Control method for large-dip-angle roof leakage-coal wall caving-support backward sliding

Abstract

The invention relates to a large-dip-angle mining supporting method, in particular to a control method for large-dip-angle roof leakage-coal wall caving-support backward sliding. The method is characterized by including the four steps of roof lapping, coal wall grouting, support tilting prevention and support anti-sliding, specifically, a rhombic 10# woven hole metal net with the specification of 5.0 m*1.0 m and the mesh size of 40 mm*40 mm is laid on a roof, a double-layer metal net is laid, and a first layer of metal net and a second layer of metal net are staggered and overlapped; grouting drill holes are constructed in areas with serious roof breakage and coal wall caving, grouting drill holes with the hole diameter of 43 mm are constructed every 3-5 m (every 3-5 supports), cable-stayed grouting anchor rods are constructed in roof drill holes along the junction of a coal wall and the roof at the elevation angle of 15-20 degrees, and horizontal grouting anchor rods are constructed in coal wall grouting drill holes at the distance of 0.5-1.5 m from the roof along a coal seam; every six supports serve as an anchoring point, and every two hydraulic supports are connected through two anti-falling jacks; and every ten supports are connected with a conveyor through anti-skid hinges.

Description

Technical field: [0001] The invention relates to a support method for mining with a large inclination angle, in particular to a control method for leaking leakage of a roof with a large inclination angle-coal wall side-support backsliding. Background technique: [0002] The high-dip coal seam refers to the coal seam with a buried dip angle of 35° to 55°. It is a difficult-to-mining coal seam recognized by the mining industry at home and abroad, accounting for about 20% of my country's proven coal reserves and 10% of production. Its safe and efficient mining is my country's Major engineering problems in resource development. In the longwall mining process of high-inclination coal seam, after the roof collapses, it slides down along the goaf, and along the inclined direction, a partitioned filling feature is formed in which the lower part is filled, the middle part is filled and the gap is large, and the upper part is filled and suspended. The deformation and failure character...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the phenomena of broken roof, unbalanced load on supports, slipping, falling, squeezing and biting between frames in the mining of existing large-inclination coal seams, optimizes the support method, and installs anti-slip and anti-falling devices to avoid secondary disasters in mining at large inclination angles. happened

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