Safe recovery method of isolated island working face under complex conditions

Abstract

The invention relates to a safety recovery method of an island working surface under a complicated condition. An innovated manner of pre-discharging before mining and mining while discharging is adopted, and normal recovery of the working surface is not influenced by deposited water of a goaf. Other relative rock burst prevention and treatment methods including drilling and pressure relief, bottom plate pressure relief and blasting, coal seam water injection and the like are adopted by rock burst prevention and treatment, so that the accuracy degree of predication is improved, the possibility of rock burst is reduced and guarantees are provided for the normal recovery of the working surface. A working surface mining stopping position is comprehensively determined by adopting a manner of combining adjusting slope of tail mining of the working surface and avoiding a periodic pressure position, the length of the working surface is in a cutting range of a coal mining machine and the two ends of the working surface avoid the periodic pressure position, and the middle part of the working surface does not avoid the periodic pressure position.

Description

technical field [0001] The invention relates to a mining method of a coal mine working face, in particular to a safe mining method of an isolated island working face under complex conditions. Background technique [0002] In isolated island working faces, there are generally two troughs and mine pressure in the working face are relatively serious, and there are many goafs on both sides of the working face with accumulated water, and the conditions of the working face are complex. Like Coal Group Xinzhou Kiln Mine 11 # The 8101 working face in the first panel east of the floor is an isolated island working face, 20 meters away from Lane 5101 is the goaf of 8103 working face, and 23 meters away from the cutting eye of the working face is the original 11 # The 8312 working face goaf in the east second panel area of ​​the floor, 30 meters away from Lane 2101 is the original 11 # In the goaf area of ​​the 302 panel, there is water accumulation in the goaf area on both sides of ...

AI Technical Summary

Problems solved by technology

Like Coal Group Xinzhou Kiln Mine 11 # The 8101 working face in the first panel east of the floor is an isolated island working face, 20 meters away from Lane 5101 is the goaf of 8103 working face, and 23 meters away from the cutting eye of the working face is the original 11 # The 8312 working face goaf in the east second panel area of ​​the floor, 30 meters away from Lane 2101 is the original 11 # In the goaf area of ​​the 302 panel, there is water accumulation in the goaf area on both sides of the working face, and the mine pressure in the two parallel grooves and the working face is relatively serious, and the conditions of the working face are relatively complicated, which brings great difficulties to the mining of the working face

Images