论富水砂土层基坑降止水方法的有效性

Discussion of the Effectiveness of Messures Lowering or Preventing Groundwater aroud the Deep Foundation Pit in Water-rich Sand Stratum

浦口大道地铁十号线临江站地下过街通道工程位于长江边,基坑采用SMW工法桩支护,基坑内设有多口降水井,工作井采用三轴深搅桩满堂加固或裙边加固,通道基坑采用三轴深搅桩抽条加固,基坑开挖穿越多层富水砂层。在1#、2#通道基坑开挖过程中,出现了涌砂涌水现象,并采用一系列措施进行控制。文章主要阐述基坑开挖过程中出现的涌砂涌水现象,并对产生涌砂涌水现象原因进行分析,阐述控制涌砂涌水现象的有效措施。

The underpass of Linjiang Station,Pukou Avenue Metro Line 10 is located on the bank of the Yangtze River.The foundation pit is supported by Soil Mixing Wall.There are multiple precipitation wells in the foundation pit.The Pipe jacking work wells foundation stabilization are fully or partly by three-axis Cement-soil Mixing piles.The vice tunnels foundation stabilization are partly by three-axis Cement-soil Mixing piles,and the foundation pit excavation passes through multiple layers of water-rich sand layers.During the excavation of the foundation pits of 1#and 2#vice tunnels,there was a phenomenon of gushing water and sand,and a series of measures were adopted for control.This paper mainly describes the phenomenon of gushing water and sand during the excavation of foundation pit,and analyzes the causes,and expounds effective measures.