Karstic water treating method for diversion tunnel

Abstract

The invention discloses a karstic water treating method for a diversion tunnel. According to the method, based on the state of exposed surrounding rocks during the diversion tunnel excavation process, and the position and the water pouring volume of a water pouring point of karstic water in the diversion tunnel, the position and development condition of a karstic water channel above the diversion tunnel is predicted. A drainage tunnel which is in space-crossing with the diversion tunnel is dug in the direction from the ground to the position of the karstic water channel above the diversion tunnel, the karstic water channel above the drainage tunnel is cut off by the diversion tunnel, the karstic water is drained through the drainage tunnel, and dangers to the diversion tunnel from the karstic water is eliminated, so that the structural safety of the diversion tunnel is guaranteed. According to the karstic water treating method for the diversion tunnel, be means of a comprehensive treating principle of 'relying mainly on discharging and combined with prevention, draining, intercepting and blocking', and a treating plan is made in accordance with local conditions, the potential safety hazard to the diversion tunnel from the karstic water is thoroughly eliminated, the possible occurrence of a water bursting risk in the diversion tunnel is effectively solved, and the structural safety of a water diversion system is guaranteed.

Description

technical field [0001] The invention relates to a method for treating karst water in a water diversion tunnel, belonging to the technical field of hydraulic construction in water conservancy and hydropower projects. Background technique [0002] Karst water is the groundwater that exists in the dissolution fissures and caves of soluble rock formations, also known as karst water. Its most obvious feature is that its distribution is extremely uneven, and it is especially common in limestone areas. Medium-thick limestone is more favorable for the layout and structural stability of the water diversion tunnel, but the development of cracks and karst is often accompanied by water gushing and seepage, and even concentrated water gushing occurs during the flood season. During the construction period, the tunnel encounters a sudden attack of water gushing and extremely large water gushing, and it is often submerged. The construction site, washing away machinery and tools, causing equ...

AI Technical Summary

Problems solved by technology

For the inrush of water, according to the traditional method, it mainly adopts buried pipe drainage in the cave, consolidation grouting and other methods to deal with it. Since the actual direction of karst is relatively complicated, when the water inflow is large, buried pipe drainage, consolidation grouting, etc. There are great construction difficulties and construction risks in the plugging, the processing cost is high, and the plugging effect cannot be guaranteed

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