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A method for preventing rock burst of strong and weak roof in underground coal mine

A preventive method and technology of rock burst, which is applied in mining equipment, earthwork drilling, mining equipment, etc., can solve the problems of limited single-hole propping radius, insignificant roof weakening effect, and ineffective rock burst strength and frequency. Control and other issues, to achieve a good impact mine pressure prevention effect, weakening effect and efficiency balance, and improve the effect of weakening efficiency

Active Publication Date: 2020-04-14
TIANDI SCI & TECH CO LTD
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Problems solved by technology

However, this type of method has a limited radius of single-hole propping cracks, and has no obvious effect on roof weakening, and the intensity and frequency of rock bursts have not been effectively controlled.
[0003] To sum up, there is currently no preventive method that can effectively reduce the intensity and frequency of rock bursts by weakening the roof

Method used

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  • A method for preventing rock burst of strong and weak roof in underground coal mine
  • A method for preventing rock burst of strong and weak roof in underground coal mine

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] figure 1 and 2 What is shown is a preferred embodiment of the method for preventing rock burst of a strong and weakened roof under a coal mine according to the present invention.

[0031] The method for preventing impact rock pressure on the strong and weakened roof under the coal mine comprises the following steps:

[0032] (a) In the excavation space 1, according to a certain elevation angle, drill holes to the basic roof 2, the diameter of the drill bit 3 is Φ65mm, the drill pipe 4 is hollow, and the outer diameter is Φ50mm, the overall pressure resistance of the drill bit 3 and the drill pipe 4 Greater than 60MPa, starting from the drill bit 3, an ejector 5 is installed every 1m along the drill pipe 4;

[0033] (b) When t...

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Abstract

A coal mine underground strengthening-weakening roof impact mine pressure prevention method includes: constructing in an excavating space to obtain a drilled hole, punching a depth notch out of the drilled hole, and isolating, closing and crackling the drilled hole. By the method, a basic roof in the excavating space can be strengthened and weakened, so that effective prevention of impact mine pressure is realized.

Description

technical field [0001] The invention relates to a method for preventing impact rock pressure of a strong and weakened roof under a coal mine. Background technique [0002] Rock burst is a serious threat to the safe production of coal mines in my country. The occurrence of many shallow rockbursts is directly related to the dynamic load caused by the fracture of the hard roof. In addition, the depth of coal mining in my country is gradually increasing, and the number of deep mines is increasing year by year. Usually, the dynamic load generated by the adjustment of the multi-layer structure of the deep overburden is more frequent and stronger than that of the shallow one, which is one of the reasons why deep mines are more prone to rock burst. It can be seen that whether it is shallow or deep, the hard roof is one of the important causes of rock burst, and its weakening has practical significance for the prevention and control of rock burst. At present, the method of weakeni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F17/00E21B43/26
CPCE21B43/26E21F17/00
Inventor 潘俊锋刘少虹王东攀王书文马文涛夏永学
Owner TIANDI SCI & TECH CO LTD
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