深基坑地下墙漏水引起地面沉降分析

Surface subsidence caused by water seeping through diaphragm wall of deep foundation pit

为了对地下连续墙漏水后墙后建筑物、管线的安全状态进行评估,和及时消除安全隐患提供依据,监测单位通过在墙后布设沉降观测点的方法对墙后地表沉降状况实时监测。根据多起地铁车站基坑地下连续墙漏水事故的经验与总结,分析了地墙渗漏引起墙后地表沉降的形态、影响范围、沉降量,初步分析了由此可能引发的事故,并提出预防事故的相关建议,以期为类似情况提供有价值的参考。

In order to evaluate the security of the buildings and pipelines behind the diaphragm wall where water seeps and provide the basis for eliminating the threat timely,monitoring department does the real-time monitoring of ground subsidence by setting settlement observation points behind the diaphragm wall.According to the experience and summary of some metro foundation pit accidents,a preliminary analysis of possible accidents is made by analyzing the shape,influence scale and magnitude of seepage induced ground subsidence behind the wall.Some advices about how to prevent accident are presented to provid valuable references to similar projects.