护结构施工质量和技术资料进行了检测调查,并结合支护结构、构件的计算分析和数值分析,研究表明:该基坑设计时阳角处支护结构选型和布置不合理,土层参数和“m值”取值不合理,基坑局部超挖和基坑支护结构的施工质量缺陷是导致基坑坍塌的原因。本文提出了基坑加固方案和在软土地区复杂环境条件下基坑的设计、施工建议。研究成果可为类似地区和环境条件下基坑的设计、施工提供参考。The thesis takes a foundation pit project,which is located in the Hangzhou-Jiaxing-Huzhou alluvial plain area of Zhejiang Province,having deep soft soil within the depth range affected by excavation and is under complex environment that is adjacent to existing buildings and significant pipelines,as its research object,and respectively conducts inspection and investigation on the aspects of its engineering geological conditions,the current status of the support structure after collapse,the construction quality of the support structure,and technical data,by combining the calculation and numerical analysis on the support structure and components.It then draws the conclusion that the reasons of the foundation pit collapse are that the selection and layout of the support structure for the external corner at the design phase are unreasonable,the soil layer parameters and the value selection of"m value"are unreasonable,and along with the partial over excavation of the foundation pit and the construction quality defects of the support structure of the foundation pit.At the last part of the thesis,it proposes reinforcement plans and design and construction suggestions for the foundation pit in soft soil areas with complex environmental conditions,which provides reference for the design and construction of foundation pits in similar regions with homogeneous environmental conditions in the future.

关 键 词：软土地区 复杂环境 基坑坍塌 大阳角 受力不平衡 

分 类 号：TU922[建筑科学—建筑设计及理论]