Grouting treatment method for broken water-rich section of diversion tunnel in karst area

Abstract

The invention provides a grouting treatment method for a broken water-rich section of a diversion tunnel in a karst area. The method includes the following steps: S1) conducting geological explorationon the broken water-rich section of surrounding rock with water inrush to determine a major runoff path of fissure water and/or groundwater; S2) drilling a drainage hole from a tunnel wall of the broken water-rich section of the surrounding rock to the runoff direction of the fissure water and/or the groundwater in the surrounding rock for drainage of the fissure water and/or the groundwater; S3)drilling grouting holes at preset distance along the radial and circumferential directions of the tunnel wall of the broken water-rick section of the surrounding rock and inserting a grouting pipe into each grouting hole; S4) injecting grouting liquid into the surrounding rock through the drainage hole and the grouting pipes to form a water stop curtain circumferentially in the surrounding rock of the tunnel wall. According to the method, a better grouting treatment effect is achieved, the engineering safety is ensured, and the groundwater resource pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a grouting treatment method for the broken water-rich section of a water diversion tunnel in a karst area. Background technique [0002] During the construction of the water diversion tunnel, it is usually encountered that the broken section of the surrounding rock is crossed, and most of the tunnel is located below the groundwater level. The stability of the surrounding rock around the tunnel is poor, the problem of karst water gushing is serious, and the safety risk is great. Usually, grouting is used to block water around the water gushing position, and it often happens that strands of water and water seepage in cracks still exist on the exposed rock surface after excavation during the initial support construction, resulting in more strands of water flowing out after the completion of the initial support construction , and are distributed in various parts of arches,...

AI Technical Summary

Problems solved by technology

[0002] During the construction of the diversion tunnel, it is usually encountered that the broken section of the surrounding rock is crossed, and most of the tunnel is located below the groundwater level. The stability of the surrounding rock around the tunnel is poor, the problem of karst water gushing is serious, and the safety risk is great.

Usually, grouting is used to block water around the water gushing position, and it often happens that strands of water and water seepage in cracks still exist on the exposed rock surface after excavation during the initial support construction, resulting in more strands of water flowing out after the completion of the initial support construction , and distributed in various parts of arches, spandrels, and side walls, which have seriously affected the construction safety and construction operations of the tunnel

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