Prevention and control method of water inrush in coal mining floor stratum on confined water body

Abstract

The invention relates to a method for preventing and controlling water burst of a coal mining base board rock stratum, in particular to a method for preventing and controlling water burst of a coal mining base board rack stratum on a pressure bearing water body. The method comprises the following steps that firstly, a coalface is detected; secondly, drill sites are exploited at the two sides of a lead conveying smooth groove and the two sides of a air returning smooth groove respectively so as to perform drilling according to a detected result in the first step; thirdly, slurry filling casing pipes are arranged at drilling openings of lower three belts of the coal layer base board, and a freezing casing pipe is arranged at the bottommost layer section; fourthly, after drilling is finished, slurry is filled into drill holes, the slurry is sequentially filled, starting from the bottom end and going upwards layer by layer, before the slurry is filled into the bottommost layer and in the slurry filling process, liquid nitrogen is used for performing quick-freezing treatment. According to the method for preventing and controlling water burst of the coal mining base board rack stratum on the pressure bearing water body, the principle that the procedures of detection, slurry filling, freezing and digging are sequentially performed is utilized, slurry filling and freezing are respectively performed on the lower three belts sequentially from bottom to top layer by layer, and therefore water disasters in the excavating process of a deep coal layer base board of a complex geological structure can be effectively prevented from happening.

Description

technical field [0001] The invention relates to a method for preventing and controlling water inrush from a coal mining floor rock layer, in particular to a method for preventing and controlling water inrush from a mining floor rock layer on a confined water body. Background technique [0002] Coal seam floor damage and floor water inrush are common disasters in deep coal mining. As the excavation depth of underground rock mass engineering increases, the problem of high temperature and high pressure karst water damage becomes more and more prominent, which threatens the safe production of coal mines. In order to solve the technical problem of water inrush in the coal mining floor, the traditional concept of water control is "mainly drainage, combined with drainage and blockage". The following two methods are mainly used for water blocking construction: one is floor grouting, and the other is artificial freezing construction processing. The above-mentioned simple floor grout...

AI Technical Summary

Problems solved by technology

Moreover, the simple artificial freezing construction technology is only suitable for water sealing of shallow tunnels, shafts passing through aquifers, etc., and cannot effectively deal with water damage to deep coal seam floors

[0006] Moreover, the traditional artificial freezing construction treatment method will generally cause large frost heave deformation during freezing. In the subsequent thawing process, due to the melting of karst holes and cracks, the strength will often be insufficient, and water seepage and water inrush will easily occur.

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