Method for preventing and treating coal and gas outburst by explosion

Abstract

The invention provides a method for preventing and treating coal and gas outburst by explosion. The method comprises the following steps of drilling a hole; forming at least one guiding hole for guiding an explosion energy spreading direction in a wall of a guide tube; sequentially mounting at least one blasting charge with a priming device inside on the bottom of the inner wall of the guide tube from bottom to top; enabling the guiding holes and one of the blasting charges to be positioned on the same portion of the guide tube; guiding a blasting fuse out of the guide tube after the priming devices of the various blasting charges are connected in series through the blasting fuse; injecting water in the drilled hole until water reaches an opening of the hole; slowly and stably inserting the guide tube fixed with the blasting charges and a cement cannon in the drilled hole filled with the water; detonating the various blasting charges so that fractures are generated in coal bodies of a specific region according to a certain extension direction by blasting charge explosion energy and destruction and earthquake effects and under the guiding effect of the guiding holes, and a gas extracting channel is formed; starting gas extracting equipment at regular intervals; and extracting gas outwards through a gas extracting channel so as to reduce gas outburst risks. The method has the advantages of wide application range, low construction cost and good convenience in 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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