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

A technology of complex geology and mining methods, applied in underground mining, surface mining, earth-moving drilling and other directions, can solve the problems of increasing mining costs, difficulty in achieving mineral output, increasing stripping equipment, etc., and achieves wide practicability and stable production. The effect of stripping ratio and reducing mining cost

Active Publication Date: 2016-07-20
CHINA UNIV OF MINING & TECH
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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 in

Method used

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

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Embodiment Construction

[0017] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

[0018] Such as figure 1 , figure 2 , image 3 Shown: In the case of complex geological structure, the end-side and slow-side mining method in the parallel mining area, the specific steps are as follows:

[0019] a. When the coal seam 5 in the open-pit mine changes from nearly horizontal to inclined downward along the advancing direction, the stripping step 4 is stripped in advance on the original coal mining face 1 in a mining area to obtain a large amount of recoverable coal;

[0020] b. Establish a new coal mining face 2 at the end and side of the original coal mining face 1, advance along the direction perpendicular to the original advancing direction of the coal mining face 1 in the first mining area, and open up a new mining area in the second mining area Coal working face 2, coal mining step 3 is mined at the same time, so that the two working ...

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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...

Claims

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Application Information

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IPC IPC(8): E21C41/28
CPCE21C41/28
Inventor 周伟尚涛王晋辉
Owner CHINA UNIV OF MINING & TECH
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