Beside-roadway topping pressure relief method of roadway driving along gob of small coal pillar influenced by dynamic pressure

Abstract

The invention discloses a beside-roadway escribing pressure relief method of roadway driving along a gob of a small coal pillar influenced by dynamic pressure. The method includes the following steps: adopting roadway roof deep hole blasting as the escribing method, arranging escribing shot holes within the overall length range of an adjacent working surface crossheading of the roadway driving along the gob, and implementing stage blasting operation during back production of the working surface, wherein the escribing shot holes need to be close to the small coal pillar as far as possible, the depth of the escribing shot holes is determined according to the mining height of the back production working surface and the free caving height of the roof of the working surface, the shot holes need to be arranged with a distance away from the working surface, and the distance among the shot holes need to be determined reasonably; then performing explosive filling and hole blocking; performing ahead blasting operation in front of the working surface or lag blasting operation after the shot holes enter a gob area; and instantly performing roadway driving along the gob when the bad influence on the essence of the roadway driving along the gob of the small coal pillar caused by dynamic pressure of the working surface can be basically eliminated when back production of the adjacent working surface is finished. By means of the beside-roadway escribing pressure relief method, normal production of a back production working surface is ensured, and the cost and difficulty in roadway support along the gob are greatly reduced.

Description

technical field [0001] The invention relates to a technique for ensuring the safe driving of small coal pillars along the goaf and the control effect of the surrounding rock of the roadway under the influence of dynamic pressure. The technology of roadway surrounding rock deformation and support difficulty. Background technique [0002] Generally, multiple coal mining faces in the section are mined sequentially. Coal pillars need to be reserved between adjacent working faces to isolate the mined space. The traditional gob-side entry generally starts construction after more than 6 months of mining at the adjacent working face, and the coal pillar is small. In the plastic zone of coal body, roadway maintenance is relatively easy. However, due to the tense excavation replacement, the gob-side roadway is often excavated before or just after the mining of the adjacent working face is completed. Affected by the mining dynamic pressure of the adjacent working face, the surroundi...

AI Technical Summary

Problems solved by technology

[0004] The task of the present invention is to solve the essential defects of the existing small coal pillar gob-side entry technology under the influence of dynamic pressure, and to provide a brand-new small coal pillar goaf-side entry and unloading technology affected by dynamic pressure. This method has the advantages of ensuring the normal production of the mining face and greatly reducing the cost and difficulty of roadway support along the gob

Images