软土地区某基坑事故的应急处理和加固措施分析  

Analysis and reinforcement measures of foundation pit accidents in soft soil areas

作　　者：段行雨 叶凡 李守庆 DUAN Hangyu;YE Fan;LI Shouqing(Beijing Institute of Geology for Mineral Resources Co.,Ltd.,Beijing 100012,China;Integrated Survey Unit of North China Geological Exploration Bureau,Yanjiao 065201,Hebei,China;Tianjin Geological Engineering Survey and Design Institute Co.,Ltd.,Tianjin 300191,China)

机构地区：[1]北京矿产地质研究院有限责任公司,北京100012 [2]天津华北地质勘查局综合普查大队,河北燕郊065201 [3]天津市地质工程勘测设计院有限公司,天津300191

出　　处：《城市地质》2024年第4期536-544,共9页Urban Geology

摘　　要：为了有效降低软土地区基坑工程的事故发生率,并在事故突发后能够迅速且科学地采取应急措施,以天津市某典型软土区域发生的基坑事故为分析案例,探讨该基坑连续两次事故的具体成因,对应急加固措施实施效果进行了分析评估。案例分析表明:无内支撑或锚拉结构的支护结构软土基坑实际变形值通常大于计算值,需增加安全储备以控制实际变形;在达到一定深度后,悬臂桩支护结构的变形随着基坑深度的增加而急剧增大,抗风险能力相对较差;坑内支撑能有效降低基坑变形,可以作为悬臂结构的有效应急处理措施。In order to effectively reduce the occurrence of accidents in soft soil areas of foundation pit projects,and to take emergency measures quickly and scientifically after an accident,this study selects typical foundation pit accidents in a soft soil area of Tianjin City as a case study.The causes of two consecutive accidents in the foundation pit are analyzed,and systematic evaluation is carried out of the actual effects of the emergency reinforcement measures taken.The case study shows that:the actual deformation value of soft soil foundation pit without internal support or anchor pulling structure is usually larger than the pre-calculated value.It is necessary to increase the safety reserve to control the actual deformation.The deformation of the cantilever pile support structure increases dramatically with the increasing depths of the foundation pit after a certain depth threshold is reached,and the risk-resisting ability is relatively poor.In-pit support can reduce the deformation of the foundation pit,and can be used as an effective emergency response for the cantilever structure.

关 键 词：软土基坑事故 应急处理 加固措施 悬臂支护结构 内支撑 

分 类 号：TU753[建筑科学—建筑技术科学]