武汉高层建筑深基坑地下水防治的工程实践中的若干问题

武汉市高层建筑基坑工程面临的重大困难课题之一，就是汉口地区深厚的承压含水砂层经常出现渗透破坏现象，如：坑壁漏水冒砂，坑底流土突涌，危及基坑安全，导致环境破坏。根据该地区工程水文地质条件和基坑工程中地下水渗透流网特征，就基坑地下水治理方法的优选、支护与止水结构的关系以及降水引起地面沉降的计算等问题作了较深入的探讨。

One of the key problems of the deep foundation pit of tall building in Wuhan is that the seepage failute often occures in the thick artesian sandy aquifer in Hankou area. Such as water leaking and sand falling in the wall, soil flowing and step blowing in the bottom. They endangers the safety of the pit and leads to failute of environment. Mainly introduces the hydrogeological conditions and tne characteristics of groundwater seepaging net in foundation pit in this area. And discusses the selection of groundwater prevention method, the relationship between support and water-stopping structure and the calculation about the surface subsidence due to dewatering.