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A Method of Controlled Caving for Hard Roof of Coal Seam

A technology of hard roof and roof, used in earth-moving drilling, surface mining, underground mining, etc., can solve problems such as poor controllability, pollution, and in-situ stress effects, and achieve the effect of easy operation and good controllability

Active Publication Date: 2016-03-30
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, provide a method for controlling the caving of the hard roof of the coal seam, and solve the problem that the existing method of controlling the caving of the hard roof is affected by ground stress, has poor controllability, is polluted, and is not applicable Technical Problems of High Gassy Coal Seam

Method used

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  • A Method of Controlled Caving for Hard Roof of Coal Seam
  • A Method of Controlled Caving for Hard Roof of Coal Seam
  • A Method of Controlled Caving for Hard Roof of Coal Seam

Examples

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Embodiment 1

[0031] Such as figure 1 , 2, 3, 4, and 5, a method for controlling the caving of a single hard rock roof in a coal seam, in a near-horizontal coal seam 8 (thickness 3m), direct roof 9 (mudstone with a thickness of 2m), old roof 10 (thickness 10m In the limestone), after the construction of the cut hole 5 and before the mining of the coal wall 1 of the working face, on the roof rock layer behind the hydraulic support 2, a row of inclined working face coal wall 1 is constructed along the direction perpendicular to the advancing direction of the working face. Drill hole 6. The distance between adjacent boreholes is 5m, the angle between the direction of the borehole axis and the vertical direction of the roof is 15°, and the depth of the borehole is 12.5m. interface (see figure 2 ); after the construction of all the boreholes 6 in the open cut hole 5 is completed, and before the mining of the working face, implement hydraulic cutting 13 to all the boreholes 6 (refer to imag...

Embodiment 2

[0035] Such as Figure 6 , 7 , 8, 9, and 10, a method for controlling the caving of the composite hard rock roof of the coal seam, in a near-horizontal coal seam 8 (thickness 3m), direct roof 9 (mudstone thickness 2m), old top fine sandstone 15 (thickness 4m), Laoding mudstone layer 16 (thickness 1m), and Laoding limestone layer 17 (thickness 5m), after the construction of cut hole 5 and before the coal wall 1 of the working face has been mined, the hydraulic support 2. On the roof rock layer at the rear, a row of boreholes 6 inclined to the coal wall 1 of the working face are constructed along the direction perpendicular to the advancing direction of the working face. The distance between adjacent drilling holes is 5m, the angle between the direction of the drilling axis and the vertical direction of the roof is 15°, and the drilling depth is 12.5m. Layer 16 and Laoding limestone layer 17 reach the interface between the overlying rock layer 11 and Laoding limestone layer 17...

Embodiment 3

[0039] Such as figure 1 , 2 , 3, 4, and 5, a method for controlling the caving of a single hard rock roof in a coal seam, in a near-horizontal coal seam 8 (thickness 3m), direct roof 9 (mudstone with a thickness of 2m), old roof 10 (thickness 5m In the limestone), the distance between adjacent boreholes is 20m, the angle between the direction of the borehole axis and the vertical direction of the roof is 45°, and the depth of the borehole is 10m.

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Abstract

The invention relates to a method for controlling roof caving under condition of hardroof in coal seam, which belongs to the technical field of coal mining and tunnel surrounding rocks controlling, and solves the problems of influence by crustal stress, poor controllability, pollution and inapplicability for high gas seam in the prior art. The method comprises the following steps: 1) constructing and boring rock stratum at the top of the coal seam along an open-off cut of a fully mechanized working face at the beginning of mining process and along one side of a return air laneway and a transporting mining roadway of the working face close to a coal column at a primarily mining phase and at a normal robbing phase; 2)implementing the operation of hydraulic slotting along a borehole, wherein the slotting direction is respectively consistent with the direction of the open-off cut, the return air laneway and the transporting mining roadway; and 3) sealing holes at two ends of the borehole, implementing hydraulic fracturing in the boring, and communicating the pressing cracks generated in the adjacent boreholes. The method for controlling roof caving under condition of hardroof in coal seam is used for controlling roof caving of high gas seam and hardroof, and has the advantages of good controllability, no influence by crustal stress, no pollution and easy operation.

Description

technical field [0001] The invention relates to a coal mine stope and roadway surrounding rock control technology, in particular to a method for controlling caving of a hard roof of a coal seam. Background technique [0002] When the roof of the mined coal seam is a hard rock layer, or there is a large thickness of complete hard rock layer within a certain height, or the top coal of the coal seam is thick and hard, during the initial mining of the working face and the normal mining of the working face, a hard roof above the coal seam will appear. The phenomenon that the roof hangs above the goaf does not rise, and the top coal is difficult to put. At this time, a large amount of elastic energy has accumulated in the coal body around the goaf, which not only affects the stability of the roadway in the coal body near the gob, but also once it falls, It is very easy to crush the bracket, cause the downhole air flow to be disordered, form a hurricane, and the ground suddenly col...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/16
Inventor 冯子军赵阳升刘正和吕兆兴徐素国康志勤段东
Owner TAIYUAN UNIV OF TECH
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