A Coal Pressure Relief Method for Steeply Inclined Extra-thick Coal Seam

Abstract

The invention discloses a method of pressure relief of a coal body of a high-dipping super high seam. The method comprises the following steps of step 1, dividing the high-dipping super high seam into a plurality of coal seams in a vertical direction; step 2, arranging an air inlet way, an air return way and a cut hole in the top coal seam; step 3, soaking the coal body of the top coal seam for the first time; step 4, blasting the coal body of the top coal seam; step 5, soaking the coal body of the top coal seam for the second time, and starting recovery while soaking the coal body of the top coal seam for the second time; step 6, carrying out pressure relief treatment on the next coal seam according to the methods in the step 2 to step 5; step 7, repeating the step 6 for multiple times until the pressure relief of the coal bodies of all coal seams is completed. The method of pressure relief of the coal body adopts the manners of firstly, injecting liquid and soaking, secondly, blasting, and lastly, injecting the liquid again to soak, so that the coefficient of mining and the mining safety are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a coal body pressure relief method for steeply inclined extra-thick coal seams. Background technique [0002] In the Urumqi mining area, the steeply inclined (inclination angle is 45°-87°) ultra-thick coal seam high stage (15.0m-30.0m) horizontal segmented fully mechanized caving face is short, and the coal body contains a large amount of gas and hydrogen sulfide, which is prone to spontaneous combustion. Improving the caving performance of the top coal is one of the key technologies to realize safe and efficient mining of steeply inclined extra-thick coal seams. The law of rock movement in the disturbed area of ​​deep mining of steeply inclined ultra-thick coal seams is complex, and the deep horizontal sub-level fully mechanized caving face is always in the mining condition of "three tops (headspace, top water, top fire and gas)". The control of deep coal-rock dy...

AI Technical Summary

Problems solved by technology

The difficulty of top-coal weakening lies in the influence of coal seam joints and fracture dip angles. Traditional water injection methods cannot achieve coal seam water retention and fracturing well, and it is difficult to improve wettability. Safe and Efficient Mining

In addition, in view of the characteristics of high-stage caving in steeply inclined and extra-thick coal seams, there are serious deficiencies in the existing domestic charging technology and equipment, and the performance of the equipment needs to be greatly improved

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