Method for improving recovery rate of fully mechanized top coal caving

A recovery rate and top-coal technology, applied in earthwork drilling, surface mining, underground mining, etc., can solve problems such as reduced resource recovery rate, large step distance of top-coal collapse, roof control, fire prevention and safety hazards, etc. Achieve the effect of reducing dust production, reducing spillage and improving the production environment

Inactive Publication Date: 2015-04-01
SHANDONG UNIV OF SCI & TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

During the initial mining process of fully mechanized caving, the initial top-coal caving step is relatively large, and a part of the top-coal is lost, resulting in a reduction in the recovery rate of resources, and brings safety hazards to roof control, fire prevention and extinguishing, etc.

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  • Method for improving recovery rate of fully mechanized top coal caving
  • Method for improving recovery rate of fully mechanized top coal caving

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Embodiment Construction

[0012] Implementation of the present invention will be further described below in conjunction with accompanying drawing:

[0013] Taking a mine as an example, according to the geological data of the fully mechanized caving face measured in this coal mine and the mine pressure data of the adjacent mining face, it is known that the average buried depth of the level roadway is 810m, the average coal thickness is 9.03m, and the coal seam dip angle is 2~5m. °, coal seam joints and fissures are developed. The top of the coal seam consists of 2.35m siltstone, 12.42m siltstone and 5.82m siltstone from bottom to top. The length of the cut hole in the fully mechanized caving face is 220m, and the rolling step distance of the old top cycle is 23m.

[0014] Because neither the old roof nor the direct roof produces pressure on the top coal of the working face during initial mining, it is difficult for the top coal to fall automatically by its own weight. When no measures are taken on the...

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Abstract

The invention relates to a method for improving the recovery rate of fully mechanized top coal carving, comprising the following steps: arranging boreholes in open-off cut and upper and lower drifts before the production of a working surface and performing dynamical pressure water injection in the cut holes and the boreholes of the upper and lower drifts according to water injection pressure of more than 200MPa, wherein the cut boreholes are parallelly arranged along the direction of the open-off cut, the hole distance between the cut boreholes is smaller than or equal to 10m, the hole depth is larger than or equal to 22m, the included angle between each cut borehole and a top roof is 75-80 degrees, and the drift boreholes are arranged in the upper and lower drifts being away from front of the coal wall of the working surface by 5m; a vertical drift in the upper and lower drifts is provided with a group of boreholes respectively from bottom coal to top coal, the hole distance of each group of boreholes is smaller than or equal to 2m, the hole depth is larger than or equal to 92m, the distance from the orifice of each drift borehole to a bottom plate is larger than 1m, and the included angle between each drift borehole and the top roof is 5-9 degrees.

Description

technical field [0001] The invention relates to a method for improving the top coal recovery rate of a fully mechanized caving face and reducing the mining loss of coal resources. Background technique [0002] Fully mechanized top-coal caving technology has become an important technical means and method for my country's coal mining enterprises to achieve high production and high efficiency, and it is also an important direction for the development of coal mining in the future. How to increase the recovery rate of coal resources and reduce the loss of coal resources in the fully mechanized caving face has become a technical problem to be solved urgently by various mining enterprises. During the initial mining process of fully mechanized caving, the initial caving step of the top coal is relatively large, and a part of the top coal is lost, resulting in a reduction in the recovery rate of resources, and brings safety hazards to roof control, fire prevention, and other aspects....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/16
Inventor 郭忠平胡善超张涛刘坤
Owner SHANDONG UNIV OF SCI & TECH
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