隧道工作井深基坑管涌事故分析及处理技术  

Analysis of and Treatment Technologies for a Piping Accident in the Deep Foundation Pit of a Shield Tunnel

作　　者：杨擎[1] 刘毅[1] 王勇 唐晓鹏 余村[1] 

机构地区：[1]中交第二航务工程局有限公司,武汉430040 [2]中交二航局第三工程有限公司,镇江212018

出　　处：《现代隧道技术》2015年第4期184-189,200,共7页Modern Tunnelling Technology

基　　金：江苏省交通厅科技项目(2011Y22)

摘　　要：在深基坑施工过程中,因降水或围护结构施工存在缺陷而引起的基坑管涌事故时有发生。若不能及时处理事故或处理技术不当将严重影响基坑的施工安全,甚至导致基坑报废和危及周边环境安全,造成重大的损失。文章以南京纬三路过江通道工程N线南岸盾构工作井施工为例,结合理论计算和现场调查,分析了基坑施工过程中出现管涌事故的原因,并对常规基坑管涌事故处理技术进行了分析比较,最终选择了以注浆堵漏为主,辅以高压旋喷桩封堵的处理方案,采用该方案成功解决了深基坑管涌问题,确保了工程顺利进行。Piping in deep foundation pits as a result of unsuitable dewatering or improper construction of an enclosing structure happens occasionally and severely affects the safety of construction.This can even lead to the foundation pit being out of service and can endanger the surroundings if such an accident is not treated quickly and properly, causing a great loss. Using the construction of a shield shaft on the south bank of line N in the Nanjing Weisan Road river-crossing tunnel as an example, and based on theoretical calculations and field surveys, the cause of a piping accident that occurred during foundation pit construction is analyzed and a comparison is made between the conventional treatment technologies for piping accidents in foundation pits.The selected final treatment measures include grouting and water blocking assisted by a high-pressure jet-grouted pile, which successfully resolved the problem and ensured smooth construction.

关 键 词：深基坑 管涌 涌砂 注浆堵漏 

分 类 号：TU753[建筑科学—建筑技术科学]