Construction method for tunnel working face counterpressure treatment during tunnel excavation

Abstract

The invention discloses a construction method for tunnel working face counterpressure treatment during tunnel excavation, which is used when a working face is unstable with geology of fully weathered or severely weathered wall rocks and intense water gushing or mud gushing. The construction method is characterized in that the method comprises the following steps: A, building a wall with selected tunnel slag at a position close to a tunnel working face and adding flaky rubbles into the piled up tunnel slag when the tunnel working face undergoes intense mud gushing; B, spraying concrete on the surface of the built wall to form a curtain; C, arranging a plurality of aqueducts and grout pipes on the surface of the built wall; and D, adopting mixed slurry of cement and water glass to grout thebuilt wall body through the grout pipes. Because the construction method can effectively prevent a tunnel working face from being hollowed out by water during carrying out reinforcement treatment of an excavated tunnel, the formation of a greater cavity inside the tunnel working face can be avoided; and the method also improves construction quality and accelerates construction during tunnel excavation.

Description

technical field [0001] The invention relates to a treatment method for the tunnel face, especially a method suitable for fully weathered or strongly weathered surrounding rocks, and the tunnel face has large water or mud gushing, which makes it difficult for the tunnel face to self-destruct. The construction method used in the tunnel excavation to deal with the back pressure of the tunnel face under stable conditions. Background technique [0002] During the excavation of the tunnel, the face of the tunnel is dominated by full and strongly weathered surrounding rocks, and a large water gushing occurs on the face of the tunnel, and under the action of water erosion, the face of the tunnel is difficult to stabilize itself, and its slag is hollowed out by the water Cavities are formed, and when the situation is serious, collapse occurs, or the face of the tunnel is dominated by fully weathered sandstone, driven by the erosion of water, mud-rock flows are formed, and mud gushing...

AI Technical Summary

Problems solved by technology

[0002] During the excavation of the tunnel, the face of the tunnel is dominated by full and strongly weathered surrounding rocks, and large water gushes appear on the face of the tunnel, and under the action of water erosion, the face of the tunnel is difficult to stabilize itself, and its slag is hollowed out by the water Cavities are formed, and when the situation is serious, collapse occurs, or the face of the tunnel is dominated by fully weathered sandstone, driven by the erosion of water, forming debris flow and mud gushing. If there is a bad situation on the face, if you wait until the face is stable before processing, the face will be hollowed out under the action of water, and most of the slag will be taken away, forming a large cavity, which will increase the difficulty of subsequent processing, thus Affected the construction quality and construction progress

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