Method for preventing rock burst through secondary pressure relief

A technology of rockburst and geological conditions, which is applied in surface mining, earthwork drilling, underground mining, etc., can solve the problems of high cost of large drilling, rockburst, and inability to construct, achieve low cost, prevent rockburst Increased, less risky effects

Active Publication Date: 2014-05-28
PINGDINGSHAN TIANAN COAL MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the methods of controlling rock burst mainly include mining of liberated layers, rational layout of mining areas, water injection into coal seams, pressure relief blasting, large drilling, roof fracture blasting, etc. Among them, the mining of liberated layers and reasonable layout of mining areas are not easy to change once construction is carried out. The cost of drilling is high a

Method used

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  • Method for preventing rock burst through secondary pressure relief
  • Method for preventing rock burst through secondary pressure relief
  • Method for preventing rock burst through secondary pressure relief

Examples

Experimental program
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Effect test

Embodiment 1

[0044] In a certain mine, the rock solidity factor is f=3, and the coal firmness factor is f=1. At the selected position, a drilling rig is used to drill holes into the coal and rock mass, such as figure 1 As shown, the thickness of rock mass 1 is 32m, the thickness of coal mass 2 is 3m, the hole depth is 36m, and the hole diameter is 113mm; then through the hole, clean up the rock powder and cinder in the drill hole, and carry out radial hydraulic cutting, as shown image 3 As shown, the (b) figure on the right is the schematic diagram of the A-A cross-section in the (a) figure on the left, in which 3 is the blast hole and 6 is the slot; then put the explosive 5 with the detonator into the PVC pipe 4, and One section of pipe is 2m long, and it is sent into 11 sections of PVC pipe; then the same length (also 2m) of PVC pipe filled with yellow sand 8 is sent into the blast hole, and 0.5m of polyurethane 7 is bound in the middle of each section to ensure that the PVC pipe In the...

Embodiment 2

[0046] In a certain mine, the solidity coefficient of rock is f=5, and the solidity coefficient of coal is f=2. At the selected position, a drilling rig is used to drill holes into the coal and rock mass. The thickness of rock mass 1 is 37m, and the thickness of coal mass 2 is 4m. The depth is 42mm, and the hole diameter is 94mm; then through the hole, clean up the rock powder and coal slag in the drill hole, and make axial slits, as shown Figure 4 The figure (b) on the right is a schematic diagram of the B-B section in the figure (a) on the left, in which 3 is the blast hole and 6 is the slot; then put the explosive 5 with the detonator into the PVC pipe 4, and the length of the pipe is 2m, into 15 sections of PVC pipe; then the same length (also 2m) of PVC pipe filled with yellow sand 8 is sent into the blast hole, and 0.5m of polyurethane 7 is bound in the middle of each section to ensure that the PVC pipe is in the blast hole In the center, send a total of 5 sections; the...

Embodiment 3

[0048]In a certain mine, the firmness factor of the rock is f=4, and the firmness factor of the coal is f=3. At the selected position, a drilling rig is used to drill holes into the coal and rock mass. The thickness of the rock mass 1 is 50m, and the thickness of the coal mass 2 is 5m. The depth is 56mm, and the hole diameter is 94mm; then through the hole, the rock powder and coal slag in the drilled hole are cleaned up, and the combination of radial slotting and axial slotting is used to prevent rockburst, as shown Figure 5 As shown, the figure (b) on the right is a schematic diagram of the C-C section in the figure (a) on the left, in which 3 is the blast hole and 6 is the slot; then put the explosive 5 with the detonator into the PVC pipe 4, and the The length is 2m, and it is sent into 25 sections of PVC pipe; then the PVC pipe filled with yellow sand 8 of the same length (also 2m) is sent into the blasthole, and 0.5m of polyurethane 7 is bound in the middle of each secti...

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Abstract

The invention relates to a method for preventing rock burst through secondary pressure relief. In combination of coal-rock mass geological occurrence conditions and ground stress distribution characteristics, different water jet slotting manners are adopted for slotting coal-rock mass according to different rock burst types, and then powder charge bursting is performed. The method has the advantages as follows: after high-pressure water jet is adopted for axially grooving and radially slotting the coal-rock mass with burst hazard along a drill hole, stress of surrounding rock is redistributed, a concentrated stress zone is transferred to the deep part, and at the same time, a slot group (weak plane) formed by high-pressure water jet slots has a pressure relief function; and then, loosening blasting is performed, so that a fracture is further expanded, deformation energy of the coal-rock mass is released again, secondary pressure relief is realized, and rock burst is effectively prevented. Compared with the most common coal seam water injection and pressure relief bursting, the method has the advantages of short consumed time, good effect, wide pressure relief range and low risk.

Description

technical field [0001] The invention relates to a method for preventing and controlling rock burst, in particular to a method suitable for secondary pressure relief of coal and rock mass to prevent and prevent rock burst, and belongs to the technical field of mine safety. Background technique [0002] In the process of mining, when the stress around the mining space or the roadway exceeds the bearing capacity of the coal and rock mass, there will be a sudden dynamic failure of the coal and rock mass, and a large amount of deformation or ejection will occur in the mining space or the roadway space instantly, and a large amount of energy will be released. Elastic energy, here it is rock burst (metal mine or tunnel claims rockburst). Rock burst is one of the most serious disasters in mines, threatening human life and affecting the normal operation of mining work. [0003] At present, the methods of controlling rock burst mainly include mining of liberated layers, rational layo...

Claims

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Application Information

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IPC IPC(8): E21C41/18
Inventor 吕有厂代志旭康勇王晓川陈建忠王峰高建成仝艳军
Owner PINGDINGSHAN TIANAN COAL MINING
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