顶管深基坑涌水涌砂处理技术研究  

Research on the Treatment Technology of Water and Sand Gushing in Pipe Jacking Deep Foundation Pit

作　　者：何巍伟 HE Wei-wei(The First Construction Company of CCCC Second Harbor Engineering Co.,Ltd.,Wuhan 430012,China)

机构地区：[1]中交二航局第一工程有限公司,武汉430012

出　　处：《价值工程》2025年第9期134-136,共3页Value Engineering

摘　　要：涌水涌砂是基坑工程中的一种多发事故,其主要由基坑止水结构质量缺陷、降水措施不满足要求等原因导致。以武汉赵家条220千伏电力通道土建工程顶管深基坑涌水涌砂事故为例,描述了基坑涌水涌砂事故发展过程,分析了事故发生原因,总结了现场应急处置方法及后续基坑开挖技术措施。现场实践表明:现场涌水涌砂发生后采用“土工布+倒滤管”引水堵漏,并进行石膏筑墙加固,但堵漏效果不理想,采用灌水反压防止涌水涌砂进一步发展;通过在井周增设7口真空井,有效降低了地下水位,基坑开挖过程中井壁无渗漏。The water and sand gushing is a common accident in foundation pit engineering,which is mainly caused by the defective quality of foundation pit waterproofing structure or inadequate dewatering measures.Taking the water and sand gushing in pipe jacking deep foundation pit of the Zhaojiatiao 220kV power channel project in Wuhan as an example,the development process of the accident was described,and the cause of the accident was analyzed.In addition,the on-site emergency response methods and subsequent excavation techniques were summarized.The field practice shows that the measures such as geotextile,filter tube,and gypsum masonry reinforcement cannot effectively seal the leak after the occurrence of the water and sand gushing.Therefore,the use of water injection and back pressure is adopted to prevent further development of water and sand gushing.By adding 7 vacuum wells around the well,the groundwater level is effectively reduced,and there is no leakage of the well wall during the excavation process of the foundation pit.

关 键 词：深基坑 涌水涌砂 高压旋喷桩 真空井 

分 类 号：TU74[建筑科学—建筑技术科学]