Construction method for drilling depressurization hole in gob-side mining roadway

Abstract

The invention discloses a construction method for drilling a depressurization hole in a gob-side mining roadway. The construction method comprises the main steps that (1), drilling sampling is conducted in a coal side where a haulage gate of a first coal mining face is not influenced by mining; (2), drilling sampling is conducted on the side, close to a coal mining face and away from a base plate by 1.5 m in height, of the next coal mining face gob-side mining roadway; (3) according to the two drilling sampling processes, the corresponding rule of the drilling depth and the pulverized coal quality value is found out, and the lateral bearing pressure distribution rule of the side, close to the coal mining face, of the gob-side mining roadway is obtained; (4), the stepped depressurization hole is drilled in an area from the front side of the coal mining face to a stopping line along the roadway by reference to the obtained lateral bearing pressure distribution rule; and (5), construction in the next coal mining face gob-side mining roadway is continuously conducted, and the construction steps are repeated till construction is completed. The construction method for drilling the depressurization hole in the gob-side mining roadway has the characteristics of being small in disturbance on the gob-side mining roadway, good in depressurization effect, small in construction difficulty, high in operability, short in construction period, low in construction cost and the like.

Description

technical field [0001] The invention relates to a method for preventing and controlling rock burst in a gob-side mining roadway, in particular to a drilling construction method for a pressure relief hole in a gob-side mining roadway. Background technique [0002] Rock burst is a complex mine dynamic phenomenon, and it has always been one of the difficulties in the research of rock mechanics and mine prevention and control. In the process of coal mining, once rock burst is formed, it will lead to major accidents and disasters. [0003] According to statistics, more than 70% of the rock burst occurs in the mining roadway, especially in the gob-side mining roadway. [0004] At present, the most effective way to prevent rockburst in the mining roadway is to drill pressure relief holes in the coal body of the roadway. The pressure relief holes are generally perpendicular to the coal wall of the roadway. The diameter of the small pressure relief hole is generally less than 100mm,...

AI Technical Summary

Problems solved by technology

[0007] At the same time, pressure relief holes may disturb and damage the surrounding rock of the roadway, which must be considered in theoretical design and field implementation. Especially in deep mines, there are double dangers of rock burst and large deformation of the roadway, which need to be considered

[0008] When the diameter of the pressure relief hole is large and the spacing is small, the expected pressure relief effect can be achieved, but the damage of the roadway is aggravated, the stability of the surrounding rock of the roadway is affected, and the deformation of the surrounding rock roadway is difficult to control

[0009] When the diameter of the pressure relief hole is too small and the spacing is too large, the pressure relief effect is not obvious, and the purpose of preventing rock burst cannot be achieved

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