Support of The Return Airway In The Lower Slice of A Thick Coal Seam
DOI:
https://doi.org/10.63313/AJET.9055Keywords:
Ultra-Thick Coal Seam, Remnant Coal Body, Lower-Seam Gate Road Layout, Protodyakonov’s Pressure Arch, I-Beam SupportAbstract
To address the support challenges of lower-seam gate roads under conditions of thick coal seam slicing mining and village-subjacent coal extraction, this study investigates the 52204 tailgate at WulanSetai Coal Mine. The gate road is situated 6 m inward from the solid coal boundary of the upper-seam 52113 goaf. Based on Protodyakonov’s pressure arch theory, a mechanical source analysis model for the tailgate was established, and support effectiveness was evaluated using FLAC3D numerical simulation. Results indicate that due to the gate road’s position beneath the goaf, I-beam steel sets with a spacing of 450 mm are recommended. Additionally, to counteract the lateral load exerted by the boundary solid coal on the gate road ribs, supplementary rock bolts were installed on the pillar-side rib. These bolts are positioned at heights of 1.8 m, 2.7 m, and 3.3 m above the floor, thereby significantly enhancing the overall stability of the gate road.
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