特厚煤层综放开采时巷道更容易变形,对支护方案提出了更高的要求.在对某特厚煤层进行概述的基础上,结合煤层实际情况设计了小煤柱巷道支护的技术方案.方案主要是使用锚杆、锚索、W型钢带、钢筋网、金属网等进行联合支护,锚杆和锚索的规格型号分别为Φ22 mm × 2 400 mm 和 Φ21.8-1 × 19-6300(或 4 300)mm.巷道破碎区域可以使用W型短节钢带、矿用工字钢、高强度蝶形托盘等进行强化支护.通过实践观察,发现巷道围岩变形量在可以接受的范围内,锚杆和锚索的预紧力也在理想范围内.支护方案有效保障了小煤柱巷道的稳定性.
Research on the Support Technology of Small Pillar Roadway in Integrated Mining of Extra-Thick Coal Seam
The roadway is more prone to deformation in the integrated mining of extra-thick coal seams,which puts forward higher requirements for the support scheme.On the basis of an overview of a particularly thick coal seam,a technical scheme for small coal pillar roadway support is designed in combination with the actual situation of the coal seam.The programme mainly uses anchor rods,anchor cables,W-type steel belts,steel mesh,metal mesh,etc.for joint support,and the specification models of anchor rods and anchor cables are Φ22 mm × 2,400 mm and Φ21.8-1 × 19-6300(or 4,300)mm,respectively.The crushed area of the roadway can be reinforced with W-type short-section steel belts,mining I-beams,high-strength butterfly trays,etc.Through practical observation,it is found that the deformation of the roadway peripheral rock is within the acceptable range,and the pre-tensioning force of the anchor rods and anchor cables is also within the ideal range.The support programme effectively guarantees the stability of the small coal pillar roadway.
extra thick coal seamsmall coal pillarsupport technologyanchor rods and anchor ropessurrounding rock deformation
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