Coal mine thick and hard sandstone roof water disaster and rock burst composite disaster control method

Abstract

The invention discloses a coal mine thick and hard sandstone roof water disaster and rock burst composite disaster treatment method which comprises the following steps: determining the height of a water flowing fractured zone, and then determining the position of a thick and hard sandstone aquifer within the height range of the water flowing fractured zone; determining a thick and hard sandstone aquifer mining influence range boundary R; determining the horizontal distance S1 between the lateral curtain of the boundary of the first mining working face and the lateral boundary of the goaf; the arrangement position of a first continuous lateral curtain is determined; a boundary lateral curtain and a first continuous lateral curtain are constructed through hydraulic fracturing grouting; lateral water interception and seepage prevention and normal stoping of the first mining working face are completed; lateral water interception and seepage prevention and normal stoping of the first continuous working face are completed; lateral water interception and seepage prevention are conducted on the second continuous working face; and so on, until the coal seam in the mining area or the panel is completely mined. According to the method, cooperative prevention and control of roof water disasters and rock burst disasters are achieved, the mine water inflow is greatly reduced finally, and the prevention and control effect of getting twofold results with half the effort can be achieved.

Description

technical field [0001] The invention belongs to the technical field of coal mining safety, and in particular relates to a method for treating the composite disaster of water damage and rock burst on the roof of thick and hard sandstone of a coal mine. Background technique [0002] With the increase of the mining depth of coal mines in my country, more and more coal mines are faced with the mining environment of high water pressure and high ground stress. As one of the important energy bases in my country, the Mongolian-Shaanxi mining area is mainly mining when the Jurassic Yan'an Formation impacts the inclined coal seams. , the thick hard water-rich sandstone layer of Luohe Formation often occurs on it, and at the same time, it is faced with two major problems of hard roof rock burst and roof water damage during high-intensity mining. [0003] In the prior art, when preventing and controlling the rockburst and water inrush disasters in the above-mentioned mines, they are ofte...

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Problems solved by technology

[0003] In the prior art, when preventing and controlling rock burst and water inrush disasters in the above mines, they are often separated from each other and are independent of each other; that is, from the perspective of preventing rock burst, it is necessary to adopt hydraulic fracturing, near-field blasting pre-splitting, and large-diameter drilling. Pressure relief and other local pressure relief methods; mine water damage prevention and control often adopt measures such as pre-mining roof pre-drainage and increasing drainage capacity. It is difficult for the grout to pass through, so it is difficult to realize the direct grouting of the sandstone roof; the prevention and control measures are huge, costly, and cannot eliminate the threat of combined disasters of rock burst and roof water on the hard roof, which seriously threatens the safety of coal mine production. To sum up, continue a method capable of synergistic prevention and control of rock burst and water inrush disasters

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