Research on Optimization of Roadway Support Parameters Based on EWM-MARCOS Comprehensive Evaluation Model
In order to cope with the severe challenges of frequent repair and high cost of roadway sup-port in an underground mine in Yunnan,combined with the existing support conditions of the mine,and comprehensively considering the factors of support safety,cost and efficiency,the parameters of bolt length,steel mesh degree and shotcrete thickness are optimized.Through the EWM-MARCOS comprehensive eval-uation model,the best support parameter scheme is optimized that:bolt length is 2.5 m,steel mesh is 150 mm×200 mm,shotcrete thickness is 200 mm.The field practice shows that the preferred support scheme is used to support the roadway,the roof subsidence of the roadway is reduced by 3.37 mm,and the conver-gence deformation of the two sides is reduced by 3.38 mm,which improves the stability of the surrounding rock to a certain extent.From an economic point of view,considering the frequency of support repair,the support cost is reduced by 85.10 yuan/m compared with the original scheme.Therefore,the EWM-MAR-COS comprehensive evaluation model is used to optimize the support scheme,which can optimize the prob-lem of high repair frequency and high support cost of roadway support in the mine to a certain extent.
optimization of support parametersMARCOS multi criteria decision-making methodEWM-MARCOS comprehensive evaluation model
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