Treatment method for upper corner suspension roof of heavy pitch fully mechanized mining coalface

Abstract

The invention discloses a method for controlling the corner suspended roof of a steeply inclined fully mechanized mining face, which is mainly composed of forced caving drilling, hydraulic fracturing drilling, and advanced pre-splitting blasting drilling. Two rows of forced caving drill holes are arranged along the direction of the support, and a row of advanced pre-splitting blasting drill holes are arranged along the strike direction in the wind tunnel advance support of the coal mining face. Hydraulic fracturing boreholes are arranged in between. The structure is easy to construct, which destroys the integrity of the roof of the goaf in the coal mining face, releases and weakens the pressure of the roof in the advance support section, and can timely collapse the suspended roof of the goaf in the upper corner, reducing the risk of large-scale collapse of the suspended roof. The possibility of gas exceeding the limit is eliminated, and the safety threat caused by the large overhanging area of ​​the upper corner of the steeply inclined fully mechanized mining face to mine gas control and roof management is very effective.

Description

technical field [0001] The invention belongs to the field of coal mine mining safety, and in particular relates to a method for controlling a corner suspended roof on a steeply inclined fully mechanized mining face. Background technique [0002] For the coal mining face of the steeply inclined medium-thick coal seam adopting the longwall retreating comprehensive mechanized coal mining method, the goaf treatment usually adopts the whole caving method to manage the roof. The middle and lower part of the goaf are filled with fullness to form a cushion layer. In the goaf at the upper corner, the roof does not collapse, and the distance of the suspended roof exceeds the operating regulations. The pressure on the outlet support on the coal mining face and the advanced support section of the wind tunnel is obvious, and the deformation of the roadway support is serious, which can easily induce roof accidents. Injuring people, pushing out the corner gas in the goaf, causing the gas ...

AI Technical Summary

Problems solved by technology

[0002] For the coal mining face of the steeply inclined medium-thick coal seam adopting the longwall retreating comprehensive mechanized coal mining method, the goaf treatment usually adopts the whole caving method to manage the roof. The middle and lower parts are fuller filled to form a cushion layer. In the goaf at the upper corner, the roof does not collapse, and the distance of the suspended roof exceeds the operating regulations. The pressure on the outlet support on the coal mining face and the advance support section of the wind tunnel is obvious, and the deformation of the roadway support is serious, which can easily induce roof accidents. Hurt people, press out the corner gas in the goaf, cause the gas to exceed the limit, etc., which seriously restricts and affects the safe production of the coal mining face

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