Research on the key technology of controlling the bottom drum of weakly cemented soft rock roadway
Based on the problem of the bottom drum of the roadway in the west wing of the transportation concentration of the No.6 coal seam of the old camp coal mine,which affected the underground transportation and safe production of the coal mine.Firstly,the lithology and structure of the roadway bottom slab were sampled and tested,which were found to contain clay minerals with high hydrophilicity.Secondly,the mechanical model of the roadway bottom slab was established from the mechanical mechanism of the roadway bottom slab.By increasing the thickness of the anchor layer,the deformation of the bottom slab could be effectively controlled to ensure the stability of the roadway surrounding rock.The deformation of the roadway under the existing roadway support scheme was analyzed by FLAC3D numerical simulation,which matched with the measured deformation results in the field,indicating that the existing support scheme and parameters were extremely unreasonable.Based on the reasonable optimization of the roadway support scheme,the optimized anti-bottom arch structural support scheme of"quicklime underlayment+prestressed anchor cable+concrete curved beam+metal mesh+C20 high-strength concrete filling"was proposed for industrial verification in the underground test section.The results showed that the optimized roadway support scheme was effective in controlling the deformation of the top and bottom plates and the two helpers,thus effectively ensuring the safe and efficient production of the mine.
large sectionsoft rock roadwaynumerical simulationcontrol of bottom drum
国家科技期刊平台
NSTL
万方数据
维普
