Huge thick hard roof high gas thick coal seam roof control and gas drainage efficiency improvement method and drilling machine

Abstract

The invention discloses a huge thick hard roof high gas thick coal seam roof control and gas drainage efficiency improvement method and a drilling machine. The method includes: firstly constructing two crossheadings (1) along the roof in the mining coal seam, and constructing a gas high drainage roadway (2) at certain distance away from the mining coal seam top; constructing angular groove blastholes (3) and round holes (4) on two sides of the gas high drainage roadway (2) and a base plate, with the angular groove blasthole (3) comprising a round blasthole, and two ends of the round blasthole diameter being equipped with two angular groove (5); filling the angular groove blastholes (3) with explosive, and filling the bottom of the round holes (4) with 2-3 length explosive, thus finishing deep hole block blasting operation. The invention adopts the deep hole block blasting method to integrate hard roof control and coal seam permeability increase, and gas drainage efficiency improvement, and the while caving pace of the roof is effectively controlled, the coal seam air permeability is enhanced, the crack channel between the coal seam and the gas high drainage roadway is increased, and the gas drainage efficiency of the high drainage roadway is improved.

Description

technical field [0001] The present invention relates to the control technology of extremely thick and hard roof, in particular to a method for controlling the roof of extremely thick and hard roof, high gas and thick coal seam, and gas drainage, and a drilling tool thereof. Background technique [0002] In my country, about one-third of coal seams in mining areas belong to hard roofs, distributed in more than 50% of mining areas, such as Beijing, Datong, Hegang, Yima, Zaozhuang, Tonghua, Shenfu, Urumqi, Jincheng, Lu'an, Yanzhou The coal seams of mines such as mines have very thick and hard roofs, and the lithology is mainly sandstone and conglomerate. After the coal seams are mined, a large area of ​​suspended roofs is formed, which forms the typical roof conditions for rock burst. When the mining coal seam is thick, the huge thick and hard roof can form a large area of ​​suspended roof in the goaf, which is not easy to collapse naturally in a short period of time. The initi...

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Problems solved by technology

[0004] The existing technology separates hard roof control and gas drainage, which generally takes a long time and is slow to take effect, affecting the normal production of coal mines, high cost, and the treatment effect is not obvious, and the problem of gas drainage is difficult to control and easy to repeat. features

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