Extremely thick coal seam accurate danger relieving and yield increasing method based on directional drilling advanced high-pressure water injection

Abstract

The invention discloses a precise danger relieving and yield increasing method for an ultra-thick coal seam based on directional drilling advanced high-pressure water injection. The method comprises the steps that firstly, pressure relief tunneling construction of a roadway is conducted; 2, dividing a pressure relief stoping construction section of the stoping face of the coal seam; thirdly, advanced water injection pressure relief construction is conducted on the pressure relief stoping construction section; 4, measuring the impact risk of the current pressure relief stoping construction section; 5, performing supplementary pressure relief on the current pressure relief stoping construction section; 6, the current pressure relief stoping construction section is subjected to stoping construction; and 7, correcting the long-distance directional advanced pressure relief drill hole group of the next pressure relief stoping construction section, and implementing advanced water injection pressure relief stoping construction. According to the method, the roadway section in the high-impact-tendency ultra-thick coal seam is always tunneled in the semi-surrounded water injection pressure relief area, so that the tunnelling speed is increased, and rock burst disasters are prevented; meanwhile, top coal seam water injection softening and pressure relief are achieved, and the purposes of pressure relief and scour prevention are achieved; in addition, the caving property of top coal can be improved, and the coal yield is increased.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a method for accurately resolving dangers and increasing production of huge thick coal seams based on directional drilling and advanced high-pressure water injection. Background technique [0002] my country is rich in coal resources, and the thickness of the coal seam is large. Especially in the coalfields in the northwest region, there are many extremely thick coal seams, and there are even huge thick coal seams with a single layer thickness of more than 200m. With the further increase in the demand for coal resources, the depth and intensity of coal mining continue to increase, and at the same time, natural disasters such as rock bursts are aggravated. Some mine disasters are coupled and superimposed, and the uncertainty of major risks is high and difficult, and the difficulty of prevention and control is further increased. Especially in the layered fully-mecha...

AI Technical Summary

Problems solved by technology

However, the demand for pressure relief in layered mining of thick coal seams with strong impact tendencies cannot be met. The reason for rock bursts in thick coal seams with strong impact tendencies is that the coal body is in a state of high stress. Because the coal body is thick and hard, it can accumulate A large amount of elastic energy will impact when the load limit of the coal and rock mass is reached, which will greatly affect the safety of roadway excavation construction and coal face mining construction

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