Design method of support parameters for short-distance coal roadway under goaf in coal mine

Abstract

The invention discloses a support structure and support parameter design method for a short-distance coal roadway under a goaf in a coal mine. Firstly, the damage depth and yield ratio of the bottom plate caused in the mining process of the upper coal seam are calculated; and then the top plate of the short-distance coal seam is classified; according to The support method is selected according to the classification of the roof; finally, the high-pretension high-strength anchor rod and the anchor cable steel beam structure are designed. The invention adopts high pre-tightening force and high-strength bolt support, which can effectively prevent the roof rock layer from loosening and caving, and can reduce the stress of the upper coal seam that has been affected by the mining of the upper coal seam and whose integrity has been damaged to a certain extent or the collapse of the coal seam after mining. The rock formation in the area is reinforced into a complete composite beam, and then through the suspension effect of the anchor cable channel steel beam, the roof structure changes less during the mining process of the lower coal seam, avoiding large mine pressure, and ensuring the integrity of the lower coal seam roadway.

Description

technical field [0001] The invention relates to the technical field of mining. Background technique [0002] Due to the difference in coal seam occurrence conditions, the number of recoverable coal seams in different coal fields can range from one layer to dozens of layers, and the distance between layers also varies greatly. Generally, those with a distance between layers less than 6 meters are regarded as short-distance coal seams. Depending on the interlayer spacing, the degree of mutual mining impact varies greatly. When the interlayer spacing of the coal seam is large, the mining of the upper coal seam has little impact on the mining of the lower coal seam, and the mining method and mine pressure appearance law of the lower coal seam are generally not affected by the mining of the upper coal seam. However, as the coal seam spacing decreases, the degree of mutual influence between upper and lower coal seam mining will gradually increase, especially when the coal seam sp...

AI Technical Summary

Problems solved by technology

The current support structure and support parameter design cannot meet the particularity of the coal roadway roof state in the process of extremely close coal seam mining, and it is difficult to ensure the integrity of the roadway, and most of them are damaged to varying degrees, affecting normal production

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