Method for controlling rib spalling in double hard high-mining-height fully-mechanized mining face coal wall

Abstract

The invention discloses a method for controlling rib spalling in a double hard high-mining-height fully-mechanized mining face coal wall rib. The method is sequentially performed according to the following operation steps of: a, at a distance of 100-150 m ahead a fully-mechanized mining face, constructing a drill site at a position corresponding to a transportation roadway and a return roadway at an interval of 100-150 m; b, arranging a drill in the drill site, adjusting height of the drill, and punching radial drill holes in a coal bed towards the direction of the fully-mechanized mining face; c, injecting chemical slurry into the drill holes after drilling construction is finished, thereby solidifying the chemical slurry to form a super-long chemical slurry anchor rod; and d, operating a coal mining machine on the fully-mechanized mining face to start to work to mine coal, thereby reinforcing the coal wall which produces a large number of secondary interstices under the action of bearing pressure. The method has an obvious rib spalling prevention effect, situation of shut-down mistiming during rib spalling treatment in the mining face is avoided, and the yield of the fully-mechanized mining face can be favorably improved.

Description

Technical field: [0001] The invention belongs to the technical field of prevention and control of coal wall spalling in fully mechanized mining working faces of coal mines. Background technique: [0002] Large mining height fully mechanized mining technology has become an important way for safe and efficient mining of thick coal seams. However, with the increase of the thickness of the primary back mining coal seam, the probability of coal wall spalling and roof leakage in the large mining height working face increases, which increases the difficulty of roof management and safe production of the working face. Due to the prominent problem of coal wall spalling in fully mechanized mining faces with large mining heights, special coal wall reinforcement measures have to be taken in some fully mechanized mining faces with large mining heights, which increases the auxiliary workload and increases the cost per ton of coal. When the geological conditions are complex, there may even...

AI Technical Summary

Problems solved by technology

In order to solve the problem of coal wall slabs in fully mechanized mining working faces with two hard and large mining heights, a lot of research has been carried out at home and abroad on stepped mining, increasing the working resistance of fully mechanized mining hydraulic supports, and bolting coal walls. To a certain extent, certain effects have been achieved, but there are still problems affecting production and coal quality, and cannot completely solve the problem of coal wall fragmentation in fully mechanized mining working faces with two hard and large mining heights.

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