A comprehensive control structure and construction method of tunnel karst cave and groundwater

Abstract

The invention discloses a tunnel karst cave and underground water comprehensive treatment structure and a construction method so as to effectively ensure the tunnel structure and construction safety and not affect the environment. Out of the range of a tunnel, a tunnel outside drainage vertical well communicated to a water outlet inside the tunnel is arranged from the ground surface, a tunnel inside vertical well is arranged below the tunnel, a drainage transverse channel connected with the tunnel outside drainage vertical well and the tunnel inside vertical well is arranged, the bottom of the tunnel is provided with a bottom beam crossing a karst cave, a whole-seal anti-hydraulic pressure lining is constructed inside the tunnel, and the whole-seal anti-hydraulic pressure lining extends by a certain length back and forth inside the karst cave.

Description

technical field [0001] The invention relates to tunnels, in particular to a tunnel karst cave and groundwater comprehensive control structure and construction method. Background technique [0002] During tunnel excavation and lining structure construction, plugging measures and drainage measures are generally used to treat karst caves and groundwater. There are some problems objectively in the plugging measures. For example, the exposed karst water is a groundwater drainage channel, which is at the end of the drainage, and the water volume is large. The hidden danger of blind plugging is great, and the plugging is difficult, and the construction risk is high; even if the temporary water blocking is successful, then It will inevitably cause the groundwater level to rise. At the same time, due to the irregularity of karst development and the destruction of the original groundwater system, it is difficult to determine the height of the new water head, and it is also difficult t...

AI Technical Summary

Problems solved by technology

There are some problems objectively in the plugging measures. For example, the exposed karst water is a groundwater drainage channel, which is at the end of the drainage, and the water volume is large. The hidden danger of blind plugging is great, and the plugging is difficult, and the construction risk is high; even if the temporary water blocking is successful, then It will inevitably cause the groundwater level to rise. At the same time, due to the irregularity of karst development and the destruction of the original groundwater system, it is difficult to determine the height of the new water head, and it is also difficult to determine the influence range of karst water on the tunnel longitudinally. The thickness is also difficult to determine. Blind handling may cause the tunnel to be hidden under the action of high-pressure water, and its side walls and inverted arches are prone to bursting, which may endanger driving safety and even cause hidden dangers of passenger casualties.

The diversion measure is to set up drainage tunnels to divert and drain karst water. The advantage is that the drainage path is clear, which solves the safety hazard caused by blind blockage. However, new environmental problems caused by drainage are unpredictable, and the construction period is long and the investment is large. Great impact on the environment, construction period and investment

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