Alternate shielding bedding drill hole hydraulic flushing and cave making construction method for stope face

Abstract

The invention discloses an alternate shielding bedding drilling hydraulic flushing and cave making construction method for a stope face. The method comprises the steps that multiple bedding drill holes are constructed in the whole stope face sequentially, a drill is drawn out when being clamped in the construction process, caves are made at intervals in the drill drawing process, pressure is relieved for coal along the drilled holes through cave making, and hole sealing and gas extraction are carried out after cave making pressure relief is completed; the next drill hole is constructed in the cave making pressure relief area, so that the construction distance of the drilled holes is gradually increased till the drilled holes are constructed to the designed depth; and after a certain drilled hole is constructed to the designed depth, the following drilled holes can be constructed to the designed depth under shielding of the last drilled hole, and the previous drill holes which are not constructed in place can also be reconstructed to the designed depth in a supplementary mode. By means of the method, smooth construction of a bedding drill hole hydraulic flushing, cave making and gas extraction process for the stope face of a soft low-seepage coal bed can be ensured, all the drill holes can be constructed to the designed depth, and no blind gas extraction area is left.

Description

technical field [0001] The invention relates to gas drainage technology in soft and low-permeability coal seams, in particular to a construction method for drilling holes by hydraulic punching along layers of an alternate cover type recovery working face. Background technique [0002] my country's coal-bearing strata are mostly Jurassic and Carboniferous Permian. Most coal seams are low-permeability soft coal seams. Many mining areas have experienced multi-stage uplifts, depressions, folds, and faults. Under stress, the geological conditions are extremely complex, and in some hard coal mining areas, there are also local structural failures, resulting in the development of structural coal, which is characterized by soft coal quality, poor coal seam permeability, and difficulty in gas drainage from the original coal body. my country's coal-bearing strata mostly exist under the conditions of coal seam groups, which extend to the deep year by year with the increase of mining inte...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The present invention is aimed at the problem that the construction is affected by the frequent drilling phenomenon during the construction process of the soft and low-permeability coal seam by drilling hydraulic punching holes to create holes, and proposes an alternate cover type mining face along the Layer drilling hydraulic punching hole construction method, through this method can complete the bedding drilling hydraulic punching hole creation of the entire mining face, so that the gas can be efficiently extracted from the soft and low-permeability coal seam working face to ensure the safety of the mine Production

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