武汉地铁复兴路站明挖施工水文地质特征分析与渗漏控制

Hydrogeological Characteristics Analysis and Leakage Control of an Open Cut Subway Station in Wuhan

在透水性强的含水砂层中,极易因地下水的作用造成砂土夹泥突涌,导致基坑围护失效和安全风险。为积累富水砂层条件下的基坑渗漏事故处理经验,本文以武汉市轨道交通4号线二期工程明挖地铁复兴路车站深基坑为例,在分析场区的工程地质条件、气象水文与水文地质特征的基础上,结合基坑监测数据,研究基坑渗漏治理过程中的地连墙水平位移、地表沉降以及地下水位的变化规律,以反映渗漏控制效果。研究表明,监测数据可以较好地反映基坑的渗漏过程,采用双液注浆和聚氨酯发泡堵漏剂对基坑渗漏封堵具有较好地应用效果。

In the water bearing sand layer with strong permeability,it is very easy to cause sudden gushing of sand with mud due to the action of groundwater,which leads to the failure of foundation pit support and safety risk.In order to accumulate the treatment experience of foundation pit leakage accident under the condition of water rich sand layer,this paper takes the deep foundation pit of an open cut subway station of Wuhan Rail Transit Line 4 phase II project as an example,analyzes the engineering geological conditions,meteorological,hydrological and hydrogeological characteristics of the site area,and combined with the foundation pit monitoring data,studies the diaphragm wall displacement,foundation pit seepage control,and other factors in the process of foundation pit leakage treatment In order to reflect the effect of leakage control,the surface subsidence and groundwater level are analyzed.The results show that the monitoring data can better reflect the leakage process of foundation pit,and polyurethane can play a good sealing effect on the leakage.