城市地铁隧道富水区试验段涌水治理

On the Treatment of Water Gush in the Rich-Watered Test Section of a Municipal Subway Tunnel

大连地铁东—春区间地下水丰富,岩溶较发育,特别是此区间2#横通道段水量高达1 000m^3/h;前期采取了横通道及竖井周边7口降水井井点降水措施和井内3台150m^3/h水泵明水抽排措施,降水效果仍不明显,无法达到预期效果而不能正常开展施工。对此,选取横通道范围作为涌水治理试验段,采用分仓围堵和降水联合工法,降水效果明显。通过介绍此试验段的涌水治理方案,为后期工程和类似工程降水施工提供了参考。

Owing to the fact that the Dong—chun Section of the Dalian Subway is rich-watered and comparatively karst-developed,especially the amount of water gush of the 2nd lateral passage of the section is as much as 1,000m^3/h,the water-lowering effect is still not obvious though the technical measures were taken at earlier stages which were seven water-lowering wells were provided around the lateral passage and the vertical shaft,inside which 3 150m^3/h pumps were used to drain.As the desired effect was not achieved,the normal construction could not be carried out as planned.As a result,the range of the lateral passage was chosen as a test section in the treatment of water gush,with technical measures of separating water gush into certain reservoirs and enclosing them,and other combined water-lowering methods adopted.The water-lowering effect thus obtained was obvious.By introducing the water-gush-treating scheme for this test section,the paper aims to provide a useful reference for the water-lowering construction of following and other similar projects.