Method for reinforcing outburst-prone coal seam cross-cut coal uncovering

Abstract

The invention discloses a method for reinforcing cross-cut coal uncovering at an outburst-prone coal seam and is particularly suitable for cross-cut quick coal uncovering at a coal seam having outburst dangers and a horizontal thickness of less than 8 meters in a coal mine. The method comprises the following steps: firstly, drilling and pre-extracting gas in a coal seam in front of a cross cut to reduce the gas content and gas potential of the coal seam; manufacturing an reinfrocing ring having a thickness which is 0.4 to 1 time of that of the cross cut on the periphery of the cross cut and using an anchor cable for joint reinforcement to improve the reinforcing effect of the coal seam and realize safe coal uncovering; drilling discharge holes inside the reinforcing ring, controlling distances within 4 to 8 meters on the two sides of a laneway and connecting pipes to drain the gas, reduce gas pressure and the destructive effect of a high gas pressure on the coal seam; and after the drainage of gas, using related gas discharge holes as injection holes and injecting a reinforcing material around the cross cut to reinforce coal rocks, form a reinforcing structure with a framework and improve the reinforcing effect. The method can reduce outburst elimination work amount by 20 to 40 percent under a condition of ensuring safe coal uncovering, reduce gas drainage time construction period and improve safe coal uncovering speed by 25 to 50 percent.

Description

technical field [0001] The invention relates to a coal uncovering and reinforcing method for a stone door of an outburst dangerous coal seam, and is especially suitable for quickly uncovering coal at a stone door of a coal seam with outburst danger and a horizontal thickness within 8m in a coal mine. Background technique [0002] Outbursts of large scale and intensity are most likely to occur when coal is unearthed in Shimen in outburst dangerous mines, which seriously restricts the safe and rapid production of mines, causes mining imbalance, and casts a serious shadow on people's psychology. At present, when the Shimen unearthed coal with the risk of outburst is reinforced, it is mainly to inject reinforcement materials into the coal rock body through drilling holes, or use auxiliary measures of metal skeletons. Because the high ground stress or gas pressure inside the reinforced circle layer cannot be removed through reinforcement alone, and the strength of the formed simp...

AI Technical Summary

Problems solved by technology

Because the high ground stress or gas pressure inside the reinforced circle layer cannot be removed through reinforcement alone, and the strength of the formed simple reinforced body is increased, but once it is damaged, the bearing capacity of the reinforced body will be seriously reduced, thus weakening the effect of reinforcement , cannot effectively resist the impact of unraveling coal, which makes the work of unraveling coal more dangerous

However, at least one end of the metal skeleton is not fixed during use, and there is no bond between the metal skeleton and the coal and rock mass. When the coal and rock mass deforms, the metal skeleton mainly relies on its bending strength to resist the deformation of the coal and rock mass. , the resistance effect is poor; in addition, the metal skeleton cannot apply pre-tension force, so in the initial stage of coal-rock deformation, because the metal skeleton cannot effectively resist the deformation of the coal-rock mass, once the coal-rock mass deforms, its own bearing capacity will be seriously damaged reduce, forming a great safety hazard, and prone to prominent

In addition, when the coal seam is relatively soft and the drilling is difficult, the skeleton cannot be effectively sent to the pre-designed position, and the expected outburst prevention purpose cannot be achieved.

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