Water Hazard Prevention and Control Method for Roadway under Strongly Rich Water and Weakly Consolidated Aquifer

Abstract

The invention discloses a method for preventing and controlling water hazards in tunnels under strong water-rich and weakly cemented aquifers, which include long-distance directional drilling for intercepting groundwater in the aquifer on the roof of the tunnel, conventional drilling, bolt grouting, and U-shaped steel shed support and other steps. The present invention combines the characteristics of the aquifer thickness, water-richness, cementability and water-resisting layer thickness of the roof of the tunneling roadway, adopts long-distance directional drilling to intercept and dredge the groundwater; drills and injects grout to seal the water seepage crack of the roadway; anchor rod grouting Cooperate with the technical scheme of U-shaped steel shed support, through long-distance directional drilling to intercept the water supply of the roadway roof aquifer to the roadway, and at the same time, drain and grout the conventional drilling and grouting bolts to seal the water seepage cracks and anchors in the roadway The water seepage channel between the rod, the anchor cable and the rock formation effectively reduces the water inflow of the excavation roadway and strengthens the support of the roadway, thus avoiding the occurrence of water damage and roof accidents in the excavation roadway under the strong water-rich and weakly cemented aquifer.

Description

technical field [0001] The invention relates to the technical field of mine safety, in particular to a method for preventing and controlling water damage in roadways under strong water-rich and weakly cemented aquifers. Background technique [0002] The Jurassic coal resource reserves in the west of my country account for about 60% of the total reserves. With the gradual depletion of coal resources in the east, the focus of coal production is gradually shifting to the west. Its position in the national economic construction is becoming more and more important. The safe production of mines has become a national priority. An important guarantee of energy supply. Due to the ubiquity of bedrock fissure aquifers and loose aquifers in the coal seam roofs of Jurassic coalfields, coupled with high-intensity mining conditions, when the damage range of the mining face spreads to the overlying aquifers, water damage accidents often occur. According to statistics, tunneling roadway is t...

AI Technical Summary

Problems solved by technology

[0006] In view of the fact that conventional drilling and grouting techniques cannot effectively solve the problems of water hazards and roof accidents during the excavation of roadways under strong water-rich and weakly cemented aquifers, the purpose of the present invention is to provide a roadway water hazard prevention and control method for roadways under strong water-rich and weakly cemented aquifers Methods: According to the characteristics of the aquifer thickness, water-richness, cementability and thickness of the water-resisting layer on the roof of the excavation roadway, long-distance directional drilling is adopted to intercept and guide the groundwater; drilling and grouting are used to seal the water seepage cracks of the roadway; The technical scheme of U-shaped steel shed support realizes the safe excavation of the roadway under the strong water-rich and weakly cemented aquifer

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