Method for impact prevention when deep well thick coal seam complicated geological condition multi-factor-coupled high-stress region passing connection roadways

Abstract

The invention belongs to the technical field of mine coal mining impact-prevention management, and particularly discloses a method for impact prevention when a deep well thick coal seam complicated geological condition multi-factor-coupled high-stress region passing connection roadways. The method includes the following steps that S1: repair of the connection roadway: repair and roof reinforcementwork is performed on the connection roadway in advance, and dinting and roof brushing are performed locally. By the aid of the method for impact prevention when the deep well thick coal seam complicated geological condition multi-factor-coupled high-stress region passing the connection roadways, the effective pressure-relief protection zone is formed in advance, the low-stress state of the working surface is guaranteed, the goaf side abutment pressure influence is reduced, the low-stress state nearby the working surface is guaranteed, side coal body blasting is implemented 150 m before and behind two crossheading connection roadways, the coal body stress is reduced, deep large-diameter pressure-relief holes are constructed in the connection roadways towards the working surface in advance,the pressure-relief holes are cut through in advance, the coal pillar stress between the connection roadways and the working surface is reduced, and adhesive tape crossheadings of the working surfaceare all supported by fore supports for the first time.

Description

technical field [0001] The invention relates to the technical field of coal mining anti-scour control technology in mines, in particular to a method for anti-scour of crossing lanes in deep mines, thick coal seams, complex geological conditions, multi-factor coupling and high stress areas. Background technique [0002] Coal mines are areas where human beings exploit coal resources in coal-rich mining areas. They are generally divided into underground coal mines and open-pit coal mines. When the distance to the surface is very short, it is generally chosen to directly strip the surface soil layer to excavate coal. This is an open-pit coal mine. Most of the coal mines in my country belong to underground coal mines, usually including roadways, shafts and mining faces, among which deep shafts and thick coal seams are Refers to the coal seam mined above 3.5m by underground mining and above 10m by open-pit mining. [0003] The connection roadway is a structural form used in conjunc...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for anti-scouring of crossing lanes in the complex geological conditions of deep wells, thick coal seams, multi-factor coupling and high stress areas, so as to solve the problems of faults, anticline structures, roadway cutting, etc. Affected by multiple factors, the stress is highly concentrated. When the working face advances to the connecting roadway, under the joint influence of multiple factors such as the leading bearing pressure of the working face, the lateral bearing pressure of the goaf, and the structural stress, it is very easy to induce rock burst. In the hazard analysis, due to the influence of residual abutment pressure in the goaf of the working face, shear stress is likely to be formed on the slope of the anticline, which is the main factor for the anticline structure to induce rock burst, and large deformation is likely to occur at the top of the anticline , with the advancement of the working face, the area of ​​the island coal body gradually shrinks, and at the same time, affected by the mining, the stress of the fault structure is released. Therefore, due to the joint action of the two factors, the pressure on the island coal body continues to increase. When the working face is mined, The advanced bearing pressure of the working face and the concentrated stress formed by the two faults are gradually superimposed, forming a concentrated high stress, which cannot maintain a balanced and stable advancement of the working face, and the safety of anti-scouring is poor

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