By deploying directional roof-cutting and the mining-induced pressure,self-caving of the roof above the goaf could form the roadway automatically,which is the so-called automatically roof-cut-ting formed roadway technology.To ensure the stability of the formed roadway,a supporting structure with high strength and high rigidity is necessary to control the roof deformation and resist the rock col-lapse from the goaf.Confined light concrete(CLC)structure is a composite structure manufactured by filling lightweight aggregate concrete into the confined material,which has characteristics such as high bearing capacity,high rigidity,and light self-weight.To understand the bearing behaviour of CLC sup-porting structure and to meet the controlling requirements of roof and rib support,this study carried out the lab and numerical tests on CLC supporting structure and normal structural steel support considering different section shapes and eccentricities.The deformation mode and bearing capacity of various speci-mens were analyzed,and the influence mechanism of cross-sectional parameters and eccentricities on the bearing capacity of supporting structures were also discussed.Based on the above testing results,CLC supporting columns were designed and applied in an extremely large coal mine:Ningtiaota Coal Mine,and favorable controlling effects of the automatically formed roadway were achieved.
关键词
切顶自成巷/支顶护帮/轻型约束混凝土/试验研究/现场应用
Key words
automatically formed roadway by roof cutting/roof and gangue rib support/confined light-weight concrete/experimental study/field application
维普
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