A method for prevention and control of impact disasters in thick gas-containing coal seams with large dip angles

Abstract

The invention discloses an impact-disaster control method for a large-dip-angle gas-containing thick coal seam. The impact-disaster control method includes the steps of A, arranging gas extraction roadways, wherein the top extraction roadway and the bottom extraction roadway are arranged according to the lithologic characteristics of all layers in a stratum; B, arranging drill holes, wherein the drill holes are formed in a bottom plate of the top extraction roadway and a top plate of the bottom extraction roadway, and water injecting drill holes and gas extraction drill holes are vertically formed in the same vertical sections of the gas extraction roadways at intervals; C, extracting gas and injecting water, wherein after the drill holes are formed, the whole working-face coal seam is continuously subjected to gas extraction; after gas extraction starts, high pressure water is injected into a contact face of the coal seam and the stratum, and water injecting work is sequentially carried out according to the sequence of the water injecting drill holes; D, finishing water injecting, wherein when the water injecting pressure of a first drill hole is suddenly reduced to a low value, or the humidity of extracted gas is obviously reduced, water injecting of the drill hole is stopped, and high-pressure water injecting is continuously carried out through the next water injecting drill hole. The elastic energy in a coal and rock mass can be reduced; in addition, discharging of free-state gas can be promoted, and the content of the free-state gas in coal can be fully decreased.

Description

technical field [0001] The invention relates to a method for preventing and controlling impact disasters, in particular to a method for preventing and controlling impact disasters in thick gas-containing coal seams with a large dip angle. Background technique [0002] With the continuous mining of coal resources, my country's coal mining continues to develop in depth, and the danger of rock burst is becoming more and more serious. The sudden, sharp and violent occurrence of rock burst accidents seriously threatens the safe production of coal mines. Especially in high-gas mines, the hazards of rock burst are more prominent. It will not only cause damage to tunnels and working faces, casualties, and may Induce coal and gas outbursts, gas explosions and other major vicious accidents. In coal mines, the occurrence of coal seams cannot be completely horizontal, and coal seams generally have a certain inclination angle, so that there will be relative sliding between the coal seam...

AI Technical Summary

Problems solved by technology

Currently, blasting is used to relieve the pressure of rock burst on the roof and floor, but this method is not only troublesome, but also cannot perform blasting and pressure relief when encountering high-concentration gas coal seams. In order to prevent coal and gas outburst and gas explosion In order to reduce the gas content in the coal seam to a minimum

Thick coal seam gas pre-extraction is to excavate the gas drainage roadway in the top and bottom of the coal seam (generally the basic top and basic bottom), drill the gas drainage boreholes into the coal seam in the roadway, and drain the coal seam before mining at the working face. Medium gas is pumped out through drainage boreholes and discharged to the ground or collected on the ground, and finally the high-gas coal seam is reduced to a low-gas coal seam; however, due to the coal-friendly nature of the gas, it is difficult to release the gas in the coal seam when the gas is extracted. Extraction from the coal seam

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