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Coal pillar type rock burst prevention and control method based on electric pulse

A technology of rock burst and electric pulse, which is applied in earthwork drilling, mining equipment, discharge machinery, etc., can solve the problems of insignificant pressure relief effect and heavy workload of drilling pressure relief, and achieve wide practical value and improve Single-hole gas drainage rate and the effect of reducing concentrated stress

Pending Publication Date: 2022-04-12
LIAONING TECHNICAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The workload of drilling pressure relief is heavy, the effect of pressure relief is not obvious, and multiple pressure reliefs are required

Method used

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  • Coal pillar type rock burst prevention and control method based on electric pulse
  • Coal pillar type rock burst prevention and control method based on electric pulse
  • Coal pillar type rock burst prevention and control method based on electric pulse

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Embodiment Construction

[0041] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0042] The present invention describes the implementation mode in detail by taking the prevention and control of rock burst of a coal pillar in a certain coal mine as an example. The buried depth of the 206 working face is 800m, the thickness of the coal seam is 12m, and there is no obvious structure inside the working face. There are 13m and 18m thick hard sandstone at the upper 8m and 30m of the coal seam. The inclined length of the working face is 200m, and the strike length is 1400m. The adjacent 205 working face has been mined. Due to the hard roof of the coal seam, the roof on one side of the goaf is not easy to collapse, and the overhanging roof caused serious def...

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Abstract

The invention provides a coal pillar type rock burst prevention and control method based on electric pulses, and relates to the technical field of mine safety production. According to the method, the stress concentration degree of the coal pillar is reduced from the goaf suspended roof fracturing and coal body weakening angles. A hydrofracture method is adopted to cut off a suspended and exposed top plate of the goaf, and the acting force of the suspended top of the goaf on the coal pillar is reduced. Meanwhile, an electric pulse presplitting method can be adopted for further presplitting and pressure relief of the concentrated stress area of the coal pillar, so that the concentrated stress is transferred to the deep area of the coal pillar, and the stress concentration degree of the surrounding rock of the roadway is reduced. The two methods act together to achieve the purpose of preventing and controlling the coal pillar type rock burst.

Description

technical field [0001] The invention relates to the technical field of mine safety production, in particular to a coal pillar type rock burst prevention method based on electric pulses. Background technique [0002] Coal mine rock burst refers to a severe dynamic disaster caused by the sudden destruction of coal and rock mass in underground roadways and working faces. According to statistics, as of June 2019, the number of rock burst mines in production in my country is 121, with a production capacity of about 400 million t / a, which plays an important role in ensuring coal supply. The occurrence of rock burst in my country is more common due to the influence of coal pillars. Coal pillar rock burst is due to the pressure in the coal body around the roadway (secondary stress caused by mining) increases from the metastable state to the limit value, and its accumulated energy suddenly increases. freed. Whether the coal and rock mass actually mined can occur dynamic disasters su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C37/12E21C37/18E21F17/18
Inventor 朱志洁贺爱萍付兴陈蓥韩军宋卫华霍丙杰
Owner LIAONING TECHNICAL UNIVERSITY
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