Gentle wall milling method at parallel milling area end under complex geological structure

Abstract

Provided is a gentle wall milling method at a parallel milling area end under a complex geological structure. When a coal milling layer of an open coal mine becomes obliquely downwards from the nearly horizontal mode along the advancing direction, advance stripping is conducted on a prior coal working face in advance; a new coal working face of a second milling area is built in the gentle wall position of one side end of the prior coal milling face of a first milling area; advancing is conducted in the advancing direction perpendicular to the prior coal working face, and a high mineable coal quantity can be obtained by conducting advance stripping on the new coal milling face of the second milling area; meanwhile, the stripping speed of the prior coal working face of the first milling area is decreased, and the coal milling speed is increased; when a coal bed of the prior coal working face of the first milling area starts to oblique downwards, the stripping quantity is increased, the coal milling quantity is reduced, the advancing speed is decreased, and the coal milling speed of new coal working faces is increased. The gentle wall milling method is suitable for milling parallel milling area open mines with coal beds becoming obliquely downwards from the horizontal mode in the advancing direction, the overall stability of the stripping ratio for mine production can be maintained, the milling cost is reduced, and economic benefits are increased.

Description

technical field [0001] The invention relates to an open-pit mine mining program, and is especially suitable for adjusting the mining program when a large-scale near-horizontal to inclined coal seam open-pit mine passes through an anticline, which can stabilize the production stripping ratio and ensure mine output. Mining method of end-side and slow-side in parallel mining area under the condition of complex geological structure Background technique [0002] As an important branch of the mining industry, open-pit mining undertakes increasingly important coal mining tasks. Its essence is to strip the overlying strata of the ore body and obtain useful minerals. At present, in the open-pit mines with near-horizontal to inclined coal seams, when the coal seam changes from near-horizontal mining to inclined downward mining, the stripped objects increase and the stripping ratio increases. Not only is it difficult to achieve the expected rated mineral output, but also it is necessar...

AI Technical Summary

Problems solved by technology

At present, in the open-pit mines with near-horizontal to inclined coal seams, when the coal seam changes from near-horizontal mining to inclined downward mining, the stripped objects increase and the stripping ratio increases. Not only is it difficult to achieve the expected rated mineral output, but also it is necessary to increase stripping equipment. cost of mining

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