Gas extraction system and method for thick and hard roof high-gas coal seam

A coal seam gas and gas drainage technology, which is applied in the field of thick and hard roof and high gas coal seam gas drainage system, can solve the problems of damage to the integrity of thick and hard roof and the influence of advancing speed, and achieve high construction efficiency, high implementation efficiency, and high construction efficiency. The effect of simple structure composition

Pending Publication Date: 2021-07-13
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of this application, using the technical means of deep hole blasting to relieve pressure, can effectively destroy the integrity of the thick and hard roof and reduce the hazards of the thick and hard roof. speed still makes a difference

Method used

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  • Gas extraction system and method for thick and hard roof high-gas coal seam
  • Gas extraction system and method for thick and hard roof high-gas coal seam
  • Gas extraction system and method for thick and hard roof high-gas coal seam

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Experimental program
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Effect test

Embodiment 1

[0041] For high-gas mines, the amount of gas gushing out from coal seams is large during the mining process, and the risk of coal and gas outburst is high, which seriously threatens the safety of roadway operations in the working face. In the process, the overhanging area of ​​the basic roof is large, and pressure from too long a distance will cause a rock burst accident, which also seriously threatens the safe and efficient production of the mine.

[0042] In the existing technology, for mines with both thick and hard basic roof and high gas, two independent treatment methods are used to deal with them separately, and the construction location and construction structure are not related to each other. For the elimination of thick and hard basic roof, the Reasonable setting of coal pillars, deep hole blasting and roof cutting for pressure relief, etc., both of which require relevant operations after mining at the working face; The roof of the upper part of the coal seam is dril...

Embodiment 2

[0048] This embodiment provides a gas drainage method for a thick, hard roof and high gassy coal seam, based on the gas drainage system for a thick and hard roof and high gassy coal seam in Example 1, the steps are as follows:

[0049] 1. Set up a large borehole. Before the mining of the working face, arrange a gas machine room on the ground, open a large borehole 1 vertically downward from the ground next to the gas machine room, and reinforce the large borehole 1 to ensure that it can It will be used for a long time until the blasting and pressure relief work of the basic roof and the gas drainage work are completed, and the large borehole 1 will be opened to the position of the hard rock formation 4 of the basic roof;

[0050] 2. Set up blasting drill holes. From the bottom 10 of the big drill hole 1, a number of blast drill holes 5 are extended along the circumference. The blast drill holes 5 are divergent and evenly opened at 4 hard rock formations on the basic top. Subseq...

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Abstract

The invention discloses a gas extraction system and method for a thick and hard roof high-gas coal seam, and belongs to the technical field of coal mining. The gas extraction system comprises a gas machine room arranged on the ground, a large drill hole, a plurality of blasting drill holes, a gas extraction drill hole and a plurality of branch extraction drill holes, and the large drill hole is vertically and downwards formed from the ground to a basic top hard rock stratum; the multiple blasting drill holes extend from the hole bottom of the large drill hole in the circumferential direction and are formed in the basic top hard rock stratum; the gas extraction drill hole is formed below the large drill hole; the multiple branch extraction drill holes extend from the bottom of the gas extraction drill hole in the circumferential direction and are formed in the coal seam; and explosive is arranged in the blasting drill holes, and the branch extraction drill holes communicate with the gas machine room. The gas extraction system is implemented before the working face is mined, only one drill hole needs to be formed in the ground, and high gas in the coal seam can be effectively utilized; and meanwhile, blasting pressure relief can be carried out on the thick and hard basic roof in the geological area, the safety of the working face in the geological area in the mining propelling process is ensured, and the mining efficiency is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of coal mine mining, and more specifically relates to a gas drainage system and a gas drainage method of a thick hard roof and high gas coal seam. Background technique [0002] Rock burst is a common coal-rock dynamic phenomenon in coal mining. It becomes more and more serious as the depth of coal mining increases. The causes of rock burst are extremely complicated, and thick and hard roofs are one of the important influencing factors; high-gas mine mining The gas pre-drainage of the working face can reduce the gas concentration in the wind flow and improve the safety of mine production. For high-gas mines with thick and hard roofs, in addition to gas drainage, strict monitoring and prevention are also required. Dealing with thick and hard roofs is the fundamental method to prevent mine dynamic disasters. [0003] The commonly used methods to eliminate the overhang of the thick and hard basic roof are reaso...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21F17/00E21C37/00
CPCE21F7/00E21F17/00E21C37/00
Inventor 王方田江振鹏张洋尚俊剑
Owner CHINA UNIV OF MINING & TECH
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