Advanced pre-splitting method for lump coal mining

Abstract

The invention discloses an advanced pre-splitting method for lump coal mining. The method with carbon dioxide pre-splitting and hydraulic fracturing combined is adopted, advanced pre-splitting of a working face is carried out on a coal layer needing mining in a multi-segmental mode from near to far in the advancing direction of the coal layer working face. The advanced pre-splitting method for every segment comprises the first step of hole drilling, wherein pre-splitting drill holes are drilled in the current pre-split segment; the second step of carbon dioxide pre-splitting, wherein a carbon dioxide pre-splitting device is installed in each drilled pre-splitting drill hole, the drill holes are sealed, and then pre-splitting is initiated; the third step of installation water injection pipes, wherein each pre-splitting drill hole is internally provided with one high pressure water injection pipe, and the holes are sealed; the fourth step of hydraulic fracturing, wherein water is injected into the pre-splitting drill holes through the high pressure water injection pipes to carry out hydraulic fracturing. According to the method, steps are simple, design is reasonable, the method is easy to implement and good in use effect, the problems that an existing deep hole blasting pre-splitting method is not safe, serious in pollution, high in investment cost, poor in use effect and the like are effectively solved, and the lump coal rate of a fully mechanized coal mining face is improved effectively.

Description

technical field [0001] The invention belongs to the technical field of coal seam mining, in particular to an advanced pre-splitting method for lump coal mining. Background technique [0002] Because the production of lump coal is affected by many factors such as the strength of the coal seam itself, geological conditions, coal mining technology, and reloading process, the output only accounts for about 10% to 30% of the total output of raw coal. In the process of coal transportation, due to the difference in the drop of the transfer point and the way of coal falling, the lump coals collide with each other when they fall, causing serious loss of lump coal, and the lump coal rate drops by more than 20% to 30% during the transportation process. Therefore, under the mining process conditions of the existing fully mechanized mining face, the coal body is excessively crushed, and the production lump coal rate of the whole mine is low. According to statistics, the lump coal produc...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an advanced pre-cracking method for lump coal mining in view of the deficiencies in the above-mentioned prior art. The pre-splitting method of deep hole blasting has problems such as unsafe, serious pollution, high input cost, and poor use effect

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