Tunnel water seepage and harmful gas discharge structure and construction method of semi-closed ice-filled drilling

Abstract

The invention discloses a tunnel water seepage and harmful gas discharge structure and a construction method for a semi-closed ice-filled borehole. The grout section, the borehole is drilled from the side wall of the tunnel, a water-stop member is provided between the permeable section and the grouting section, the permeable pipe is filled with ice, and the permeable section is provided with a drainage pipe The water inlet, the elevation of the water inlet of the drainage pipe is higher than the elevation of the water outlet of the drainage pipe, and the head of the drainage pipe is smaller than the height of the water column corresponding to the atmospheric pressure. This structure can effectively discharge harmful gas in the surrounding rock in the drainage link, reduce the escape of harmful gas or a large amount of accumulation in the surrounding rock, reduce safety risks, and can effectively support the water-stop component during grouting, which is conducive to increasing the grouting pressure. Improving the negative pressure effect of the permeable section is conducive to ensuring continuous drainage and exhaust effects, and is of great significance to solving the problems of water seepage and gas leakage in tunnels.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a tunnel water seepage and harmful gas discharge structure and a semi-enclosed ice-filled drilling construction method. Background technique [0002] Local groundwater seepage occurs when the waterproof layer or lining structure of the tunnel is defective. Especially in water-rich tunnels, the water seepage is more serious. Water seepage from the wall of the tunnel will have a negative impact on the safe operation of the tunnel, and even damage the tunnel lining concrete and the internal structure of the surrounding rock, reducing the durability of the tunnel structure and shortening the service life of the tunnel. . At present, the commonly used tunnel water seepage treatment method: for small area water seepage, quick-setting material is commonly used to block water by grouting, using dense horizontal and circular drainage holes, and adding longitudinal blind ditch ...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the solution of tunnel water seepage through negative pressure drainage in the prior art, which has the problem of grouting, resulting in unsatisfactory negative pressure formation effect, and at the same time, the harmful gas escaping along the drainage structure is difficult to separate from the water, and the separation cost is high. Due to the above shortcomings such as complex construction and high operational safety risks, a construction method for tunnel water seepage and harmful gas discharge structure and semi-enclosed ice-filled drilling is provided

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