Device and method for preventing rock burst of coal mining working face

Abstract

The invention discloses a device and a method for preventing rock burst of a coal mining working face. The device comprises metal tubes, tungsten electrode bars, vibration output pressure plates, ceramic insulation bushings and locking nuts, wherein outer threads are arranged on the outer surfaces of the metal tubes. The method comprises the following steps: drilling two rows of drilling holes on rock wall, and screwing the metal tubes into the bottom parts of the drilling holes; fixedly connecting the tungsten electrode bars with the metal tubes; connecting a row of tungsten electrode bars with an anode of an external power supply, and connecting the other row of tungsten electrode bars with a cathode of the external power supply; outputting vibration through the vibration output pressure plates; transmitting the vibration to the metal tubes for amplifying through the tungsten electrode bars; spreading the amplified vibration to a rock body; peeling a loosened coal rock body in advance; forming an annular vibration zone on the mining working face; intercepting and weakening extraction impact vibration when transmitting the extraction impact vibration to the metal tubes; starting the external power supply while outputting the vibration, generating an electric field between the two rows of tungsten electrode bars, forming an annular electric field at the outer circle of the mining working face, carrying out assisted weakening on the strength of the extraction impact vibration, and realizing prevention of the rock burst in a fault fracture zone.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and in particular relates to a device and a method for preventing rock burst in a coal mining working face. Background technique [0002] At present, my country's coal mine rock burst is closely related to geological conditions, and the rock burst in the geological structure area has accounted for more than 60% of the total. With the continuous increase of coal mining depth, the frequency and intensity of rock bursts in geological structure areas are also increasing. Affected by the fragmentation and unobservability of coal and rock mass, rock bursts in fault areas have also increased in recent years. This kind of fracture zone rock burst disaster should seriously restrict the production safety of my country's coal mines. [0003] Practice has proved that when the roadway is excavated into the fault zone and the mining face advances to the fault zone, the rock stratum broken by the fault...

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Problems solved by technology

[0003] Practice has proved that when the roadway is excavated into the fault zone and the mining face advances to the fault zone, the rock stratum broken by the fault is relatively soft, the fracture range is large, and the impact risk of the coal seam is stronger, and it is very easy to Rockburst occurs, which in turn causes the coal and rock mass to collapse suddenly. Due to the strong concealment, it is extremely difficult to prevent

[0004] For this kind of rockburst in the fractured zone of the fault, because the coal seams at the two sides of the roadway are in a broken state, it is difficult to quantitatively determine the stress state of the coal body by conventional monitoring methods. Some preventive measures are mostly considered in terms of support, but in the face of more serious rock burst, the strength of the support is difficult to predict, and there are still potential safety hazards in the mining face, so it is necessary to comprehensively consider the characteristics of the medium to prevent rock burst

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