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

A technology for expanding sidewall gas and gas drainage, which is applied in the field of gas drainage and recovery roadway support, can solve the problems of affecting the efficiency of mining roadway excavation, large section span of recovery roadway, and large amount of manual construction, so as to facilitate support and roadway support. The effects of maintenance, reducing the strength of surrounding rock, and reducing the amount of construction

Inactive Publication Date: 2012-07-18
CHINA UNIV OF MINING & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the traditional method achieves the expected effect of gas drainage in the coal seam or the coal seam adjacent to the roof and floor, the section span of the mining roadway in the expansion stope section is large, the support is difficult, and the maintenance is difficult. At the same time, there are many interference factors that are prone to occur.
In addition, in the traditional drilling field, it is difficult to form the excavation roadway excavation machinery at one time, and often requires manual secondary forming, which requires a large amount of manual construction and a long construction time; due to poor anti-interference ability, it is greatly affected by interference factors. Before the field is formed and supported, it is not suitable to continue mining roadway excavation, which affects the efficiency of mining roadway excavation and delays the construction period

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

[0026] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0027] Such as figure 1 Shown, the arrangement of the present invention's extended side gas drainage drilling site:

[0028]The layout of the expanded gas drainage drilling site of the present invention: firstly, according to the conventional technology, the mining roadway is excavated by the method of fully mechanized excavation or gun excavation, and then a plurality of wedge-shaped tunnels are staggered in front and rear in the two sides 2 of the mining roadway 3 Stepping drilling site 1, the distance between the front and rear staggered drilling site 1 is not less than 2m, the span of the stepping drilling site 1 gradually increases along the excavation direction of mining roadway 3, and its span is 0.5~3 m, and the excavation along mining roadway 3 The length in the direction is 3~8 m, and the distance between adjacent stepping drilling sites 1 is 60~...

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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...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21D15/44E21D21/00E21D11/10
Inventor 郑西贵张农刘玉栋阚甲广张磊曹栩
Owner CHINA UNIV OF MINING & TECH
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