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Harmonious mining method for block-type dip stripes in deep spanned mining areas of steep inclined seam

A mining method and steep inclination technology are applied in the field of coordinated mining of deep cross-mining blocks with segmental inclination strips to achieve the effects of improving the recovery rate and production efficiency, reducing the uneven settlement and deformation of the surface, and slowing the surface deformation.

Inactive Publication Date: 2014-03-12
CHINA UNIV OF MINING & TECH (BEIJING) +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a rock layer movement control that can effectively control the movement and deformation of the rock layer and the ground surface, reduce mining damage, and improve the coal recovery rate for steeply inclined coal seams with a coal seam dip angle greater than 45° Coordinated mining method of segmental inclined strips in the deep part of the steeply inclined coal seam

Method used

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  • Harmonious mining method for block-type dip stripes in deep spanned mining areas of steep inclined seam
  • Harmonious mining method for block-type dip stripes in deep spanned mining areas of steep inclined seam
  • Harmonious mining method for block-type dip stripes in deep spanned mining areas of steep inclined seam

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Effect test

Embodiment 1

[0052] The mining sequence of coal seam groups is as follows: figure 1 As shown, the steeply inclined coal seam group contains 6 recoverable coal seams, which are 3#, 5#, 6#, 8#, 10# and 12# coal from bottom to top; mining area, the dip section is divided into two mining levels, which are -110m level and -210m level from top to bottom, and the vertical height of each stage is 100m; a total of 12 blocks are mined, from left to right and from top to bottom respectively. These are block 1, block 2, ..., block 12. The mining sequence of the coal seam group is mining the upper level first, and then mining the lower level. The mining sequence of the same mining level is block 1, block 3, block 2, block 4, block 5 and block 6.

[0053] The mining sequence across mining blocks is as follows: figure 2 As shown, the West 8th to West 11th mining areas of Datai Well are divided into 2 mining levels, which are -110m level and -210m level from top to bottom, and the stage vertical height...

Embodiment 2

[0057] Such as Figures 4a-4g , Figure 5 and Figures 6a-6c As shown, the West 8th to West 11th mining areas at the -210m level of Datai Well are steeply inclined coal seam groups, and there are 7 mineable coal seams, which are slot 11, slot 10, slot N8, slot 6, and slot 5 from top to bottom. Slot, 4 slot, 3 slot. The coal seam strikes NE45°~NE54°, inclines to the northwest, the coal seam inclination angle is 60°~70°, the average is 65°, the average strike length is about 1200m, the mining elevation is -210m~-110m, the mining vertical height is 100m, the mining depth is 460m~560m, the coal seam cumulative The thickness is 10.78m. The mining sequence of the coal seam is multi-coal seam joint mining, that is, the mining of slot 4, N8, and slot 11 in the first stage; the mining of slot 3 and 6 in the second stage; and the mining of slot 5 and 10 in the third stage. There are many faults in the Xishi mining area, and it is impossible to arrange the working face. Here, the pro...

Embodiment 3

[0061] A mine is a group of steeply inclined coal seams, the mining depth of the lower boundary is 600m, the coal seam dip angle is 70°, the mining thickness is 3m, the stage vertical height is 100m, the working face is 250m long, and the coal pillar width is 80m. The overlying rock is medium hard rock. By using the "steeply inclined coal seam mining subsidence prediction analysis system (this prediction analysis is the prior art)" developed by the inventor to simulate calculation. Distribution of surface movement and deformation after mining with coordinated mining method in deep cross-mining area with steeply inclined multi-coal seams. Depend on Figure 7a with 8aIt can be seen that after the mining of mining area 1, mining area 3 and mining area 5, the strip coal pillars in mining area 2, mining area 4 and the mining interval play a good role in blocking the expansion of the goaf and the continuous distribution of stress on both sides, so that The ground surface is in a s...

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Abstract

Aiming at the problems that a lower steep inclined deep part of a building (structure) is large in coal briquetting range and a traditional dip stripe method is low in recovery ratio and production efficiency, the invention discloses a harmonious mining method for block-type dip stripes in deep spanned mining areas of a steep inclined seam. By centering on a protective coal pillar of a building (structure) group, the steep inclined seam with a dip angle of over 45 degrees is divided into multiple block-type mining areas according to the mining level along the trending direction of the seam, and mining blocks and stripe coal pillars are arranged. According to an insufficient mining subsidence principle and the stability requirements of the coal pillar, the width of the block-type mining areas and the width of the dip stripe coal pillars are determined, and multiple bow pseudo-inclined working faces are arranged in the mining areas. The top-to-bottom jointed mining of multiple working faces with aligned cut holes is performed in each mining area, and skip-mining-area intermittent layout and cross-mining-area coordinated mining are adopted between the mining areas. According to the invention, the subsidence influence of each stage of coal pillar mining can be balanced, and the deformation of surface movement can be controlled, so that the recovery rate of the protective coal pillar is improved, and the production efficiency is improved, therefore, the method has good adaptation for the dip angle of the seam.

Description

technical field [0001] The invention relates to a coal seam mining method, in particular to a deep cross-mining block section-type inclination strip coordinated mining method controlled by movement of a steeply inclined coal seam. Background technique [0002] With the deepening of mining of steeply inclined coal seams, the problem of three-down coal pressing in steeply inclined mines in my country has become increasingly serious. For example, in Datai Well of Muchengjian Coal Mine in Beijing, the inclination angle of the Jurassic coal seam is 45-88°, and the mining depth is greater than 500m. There are 8 mineable coal seams, involving many types of ground protection objects and large differences in structure. The compressed coal in villages, railways, shafts and industrial squares has reached 11 million tons, accounting for one-third of the total reserves of the mine. [0003] In order to ensure the safety of protected objects up and down the well, Dataijing requires that ...

Claims

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Application Information

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IPC IPC(8): E21C41/16
Inventor 戴华阳马植胜王明立王忠武阎跃观胡炳南田秀国李培现郭俊廷廖孟光
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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