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Method for preventing impact cracking of hard roof by remote fixed-point air cannon

A technology of hard roof and air cannon is applied in the field of pressure relief and anti-scouring in rockburst mines, which can solve the problems of high fracturing cost, uncontrollable direction of fracturing, and impact on the protective layer that is difficult to mine in mines. The effect of reducing economic costs

Pending Publication Date: 2021-06-29
ANHUI UNIV OF SCI & TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

The current regional fracturing and pressure relief technologies mainly include technical measures such as long-hole fracturing and exploitation of protective layers, but it is difficult to exploit the protective layer in impact mines, and the long-hole fixed-point hydraulic fracturing technology has high fracturing costs , uncontrollable cracking direction, etc.

Method used

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  • Method for preventing impact cracking of hard roof by remote fixed-point air cannon
  • Method for preventing impact cracking of hard roof by remote fixed-point air cannon

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Embodiment Construction

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0025] A method for impacting cracking and anti-scouring of a remote fixed-point air cannon for a hard roof, the steps are as follows:

[0026] 1. In the floor roadway of the mine, construct a number of roof fracturing boreholes 3, so that the roof fracturing boreholes 3 are located in the hard roof 2 above the mined coal seam 1;

[0027] 2. Feed the casing 4 into the roof fract...

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Abstract

The invention provides a method for preventing impact cracking of a hard roof by a remote fixed-point air cannon. In a certain range of an advanced working face, the hard roof is cracked by adding water into the air cannon, the energy of the air cannon is efficiently transferred by using the incompressibility of the water, and meanwhile, the air cannon can continuously release high-pressure gas, so that transient impact waves continuously occur, and continuous damage and cracking of roof rock are realized; and in addition, when the air cannon is released, the direction of the impact waves is mainly the direction of a pressure relief opening, so that directional cracking is realized. The method can effectively prevent threats caused by rock burst disasters, and is simple in process, low in cost, safe, reliable and extremely high in efficiency.

Description

technical field [0001] The invention relates to a method for pressure relief and anti-scouring of rock burst mines, in particular to a method for anti-scouring caused by impact of remote fixed-point air cannons on hard roofs. Background technique [0002] Most of the coal mines in our country have entered the deep part, and the deep mining is faced with the characteristics of "three highs and one disturbance", which leads to the great threat of rock burst disasters in mining activities. In order to eliminate or weaken the rockburst disaster in mine, it is an effective method to relieve the pressure of the mine's rockburst source. [0003] The hazard sources of rock burst mines are generally coal pillars, hard roofs and structures. The hard roof is generally located above the mining coal seam. When the roof breaks, a strong dynamic load will be generated and applied to the mining area, resulting in rock burst accidents. In order to ensure the safety of roadway excavation and...

Claims

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Application Information

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IPC IPC(8): E21C41/16E21C37/14
CPCE21C41/16E21C37/14
Inventor 马衍坤谭辉邓子墨杨志良闫梦
Owner ANHUI UNIV OF SCI & TECH
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