A method of preventing and controlling coal and gas outburst by blasting

Abstract

The invention provides a method for preventing coal and gas outburst by blasting, which comprises: drilling holes; at least one guide hole for guiding the propagation direction of explosion energy is opened on the wall of the duct; Install at least one charge pack with a detonating device installed inside; the guide hole and one of the charge packs are located in the same conduit part; after each charge pack detonation device is connected in series with wires, the wires are led out of the conduit; water is injected into the borehole to the orifice ;Insert the pipe of the fixed medicine bag and the cement gun into the drill hole filled with water slowly and smoothly; detonate each medicine bag, use the blasting energy of the medicine bag and the effect of damage and earthquake, under the guidance of the guide hole, Cracks are formed in the coal body in a specific area according to a certain extension direction, thereby forming a gas extraction channel; regularly start the gas extraction equipment, and extract gas to the outside through the gas extraction channel to reduce the risk of gas outburst. It has the advantages of wide application range, low construction cost and convenient construction.

Description

technical field [0001] The invention relates to a method for preventing and controlling coal and gas outburst, in particular to a method for preventing and controlling coal and gas outburst by blasting. Background technique [0002] In the process of underground mining, coal and rock are often thrown out of the coal body in an instant, accompanied by a large amount of gas ejection. This phenomenon is called coal and gas outburst, or "outburst" for short. Coal and gas outburst accidents will not only cause damage to the mining face and ventilation system, but at the same time, a large amount of coal and gas will be ejected at an extremely fast speed, and may also fill the roadway, causing suffocation and gas explosion, endangering the lives of underground workers . Therefore, how to effectively prevent and control coal and gas outburst has important practical significance. [0003] In the prior art, the methods for preventing coal and gas outburst mainly include: mining the...

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Problems solved by technology

[0004] The method of mining the liberated seam mainly has the following limitations: (1) the liberated range of the liberated seam is limited; (2) it is only applicable to a specific coal seam with a large difference in risk between adjacent coal seams, and the scope of use has certain limitations; ( 3) It has the problems of high construction cost and inconvenient construction

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