6-8m低渗透性粉细砂地层隧道内水平真空降水井施工技术研究

Research on Construction Technology of Horizontal Vacuum Drain Well in Tunnel of 6~8m Low Permeability Fine Sand Formation

地铁建设工程降水复杂程度及处理难度远高于一般基坑降水工程。文章以北京地铁三号线04合同段平房村站~东坝中街站区间为例,对6~8m低渗透性粉细砂地层隧道内降水处理施工技术进行分析,在采取地面管井降水+深孔注浆等措施进行降排水后仍存在层间残留水情况下,通过采用水平真空降水井施工工艺完成了降水井套管封堵,在接入真空泵以后完成了本次抽水施工。

The complexity and difficulty of dewatering in subway construction engineering is much higher than that in general foundation pit dewatering engineering.The article takes the interval between Pingfangcun Station and Dongbazhongjie Station on Contract 04 of Beijing Metro Line 3 as an example,for 6 to 8 m low permeability silty sand stratum tunnel construction technology in the precipitation were analyzed,and the ground tube well precipitation+deep hole grouting and other measures still exist after draining water interlayer residual water conditions,through the adoption of horizontal vacuum dewatering well construction technology completed the dewatering well casing seal,after the access to the vacuum pump has completed the construction of pumping.