Method for preventing hard top plate type rock burst on basis of carbon dioxide blasting

Abstract

The invention belongs to the technical field of mine safety and particularly relates to a method for preventing hard top plate type rock burst on the basis of carbon dioxide blasting.Firstly, a plurality of sets of drilled holes are formed in the portions, close to the top corner of a work face, of a transport roadway and an air return roadway which are located on the two sides of the work face in the direction of a top plate rock stratum on the inner side of the work face, and carbon dioxide fracturing devices are installed in the drilled holes and used for sequential grouping pre-cracking blasting.Meanwhile, a plurality of parallel drilled holes are formed in the top of the air return roadway of the work face close to a replaced work face in the direction of the work face, the drilled holes point to the inside of the top plate rock stratum, certain inclined angles are formed between the drilled holes and the air return roadway, pre-cracking blasting is conducted, and roof-cutting blasting of top plate rock stratums on the front side and the side face of the work face.The method can effectively control rock burst appearance under the hosting conditions of the hard top plate rock stratum, plays an important role in prevention of rock burst caused by the hard top plate, and is simple, good in safety, easy to operate, convenient to use and wide in applicability.

Description

technical field [0001] The invention belongs to the technical field of mine safety, and in particular relates to a method for preventing and controlling rock burst of a hard roof type based on carbon dioxide blasting. Background technique [0002] The liquid carbon dioxide blaster is a device that uses liquid carbon dioxide to heat, vaporize and expand, quickly releases high-pressure gas and releases enough blasting energy to break rocks or falling coal, and replaces detonators in traditional coal mining or deep hole pre-splitting blasting. Blasting mining and pre-splitting have the disadvantages of high destructiveness and high risk of ore body crushing. It has the advantages of no sparks, no gun smoke, high blasting power, and can be used repeatedly. And pre-splitting provides reliable guarantee, widely applicable to coal mines and non-coal mines. [0003] In many mining areas in my country (such as Datong mining area, Shuozhou mining area, Yulin Shendong mining area, etc...

AI Technical Summary

Problems solved by technology

Although this method of preventing roof impact avoids the generation of rock burst caused by roof impact, it needs to excavate a roof roadway in the roof, and the cost is relatively high.

The traditional way to deal with the hard roof is to use explosive blasting to force the roof, but this method has great potential safety hazards for high-gas mines. No matter the goaf of the adjacent working face or the goaf of this working face may gather a lot of gas

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