Method for realizing fast coal exposing of coal seam rock cross with outburst danger

Abstract

The invention relates to a method for realizing fast coal exposing of coal seam rock cross with outburst danger and is particularly applied to the fast exposing of the coal seam rock cross with extreme outburst danger in a coal mine. According to the method, a strong-weak-strong protective structure is formed by making a reinforcing ring of certain thickness and a weak ring with the thickness equal to or twice that of the reinforcing ring around rock cross, wherein the weak ring can effectively absorb the energy generated due to the release of deep crustal stress during coal exposing and the energy absorption rate can reach 50 to 90 percent, thereby effectively cushioning the impact on the periphery of a laneway and reducing the original crustal stress around the laneway by 40 to 90 percent, while the reinforcing ring just resists the extrusion and impact on the laneway caused by residual stress during coal exposing to ensure safety. The method can reduce extrusion-eliminating quantities by 20 to 30 percent on the premise of ensuring safety; moreover, the method reduces gas pumping time, shortens construction period and increases the speed of the safe coal exposing by 20 to 50 percent.

Description

technical field [0001] The invention relates to a method for quickly uncovering coal from a stone door in an outburst dangerous coal seam, and is especially suitable for quickly uncovering coal in a coal mine with a strong outburst dangerous stone door. Background technique [0002] Outbursts are most likely to occur when coal is uncovered in Shimen mines, and large-scale outbursts in all mining areas basically occur at this time, which seriously restricts the safe and rapid production of mines. At present, the coal-excavation methods in Shimen with outstanding risks mainly include hydraulic punching, hydraulic cutting, metal skeleton, etc., but these measures only play a role in weakening or strengthening the coal-rock mass at the coal-excavation point, forming a single protective structure , and did not release the deep ground stress, nor can it block or buffer the impact energy generated by the release process on the roadway and the impact. At the moment of uncovering th...

AI Technical Summary

Problems solved by technology

However, engineering practice shows that under the protection of these methods, the speed of unearthing coal in Shimen is still very slow, which is one of the most dangerous operating processes, which wastes a lot of manpower and material resources, affects the progress of the project, and causes mining imbalance.

Especially for new mines, due to the large investment in the early stage, there has been no production, and it is absolutely not allowed to waste a lot of time

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