How to use the water injection weakening experimental device for hard coal seam

Abstract

The present invention relates to a hard coal seam water injection weakening experiment device and its use method. It is equipped with a double-end sealing fracturing device, and the double-end sealing fracturing device includes a packer, and the packer includes a spacer along its length direction. Distributed, flexible connection of the outer packer and the inner packer, so after the outer packer and the inner packer are pressurized, the sealing section between the outer packer and the inner packer forms a closed space, Injecting water into the coal body in the fracturing section through the high-pressure water injection pump can solve the technical problem of being unable to maintain the pressure that often occurs during high-pressure water injection in deep holes, and create conditions for the subsequent low-pressure infiltration of coal seams. The structure is simple and the water injection effect is good. Water injection and pressure maintenance ensure low-pressure infiltration, thereby effectively weakening the coal seam, reducing the consumption of picks, and fundamentally solving the problem of using mechanized mining in harder coal seams.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a hard coal seam water injection weakening experimental device and a use method thereof which are suitable for mine underground engineering. Background technique [0002] According to the hardness, the coal seam is divided into five categories: extremely hard coal seam 5.0>f>4.0, hard coal seam 4.0>f>3.0, medium hard coal seam 3.0>f>1.5, soft coal seam 1.5>f>0.8, and extremely soft coal seam 0.8>f>0.5 , and the coal cutter is generally suitable for the working face with the hardness f≤4 of the coal seam. [0003] In the production of hard coal seams, due to the hard coal body of mechanized coal mining, it is very difficult for the shearer to cut the coal, and usually the phenomenon of not cutting the coal occurs, which not only increases the consumption of picks, but also often causes For mechanical accidents of coal shearers, in production prac...

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Problems solved by technology

[0003] In the production of hard coal seams, due to the hard coal body of mechanized coal mining, it is very difficult for the shearer to cut the coal, and usually the phenomenon of not being able to cut the coal occurs, which not only increases the consumption of picks, but also often causes For mechanical accidents of coal shearers, in production practice, the method of vibrating the coal side and the coal wall is usually used to make the coal seam soft, and then the coal is cut by the coal shearer. There are also methods of water injection through shallow holes in the coal body and deep holes The method of water injection, but the water injection effect is not ideal, and the problem of being unable to maintain the pressure often occurs, which cannot fundamentally solve the problem of using mechanized mining in hard coal seams

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