Methods for arranging and supporting wall-expanded gas extraction drill sites

Abstract

The invention discloses methods for arranging and supporting wall-expanded gas extraction drill sites. A plurality of wedge-shaped walking drill sites are arranged in two walls of a stoping tunnel in a staggering manner; the spans of the walking drill sites are gradually increased along the tunneling direction of the stoping tunnel; 1 to 3 rows of extraction drilled holes are formed in the fractured zone of the local coal layer or the coal layers adjacent to a top plate and a base plate of the inner wall of each walking drill site; a hole protection tube is arranged at the orifice of each extraction drilled hole, and a gas extraction tube connected with each hole protection tube is arranged; and the spans of the drill sites are gradually increased along the tunneling direction of the stoping tunnel and distributed in the two walls of the stoping tunnel in a staggered walking manner. Due to the wedge-shaped structure, an enough working space is supplied to drilling machinery and gas extraction equipment; furthermore, the drill site construction amount is reduced greatly, and the construction difficulty is reduced; due to the staggered walking distribution and the wedge-shaped structure, the span is reduced greatly, and supporting and maintenance are facilitated; and moreover, extraction and tunneling of the stoping tunnel can be performed at the same time, the tunneling efficiency is improved, and relatively high economic benefit is achieved.

Description

technical field

[0001] The invention relates to an arrangement and support method for an expanded gas drainage drilling site, and is especially suitable for gas drainage and recovery roadway support in the coal seam or the coal seams adjacent to the roof and floor in gas outburst mines. Background technique

[0002] my country is a large coal-based energy consumption country. Almost 95% of the coal resources come from underground mining. The coal seam occurrence conditions are complex and changeable, and power disasters such as gas and dust explosions, coal and gas outbursts, and roof caving occur from time to time. . Among the three major disasters of coal mine roof, gas and water, gas accidents account for the highest proportion of major accidents, and gas disasters are the biggest threat to restrict coal mine production. Among the mineable coal seams in our country, soft and low-permeability coal seams occupy an absolute proportion, and with the continuous extension of co...

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