Progressive bedding hydraulic cave-making construction method in single-cline coal seam recovery working face

Abstract

The invention belongs to the technical field of hydraulic hole-making construction, and in particular relates to a progressive layer-by-bed hydraulic hole-making construction method for a monoclinic coal seam recovery working face. Include the following steps. S1: Arrange the mining face along the direction of the monoclinic coal seam, construct the bedding drilling I from the deep air tunnel of the mining face to the lower area of ​​the working face, and use the high-pressure water jet as the driving force during the back drilling process. Carry out hydraulic cavitation once at a certain distance; S2: After the hydraulic cavitation in the lower area of ​​the working face is completed, the bedding borehole I is efficiently sealed, so as to drain the pressure relief gas in the lower area of ​​the working face; S3: In the remaining On the premise of a reasonable drilling lead distance, excavate the waist roadway in the middle of the mining face; S4: move the drilling and punching integrated drilling rig to the waist roadway in the middle of the mining face, and construct the bedding drilling II to the upper area of ​​the working face, And carry out bedding hydraulic cave creation; S5: seal the bedding borehole II, and drain the pressure relief gas in the upper area of ​​the working face.

Description

technical field [0001] The invention belongs to the technical field of hydraulic hole-making construction, and in particular relates to a progressive layer-by-bed hydraulic hole-making construction method for a monoclinic coal seam recovery working face. Background technique [0002] my country's energy structure is characterized by "rich coal, poor oil and little gas". The research report "China's Sustainable Energy Development Strategy" shows that before 2050, the proportion of coal in my country's primary energy consumption will remain above 50%. However, during the coal-forming process of coal-bearing strata in my country, they generally experienced three phases of geological tectonic movements in the Indosinian, Yanshanian and Himalayan periods, resulting in the extensive development of soft and low-permeability coal seams, and the low gas extraction efficiency of the mining face. Gas outburst disasters occur frequently. [0003] In order to strengthen the gas drainage...

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Problems solved by technology

[0005] The present invention solves the problem that when the single-slope coal seam recovery working face adopts the construction method of machine-air tunnel on both sides of the bedding hydraulic hole-making method, downward drilling is likely to occur on one side of the working face, resulting in difficulties in drainage and slag discharge of the drilling holes and poor gas extraction efficiency. In order to solve the low-level problem, a construction method of progressive layer-by-bed hydraulic cavitation in monoclinic coal seam recovery working face was proposed.

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