A method for pressure relief and permeability enhancement of coal seam area slices based on the principle of "mining protective layer"

Abstract

The invention belongs to the technical field of coal mine safety, and relates to a coal seam area slicing pressure relief and anti-reflection method based on the principle of "mining protective layer". The coal body is cut by reciprocating movement of the head of the slicer along the direction of the vertical groove; The coal is transported out through the scraper conveyor; the cutting boundary of the slicer moves at a certain speed to the direction of the opening of the mining face with the heading head, so that the coal body in the rear area can be fully recovered due to the free space of 200-300mm cut by the slicer. Pressure relief, the original gas pressure of the coal seam drops to close to zero (gauge pressure), and the air permeability coefficient will increase by more than two orders of magnitude; the method of pressure relief and permeability enhancement in the section of the coal seam can fully relieve the pressure of the outburst coal seam, and solve the problem of unprotected outburst coal seams. For those outburst mines that can only use coal seam drilling to pre-extract coal seam gas as a regional outburst prevention measure, it provides a new solution to the regional outburst prevention technology.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and relates to a method for reducing pressure and increasing permeability of coal seam area slices based on the principle of "mining protective layer". Background technique [0002] Coal and gas outburst is a type of special gas gushing phenomenon, that is, under the action of pressure, the broken coal and gas are suddenly ejected from the coal body to the mining space in large quantities. Coal and gas outburst is a powerful natural disaster in underground coal mine production, which seriously threatens the safety of coal mine production and is extremely destructive. [0003] The deep coal seams of my country's coal mines have the characteristics of "high in-situ stress, high gas pressure and low permeability". At present, in order to prevent and control coal and gas outburst and coal-rock gas dynamic disasters, mining protective layers and pre-draining coal seam gas are mainly used. Th...

AI Technical Summary

Problems solved by technology

At present, for the prevention and control of coal and gas outburst and coal-rock gas dynamic disasters, the mining protection layer and pre-pumping of coal seam gas are mainly used. gas dynamic disaster

Moreover, in actual coal mining, there are not many outburst mines that meet the conditions for mining protective layers. Since the founding of New China, there have been very few outburst mines that have the conditions for mining protective layers and have achieved good results. However, there are hundreds of outburst mines in my country. That is to say, most outburst mines cannot use protection layer mining measures to eliminate outbursts, and can only use the relatively ineffective method of pre-extracting coal seam gas

Images