Rock burst pressure relief and danger relief method

Abstract

The invention belongs to the technical field of coal mine underground roadway support, and particularly relates to a rock burst pressure relief and danger relief method. The method comprises a roadway bifurcation section, wherein an abdicating energy absorption support mechanism is arranged inside the roadway bifurcation section; a shallow surface surrounding rock anchor net support ring is built on the outer wall of the abdicating energy absorption support mechanism; the abdicating energy absorption support mechanism comprises an O-shaped steel shed frame, pressure decomposition pressure relief layers and pressure division toughness tubes; the pressure decomposition pressure relief layers and the pressure division toughness tubes are respectively provided with a plurality of layers and are distributed at intervals; the pressure decomposition pressure relief layer consists of a plurality of arc-shaped buffer pressure division steel plates in fish scale-shaped distribution; the impact energy abdicating absorption is realized through the arranged abdicating energy absorption support mechanism; the rock burst destructiveness is weakened; meanwhile, the arranged arc-shaped buffer pressure division steel plates are matched with the pressure division toughness tubes for dispersing the pressure to the whole O-shaped steel shed frame; the O-shaped steel shed frame is sufficiently utilized; and the whole support system collapse due to local instability of the support system is avoided.

Description

technical field [0001] The invention belongs to the technical field of underground roadway support in coal mines, and in particular relates to a pressure relief and danger relief method for rock burst. Background technique [0002] Rock burst is one of the most serious natural disasters in coal mines all over the world. It is due to the high concentration of stress in coal and rock mass due to mining and geological action, which accumulates a large amount of elastic deformation potential. When the stress exceeds the allowable limit state, the coal and rock mass The deformation energy is released suddenly, sharply, and violently, and the coal and rock mass is thrown out, causing damage to the support, roof caving, blockage of the roadway, and injury to personnel, especially in areas with high stress concentration such as roadway bifurcations. Rockburst accidents are prone to occur. For the suddenness and destructiveness of rockburst, the supporting brackets show local fragili...

AI Technical Summary

Problems solved by technology

[0002] Rock burst is one of the most serious natural disasters in coal mines all over the world. It is due to the high concentration of stress in coal and rock mass due to mining and geological action, which accumulates a large amount of elastic deformation potential. When the stress exceeds the allowable limit state, the coal and rock mass The deformation energy is released suddenly, sharply, and violently, and the coal and rock mass is thrown out, causing damage to the support, roof caving, blockage of the roadway, and injury to personnel, especially in areas with high stress concentration such as roadway bifurcations. Rockburst accidents are prone to occur. For the suddenness and destructiveness of rockburst, the supporting brackets show local fragility and even overall instability. If it is not bad, it will cause extremely serious damage As a result, the instability and damage of the support system is not mainly due to insufficient strength, but due to the poor impact resistance of the support bracket and the lack of a good function of buffering and pressure relief. At present, my country's coal mines have generally entered the deep mining stage. With strong mine pressure and increasingly complex geological conditions, higher requirements are put forward for support, so it is urgent to propose more reasonable support methods to ensure the personal safety of coal miners and the smooth progress of mining work

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