Construction method for a karst tunnel to penetrate through a high-water-level underground river and water guide structure

Abstract

A construction method for a karst tunnel to penetrate through a high-water-level underground river comprises the following steps that (1) a three-step substep method is adopted for excavating a tunnel to penetrate through an underground river section; (2) a water guide structure which passes through the high-water-level underground river and is in a bridge type overpass tunnel is constructed; (3) a retention wall is arranged around a water inlet of the water guide structure, a runoff path of the underground river is blocked, and water is guided into a water guide pipeline pre-buried in the retention wall; and (4) a water retaining wall is arranged around a water outlet of the water guide structure, and it is guaranteed that water in the underground river pipeline does not flow back into the tunnel range. The invention further provides a water guide structure for construction of the karst tunnel penetrating through the high-water-level underground river, large-flow underground water of the underground river is exposed in tunnel construction, the underground river is guided to the downstream of the underground river in an above-crossing tunnel conduction mode, tunnel construction can be recovered as soon as possible, the underground water environment is protected, and the large-flow underground water pumping and draining cost is saved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for a karst tunnel crossing a high-water-level underground river and a water-guiding structure. Background technique [0002] In the construction of tunnels in karst areas, underground karst pipelines and underground river systems are well developed in the area, and they will inevitably encounter the threat and challenge of water inrush. It is difficult to control drainage during the construction period, and improper treatment may easily cause tunnel submersion, surrounding rock instability, and structural damage. damage, and even cause serious accidents such as heavy casualties. [0003] At present, tunnels in karst areas are passing through underground rivers. According to the development of underground rivers revealed by on-site excavation, bridges are generally used to cross them, and drainage tunnels are added under tunnels to drain water. ...

AI Technical Summary

Problems solved by technology

[0002]Construction of tunnels in karst areas, where underground karst pipelines and underground river systems are well developed, will inevitably encounter the threat and challenge of water inrush. Difficult, improper treatment may easily lead to serious accidents such as tunnel submersion, surrounding rock instability, structural damage, and even serious casualties

[0003]At present, tunnels in karst areas are passing through underground rivers. According to on-site excavation to reveal the development of underground rivers, bridges are generally used to cross over, and drainage tunnels are added under the tunnels to drain water. However, when the intersection of the tunnel and the underground river is at the upper part of the tunnel section, the underground river has a large amount of water inflow and the river slope is gentle, and the height difference between the upstream and downstream exposure points is small, the traditional treatment method for the underground river is no longer applicable.

Images