异常暴雨工况下基坑工程稳定性分析及安全保障措施研究  

Stability analysis and safety guarantee measures of foundation pit engineering under abnormal rainstorm conditions

作　　者：郭显川 刘淑芬 李洪涛 孙雅飞 刘建友 GUO Xianchuan;LIU Shufen;LI Hongtao;SUN Yafei;LIU Jianyou(Qingdao Engineering Consulting Institute,Qingdao 266035,Shandong,China;Nanchang Communications University,Nanchang 330100,Jiangxi,China;Shandong Provincial Bureau of Geology&Mineral Exploration and Development 801 Hydrogeology and Engineering Geology Brigade,Jinan 250013,Shandong,China;China Railway Engineering Consulting Group Co.,Ltd.,Beijing 100055,China)

机构地区：[1]青岛市工程咨询院,山东青岛266035 [2]南昌交通学院,江西南昌330100 [3]山东省地质矿产勘查开发局八〇一水文地质工程地质大队,山东济南250013 [4]中铁工程设计咨询集团有限公司,北京100055

出　　处：《水利水电技术（中英文）》2023年第S01期348-353,共6页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金(12345678);中国国家铁路集团有限公司科技研究计划重大课题(2019G006-A-1)。

摘　　要：近年来,异常暴雨导致的工程灾害事故时有发生,给人民的生命财产安全带来了严重威胁。基于某实际工程在暴雨工况下出现大变形事故,针对事故原因,对基坑稳定性进行分析,得到以下结论:(1)随着钢筋堆载和静水压力的增加,地下连续墙的变形增加,且地下连续墙与车站结构间存在的间隙能够放大钢筋堆载和静水压力对结构变形的不利影响。(2)通过对地下连续墙结构进行强度验算发现,随着静水压力的增大,连续墙结构会产生破坏。(3)工程事故原因为,地下连续墙与车站侧墙间存在裂隙、基坑一侧地表存在钢筋堆载、静水压力增加、地下连续墙结构发生破坏。(4)为了保障基坑在暴雨工况下的安全稳定,应当对设计进行优化,在工程施工阶段做好预防工作,同时还应当做好对工程应急处理方案。In recent years,engineering disasters and accidents caused by abnormal rainstorms occur from time to time,posing a serious threat to the safety of people′s lives and property.Based on a large deformation accident in an actual project under heavy rain conditions,the stability of the foundation pit is analyzed according to the cause of the accident,and the following conclusion are obtained:(1)With the increase of steel piling load and hydrostatic pressure,the deformation of the underground diaphragm wall increases,and the gap between the underground diaphragm wall and the station structure can amplify the adverse effects of steel bar stacking and hydrostatic pressure on structural deformation.(2)Through the strength check of the underground diaphragm wall structure,it is found that with the increase of hydrostatic pressure,the diaphragm wall structure will be damaged.(3)Through analysis,it is found that there is a crack between the underground diaphragm wall and the side wall of the station,the steel bar is stacked on the surface of the foundation pit side,the hydrostatic pressure increases,and the underground diaphragm wall structure is damaged.(4)In order to ensure the safety and stability of the foundation pit under heavy rain conditions,the design should be optimized,preventive work should be done during the construction stage,and an emergency treatment plan for the project should also be done.

关 键 词：基坑稳定 二维模型 暴雨工况 围护结构大变形 

分 类 号：U213.1[交通运输工程—道路与铁道工程]