Industrial Testing of Roadway Excavation Along Goaf Rapid Excavation Technology for Thick Coal Seams in Huangtupo Coal Industry

In view of the problems of surrounding rock instability, strong dynamic pressure impact, low excavation efficiency and others in the 9103 track roadway under the condition of close distance dynamic pressure thick coal seams in Huangtupo Coal Industry, FLAC^3D numerical simulation and on-site monitoring are adopted to optimize the high-strength and low-density support parameters of coal pillar width of 4.5 m, anchor cable pretension of 230 kN, row spacing of 1300 mm×2000 mm, and length of 5300 mm. Combined with the complete set of mechanized operation line of "MB670-1 roadheader+PZL1500/300 type transfer crusher+DZQ100/100/40 belt transfer machine+DSJ-100/80/2×132 belt conveyor", the excavation efficiency is improved, achieving a maximum daily footage of 20 m and an average monthly footage of 250 m, shortening the construction period by 2.5 months. The mine pressure monitoring shows that the loose circle of the surrounding rock is contracted by 50%, the layer separation amount of the roof is reduced by 41.7%, the roof subsidence is≤9 mm, the maximum relative displacement amount between the two sides is 33 mm, the deformation rate remains stable at 0-3 mm/d, and the roadway stability is significantly improved. The rapid excavation operation reduces the manual participation rate to 35%, decreases the incidence rate of safety accidents by 50%, and increases the benefit of the advanced stoping by 33.565 6 million yuan. The research provides effective solutions for efficient, safe, and economical rapid excavation.