Combined rock cross-cut coal uncovering method

It is a combination technology for uncovering coal at Shimen, which is applied in earthwork drilling, surface mining, underground mining, etc. It can solve problems such as increasing the difficulty of sealing holes and operating risks, reducing the overall strength of coal and rock, and destroying the integrity of coal bodies. Achieve the effects of shortening the gas pre-pumping time, increasing the effective range of influence, and reducing the amount of outburst elimination works

Active Publication Date: 2014-01-15
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Measures such as hydraulic slotting can effectively relieve the ground stress and gas pressure, but at the same time destroy the integrity of the coal body and reduce the overall strength of the coal body; grouting reinforcement can effectively improve the strength of the coal

Method used

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  • Combined rock cross-cut coal uncovering method
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  • Combined rock cross-cut coal uncovering method

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the embodiment in the accompanying drawings:

[0017] Such as figure 1 , figure 2 and image 3 As shown, a combined method for uncovering coal at Shimen of the present invention includes the following steps: Shimen 5 implements exploration and excavation while digging according to conventional methods, and explores parameters such as the azimuth, inclination and thickness of the coal seam according to the geological hole data of construction, and uncovers the coal for Shimen. Lay the foundation for coal work; when the vertical distance between Shimen 5 head-on and coal seam 1 is 10m, stop the excavation, and construct drilling site 4 head-on at Shimen 5. The size of drilling site 4 depends on the type of drilling rig. Transfer to drilling site 4, according to image 3 As shown, a plurality of drill holes forming a network are constructed alternately from the drill field 4 to the coal seam 1 . ...

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Abstract

The invention discloses a combined rock cross-cut coal uncovering method which is particularly suitable for quick rock cross-cut coal uncovering of outburst dangerous coal seams in underground coal mines. When a cross cut is tunneled to be at a vertical distance of 10 m from coal seams, a drill site is directly constructed in the cross cut; the coal seams are constructed and holes are drilled in the drill site; the drill holes are arranged at intervals by slotting drill holes and general drill holes; the uniform pressure relief of coal bodies is realized through the combined arrangement of the slotting drill holes and the general drill holes. After the drilling operation is finished, pipes are connected for extraction and drainage to reduce the gas content and the gas potential in the coal seams. After the gas extraction is qualified, the slotting drill holes are used as slurry injecting drill holes to inject cement mortar in the coal bodies for strengthening the coal bodies, so that the combination of slotting pressure relief and reinforcement is realized. Under the condition of guaranteeing safe coal uncovering, through the adoption of the method, the outburst removing engineering amount can be reduced by 30-40%, the gas extraction time and the coal uncovering period can be shortened, and the safe coal uncovering speed is increased by 40-50%.

Description

technical field [0001] The invention relates to a combined stone gate coal uncovering method, in particular to a safe and quick coal uncovering method suitable for protruding dangerous coal seams underground in coal mines. Background technique [0002] Coal and gas outburst (hereinafter referred to as outburst) is a dynamic phenomenon in which the gas-containing coal body in a coal mine is suddenly thrown into the mining space in a very short period of time. It is one of the most serious disasters in coal mine production. Outburst often occurs in the process of uncovering coal in Shimen. At present, it is generally believed that the outburst is the result of the comprehensive effect of in-situ stress, gas pressure and coal-rock strength. Scholars at home and abroad have proposed many outburst-preventing methods for uncovering coal in Shimen based on the outburst mechanism. Measures such as blasting and hydraulic slotting mainly include measures such as metal skeleton and gr...

Claims

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Application Information

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IPC IPC(8): E21C41/16
Inventor 林柏泉李贺杨威高亚斌王迪
Owner CHINA UNIV OF MINING & TECH
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