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Method for controlling collapse of roof of cantilever beam by liquid explosion

A cantilever beam and liquid explosion technology, which is applied in the field of mine pressure and rock formation control in mining engineering, can solve problems such as cantilever rock mass beams that are difficult to collapse, and achieve the effects of wide application range, high safety, and strong reliability

Active Publication Date: 2021-07-16
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the cantilever rock mass beam formed on the surrounding roof of the working face is difficult to collapse, and provides a method for controlling the collapse of the cantilever beam roof by using liquid explosion

Method used

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  • Method for controlling collapse of roof of cantilever beam by liquid explosion
  • Method for controlling collapse of roof of cantilever beam by liquid explosion
  • Method for controlling collapse of roof of cantilever beam by liquid explosion

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Embodiment Construction

[0048] The present invention will be further described with reference to the accompanying drawings.

[0049] The method of controlling the cantilever beam top plate is used, including borehole, hydraulic tube, liquid-explosive hydraulic tube, sealing tube, sealing nip tube, emulsion pump and other means.

[0050] The drilling angle is 60 °, the pores and drilling diameters determines according to the one-shaft compressive strength of the top plate rock body, the plum size is less than 70 MPa, and the pore distance is 6m when the rock mass is less than 70 MPa; the aperture resistance intensity is greater than 70MPa but less than 120MPa, the aperture is φ60mm, the hole distance is 5m; the aperture compressive strength is greater than 120 MPa, the aperture is φ80mm, the hole distance is 4m;

[0051] The hydraulic tube is a rubber material resistant to acid and anti-corrosion, and the expansion ratio of the rubber tube should not be less than 12%, which is not broken when it is greate...

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Abstract

The invention discloses a method for controlling collapse of a roof of a cantilever beam by liquid explosion, and belongs to the technical field of mine pressure and rock formation control in mining engineering. The method can solve the problem that a cantilever rock mass beam formed along the roof on the periphery of a stope is difficult to collapse after an underground long-wall stope face of a coal mine is stoped. According to the method, drill holes are formed in a roof cantilever rock mass beam according to a pre-designed fracture line, liquid explosion pipes (tubular rubber bags) are arranged in the drill holes to inject high-pressure emulsified liquid to expand and do work, the circulating pulsating pressure of the high-pressure emulsified liquid forms pulsating 'hammering force ', the roof rock mass forms fracture cracks according to the designed roof fracture line, the method belongs to the drawing action principle, therefore, the roof rock mass is fractured, unstable and collapsed along the fracture, and the purpose of forcibly cutting off the conduction stress of the cantilever beam is achieved. The device is simple in structure, convenient to install, safe, reliable and capable of being widely popularized.

Description

Technical field [0001] The present invention belongs to the mining engineering mine pressure and rock formation control technology, and in particular, the present invention relates to a method of using liquid-explosive control cantilever beam top panels. Background technique [0002] After returning the surface of the coal mine, after returning the work surface, the roof belt (layers) formed along the top of the pavilion forms a cantilever rock body beam, and its gravity and upper rock formation stress are formed by cantilever beam conduction to form a stress concentration around the field. The mining activities around the field have great harm. The method of increasing the coal columns is usually used to solve but can cause resource loss. Currently, the method of cutting the cutting pressure is cut off, and the stress conduction is blocked. The collapse of the collections of the collections, if the hard roof rock formation is very easy to form, the large area is suspended, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18E21C37/12
CPCE21C41/18E21C37/12
Inventor 刘喆郝兵元刘毅勇王东亮任兴云梁晓敏
Owner TAIYUAN UNIV OF TECH
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