Open-cut tunnel water-stop structure and construction method for protecting groundwater environment

Abstract

The invention relates to an underground construction technology, and specifically relates to an open-excavated tunnel water stopping structure for protecting a groundwater environment and a construction method thereof. The open-excavated tunnel water stopping structure comprises vertical frozen earth water stopping layers arranged at two sides of an open-excavated foundation pit of a tunnel, and a horizontal frozen earth water stopping layer arranged at the bottom part of the open-excavated foundation pit of the tunnel, wherein the vertical frozen earth water stopping layers intersect with the horizontal frozen earth water stopping layer; the bottom parts of the vertical frozen earth water stopping layers are lower than the bottom part of the horizontal frozen earth water stopping layer. According to the open-excavated tunnel water stopping structure, the vertical frozen earth water stopping layers and the horizontal frozen water stopping layer form a U-trough shaped frozen earth water stopping layer to protect the groundwater environment, and thus the groundwater can be prevented from being polluted during the tunnel construction process; a frozen earth water stopping structure is adopted, so that wide-range draining construction can be avoided, and precious groundwater resources can be saved; meanwhile, surrounding buildings and structures can be prevented from being subjected to sedimentation and deformation caused by the draining construction.

Description

technical field [0001] The invention relates to underground engineering technology, in particular to an open-cut tunnel water-stop structure and a construction method for protecting the groundwater environment. Background technique [0002] For subway construction in water-rich areas, when the subway tunnel is constructed by the open-cut method, it is the basic work before the tunnel excavation to use water stop or drainage to treat the groundwater within the tunnel excavation range. At present, the water stop of subway tunnels in my country generally adopts grouting water stop or rotary grouting pile water stop. These two water stop methods need to inject cement slurry into the soil layer, which will pollute the water quality of groundwater. At the same time, the flow direction of cement slurry is not easy to control, and it is easy to block groundwater. The seepage channel changes the seepage path of groundwater. However, if the drainage scheme is adopted, precious groundw...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an open-cut tunnel water-stop structure and construction method for protecting the groundwater environment, so as to solve the problems of underground water quality pollution and protection of groundwater resources during tunnel construction.

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