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Abstract:To solve the problem of channel destabilization in the deep recovery process of Jinfeng Gold Mine, the failure characteristics of the original channel support scheme were analyzed, and the mechanism of deformation and damage of the deep channel was analyzed, and three sets of support optimization schemes based on the principle of "controlling high stress + closing the rock surface to stop the deterioration of surrounding rock" were proposed. Both FLAC3D numerical simulation and field monitoring were used to compare and analyze the support effect of the original support scheme and the optimized scheme respectively. The research results have shown that the deformation damage mechanism has belonged to the stress expansion type and softening expansion type, which was jointly influenced and controlled by the characteristics of its own mineral components and high stress as the dominant force source, and its damage mechanism was mainly shear damage, with a small amount of tensile damage. In the control of the support effect, wet spray concrete, the thickness of the first and second support spray layers does not play a decisive role. However, the support effect of the joint support body formed by each anchor monomer in the secondary support was significantly improved with the optimization of the thickness of the secondary spraying layer; the field test results were consistent with the simulation results, and the joint support optimization scheme of "steel mesh + resin anchor + fiber concrete" was the optimal scheme, with significant support effect, and the cumulative displacement of the two sides and the top plate was reduced by 48.67% and 72.85% respectively compared with the original scheme.
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WANG Nengyue,WANG Kun,WANG Shibo.Analysis of destabilization mechanism and optimization of support for deep soft-break rock roadway[J].NONFERROUS METALS(Mining Section),2023,75(5):43-51.