Method for weakening hard waste rock inclusion layer in coal seam through hydraulic presplitting in underground coal mine deep hole

Abstract

The invention discloses a method for weakening a hard waste rock inclusion layer in a coal seam through hydraulic presplitting in an underground coal mine deep hole. The method comprises the followingsteps of Step 1, determining the occurrence form and range of the hard waste rock inclusion layer in a stope face; Step 2, determining drilling hole arrangement parameters and fracturing technical parameters; Step 3, performing drilling construction; and Step 4, performing in-hole conveying of fracturing equipment and fracturing construction. The method can overcome the defects and existing problems of an existing technology for weakening a hard waste rock inclusion layer in a coal seam, the effect of weakening the hard waste rock inclusion layer in more environmental-friendly, safer and moreefficient way is achieved, advanced weakening of the hard waste rock inclusion layer in an underground coal mine stope face is achieved, smooth recovery of a whole set of construction equipment for presplitting in the deep hole is completed, the fracturing construction efficiency is guaranteed, and technical defect problems existing in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of safe production in coal mines, in particular to the technical field of weakening a large-scale hard gangue layer existing in coal mining working faces, and specifically relates to a method for deep hole hydraulic pre-cracking in coal mines to weaken the hard gangue layer in coal seams . Background technique [0002] With the advancement of science and technology, the underground mining of coal seams in coal mines has entered the era of comprehensive mechanization. When mining coal seams with large-scale hard interlayers, especially for fully-mechanized mining faces with hard interlayers distributed over the entire length of the working face, it will be difficult to Seriously affect the coal cutting speed of the coal cutter, and then affect the recovery rate and coal output rate of the coal mining face. The major constraints and hidden dangers are major problems that need to be solved urgently in the fron...

AI Technical Summary

Problems solved by technology

The deep hole blasting process is complicated, and the operation requirements are extremely high. A slight improper construction operation can easily induce secondary disasters; the workload is too large and the operation period is long; Afterwards, a large amount of dust and harmful and toxic gases will be produced, which is seriously polluted and not environmentally friendly; the control of pyrotechnics is relatively strict, and when the pyrotechnics are operating, there is a certain safety hazard to the mining production of the working face

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