Comprehensive control method of grouting and drainage for high-level abscission water damage in coal mines

Abstract

The invention discloses a grouting-drainage comprehensive treatment method for high-level abscission water hazards in coal mines, and relates to the technical field of high-level abscission water hazards treatment. The method firstly constructs the first three drilling sections of the grouting-drainage hole at the design position, and performs pre-mining grouting for the third drilling section; then constructs the fourth drilling section to discharge water, and carries out grouting and Post-mining grouting; finally, when the working face advances to the next grouting-drain hole, seal the current grouting-drain hole. The invention adopts the innovative idea of ​​"multi-purpose for one hole", and by setting grouting-drainage holes in the aquifer, filling the aquifer with grouting can reduce the water filling strength of the aquifer and the drainage hole for the aquifer water. The combination of the drainage method improves the utilization rate of the borehole; at the same time, the multiple grouting processes such as pre-mining, middle and post-mining grouting and the complementary method of the hydrophobic process during the mining are used to reduce the water filling strength of the aquifer to the separation layer. At the same time, the strength of the overlying rock is strengthened, and the comprehensive control of the water damage caused by the separation of the coal seam roof can be realized from various aspects.

Description

technical field [0001] The invention relates to the technical field of treatment of high-level abscission water hazards in coal mines, in particular to a grouting-drainage comprehensive treatment method for high-level abscission water hazards in coal mines. Background technique [0002] Coal is the main component of my country's energy, and the safe production of coal mines, as one of the major subjects of natural science research in my country, should not be underestimated. During the mining process, the problem of water hazards in coal mines has been a serious constraint on safe and efficient production. The problem of water inrush in coal mines not only affects the development and recovery of mine shafts, but also causes casualties, equipment damage, economic losses, and affects the benefits of coal mine production. [0003] With the continuous increase of coal production in my country, the mining depth and thickness of coal mines continue to increase, and the applicatio...

AI Technical Summary

Problems solved by technology

If the layer where the separation layer is developed is too high from the coal seam roof, it will be difficult to construct the uphole hole, and the argillaceous rock in the Jurassic Anding Formation is easy to soften and disintegrate when exposed to water, resulting in unstable hole structure and easy damage. The hole is completely collapsed or even buried, and the water drainage effect is not ideal

In the process of draining the water from the separation layer through the ground straight-through diversion hole, the separation layer will be deformed due to the impact of mining, causing deformation, damage and blockage of the diversion hole. The construction of the through hole is also difficult, and the drainage efficiency is not high.

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