杭州特殊粉砂层基坑降水应用探讨

On application of foundation pit precipitation of special silty bed in Hangzhou City

通过介绍杭州轨道交通某基坑降水项目工程地质、水文地质情况及施工中遇到的实际问题,即基坑开挖至第③5层粉砂下部最后一层土时疏干降水效果较差,基坑下翻梁施工困难。对第③5层粉砂在该地区的工程特性及基坑底部降水效果展开分析,从而提出杭州萧山钱塘江区域基坑降水的可行性办法--管井降水+轻型井点降水。

By introducing the geological and hydrogeological conditions for some foundation pit precipitation in Hangzhou rail transportation and its difficulties in the construction,which is the insufficient effect in the drainage and precipitation when the foundation pit excavation was undertaken to the lower part of the ③5 silty layer leading to the construction difficulties for the upturned beam,the paper analyzes the engineering features of the ③5 silt layer and its precipitation effect of the foundation bottom,so as to point out the feasible method,which is tube well precipitation plus light well point precipitation,for the foundation pit precipitation at Qiantangjiang Area of Xiaoshan District in Hangzhou.