Water stopping and anti-freezing structure and construction method for tunnel in high-cold freeze-thaw water-rich environment

Abstract

The invention discloses a water stopping and anti-freezing structure and construction method for a tunnel in a high-cold freeze-thaw water-rich environment. The anti-freezing structure comprises a primary lining layer, an anti-freezing buffer layer, a frost heaving absorbing plate, a cementing mixture water stopping layer, a waterproof layer, a thermal insulation layer, a mortar bonding layer anda secondary lining layer from inside to outside in sequence from surrounding rock. The construction method comprises the following steps: spraying concrete on the inner side of the surrounding rock toform the primary lining layer, and spraying foam concrete on the inner side of the primary lining layer to form the anti-freezing buffer layer; paving a rubber plastic plate as the frost heaving absorbing plate, constructing the cementing mixture water stopping layer on the inner side of the rubber plastic plate, and then paving the thermal insulation layer; paving the mortar bonding layer between the thermal insulation layer and the secondary lining layer; and embedding a drainage device and a heat supply device in the vault and two sides of the secondary lining layer in advance, wherein thesecondary lining layer is made of porous light-weight aggregate concrete. The water stopping and anti-freezing structure and construction method for the tunnel in the high-cold freeze-thaw water-richenvironment have the water stopping effect in the construction period under the high-cold freeze-thaw water-rich environment, and can prevent and control frost heaving and freeze thawing damage in the operation period.

Description

technical field [0001] The invention relates to a water-tight and anti-freezing structure and a construction method for a tunnel in a high-cold freeze-thaw environment rich in water. Background technique [0002] With the continuous development of my country's economic construction and the rapid expansion of the transportation industry, the pressure on ground traffic is becoming increasingly severe. Coupled with the continuous progress in the research and development of underground space engineering technology, it is bound to drive the construction of a large number of underground rail transit projects, and the construction of tunnel projects will bring unprecedented huge challenge. Because urban underground rail transit projects generally have a shallow buried depth, complex geological conditions are often encountered during excavation, especially water-rich geological structures, and the research on the anti-seepage capacity of tunnels has become a key technical problem. P...

AI Technical Summary

Problems solved by technology

However, for the water seepage problem of the tunnel during the operation period, the water seepage is usually blocked, which will cause water accumulation in the blocked part and the bad situation of water seepage in the vicinity, resulting in greater seepage

The traditional structural form has relatively poor water-stopping effect, and fails to block the seepage of water into the tunnel in time, which increases the probability of frost heaving and thawing of tunnel engineering in permafrost regions

Aiming at the problems of water seepage and freezing damage in the existing tunnel construction in permafrost regions, the solutions are often repeated and cannot be completely solved for a long time and the existing deficiencies. This paper proposes a method with reasonable structure, simple construction, long-term efficiency and low price. Inexpensive, green and environmentally friendly structural form of water sealing and antifreeze for tunnels

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