Construction method for drainage of tunnel vault in karst area

Abstract

The invention provides a construction method for drainage of a tunnel vault in a karst area, and belongs to a construction method of a tunnel. The construction method is characterized in that in tunnel construction, firstly, straight holes are drilled in a rock stratum of the excavated tunnel vault, guiding pipes are driven in the straight holes, the guiding pipes are arranged in a quincunx shape,grouting is conducted between every two adjacent guiding pipes at intervals or grouting is not conducted between every two adjacent guiding pipes, the grouted guiding pipes have the function of stabilizing surrounding rock, the non-grouted guiding pipes have the function of late draining water in the surrounding rock, after the surrounding rock is fixed, the tunnel continues to be excavated; after the guiding pipes are driven into the vault of the tunnel wall, grooves in right-angle n shapes are dug in the position, corresponding to the parts located on the left side and the right side of thecenter line of a circular-arc-shaped vault of the tunnel by 15 degrees, of the tunnel wall with sprayed concrete layers, cuboid steel plates with evenly-distributed circular holes are correspondinglyembedded in the grooves, the steel plates are pitched into the rock stratum of the vault, thus part of water amount of a karst water system can be released, later stress concentration caused by a large amount of water is effectively avoided, and the serious quality and safety problems of the tunnel are avoided.

Description

technical field [0001] The invention belongs to a tunnel construction method, in particular to a tunnel drainage construction method in a karst area. Background technique [0002] In road construction in mountainous areas, tunnel construction is often encountered, especially in Guizhou, Yunnan and Sichuan, China. Due to their unique landforms, there are many underground karst caves and karsts. The maintenance of the tunnel has brought great difficulties. Generally speaking, in the process of tunnel construction, when encountering karst caves and karsts, multi-channels and a combination of methods are used to guide, discharge, circumnavigate, and pass, so that the karst caves In addition, after the completion of the tunnel, due to the influence of karst caves and karst water in some tunnels, there will often be water leakage in the tunnel. 1. The bottom plate of the tunnel is squeezed and damaged by karst water. 3) The lining is cracked, deformed or even damaged, which will ...

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Problems solved by technology

[0002] In road construction in mountainous areas, tunnel construction is often encountered, especially in Guizhou, Yunnan and Sichuan, China. Due to their unique landforms, there are many underground karst caves and karsts. The maintenance of the tunnel has brought great difficulties. Generally speaking, in the process of tunnel construction, when encountering karst caves and karsts, multi-channels and a combination of methods are used to guide, discharge, circumnavigate, and pass, so that the karst caves In addition, after the completion of the tunnel, due to the influence of karst caves and karst water in some tunnels, there will often be water leakage in the tunnel. 1. The bottom plate of the tunnel is squeezed and damaged by karst water. 3) The lining is cracked, deformed or even damaged, which will endanger the driving safety and even interrupt the driving. Therefore, during the construction of the tunnel, how to effectively drain the water in the cave , in the later operation of the tunnel, how to solve the problem of water flow control and drainage in the karst caves and karsts on the top of the tunnel is a topic for relevant technical personnel to explore

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