Continuous propulsion mining method for converting fully mechanized caving into fully-mechanized mining for large-inclination-angle split coal seam

Abstract

The invention discloses a continuous propulsion mining method for converting fully mechanized caving into fully-mechanized mining for a large-inclination-angle split coal seam. The method comprises three stages of fully mechanized caving mining, fully mechanized caving converted upper fully mechanized slicing mining and lower fully mechanized slicing mining. According to the method, a haulage andair return roadway is dug along a roof of the coal seam, the open-off cut and equipment layout of a fully mechanized caving face is carried out to form a ventilation system, the position of a climbingline is determined according to the influence rule of the dirt band characteristic on the capability of top coal caving and the principle of two shortest lengths and one largest angle, when the fully-mechanized caving face is pushed to the climbing line, a working face starts to perform overhand mining, the coal caving step is canceled and is converted into a fully-mechanized coal mining process,the working face penetrates through a dirt band layer until coal winning is finished, two roadways of a lower fully mechanized slicing mining face are arranged in a decompression area after overlyingstrata move to be stable, meanwhile, the width of the lower slicing open-off cut protective coal pillar and the open-off cut position are determined, and a lower slicing mining system is formed. Themethod has the advantages that the technical problem of complicated geological conditions for converting fully mechanized caving to fully mechanized mining of the split coal seam can be effectively solved, the remaining amount of the coal pillar is decreased, and the method is simple to implement and low in cost and has good popularization value.

Description

Technical field [0001] The invention relates to a continuous advancing mining method for fully mechanized caving to fully mechanized mining in a large inclination bifurcated coal seam, belonging to the technical field of thick coal seam mining. Background technique [0002] Thick coal seams (above 3.5m) are the main production coal seams in my country's coal production capacity, accounting for about 45% of the total production capacity, and are mainly distributed in Shanxi, Shaanxi, Inner Mongolia and Xinjiang. There are various conditions for the occurrence of thick coal seams. A large number of thick coal seams belong to inclined coal seams or even steep coal seams. At present, there are three main mining techniques for thick coal seams, namely, large mining height, full height mining at one time, top coal caving and slicing mining. Under the current technical level, the maximum mining height of the full height at one time with the large mining height is 8.8m, which is applied ...

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Problems solved by technology

[0003] Technical problem: the purpose of the present invention is to overcome the deficiencies in the prior art, and provide a method for continuously propelling mining from fully mechanized caving to fully mechanized mining in a bifurcated coal seam with a large inclination angle, so as to solve the unexpected problems encountered in the recovery process of a fully mechanized caving and thick coal seam with a large inclination angle. The difficult problem of complex geological conditions in which the thickness of the gangue in the coal seam is greater than the thickness of the gangue that can be placed, effectively improves the recovery rate of coal resources, and further strengthens the efficient and safe mining of coal resources

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