Optimization of Stope Span for Sublevel Drilling Stage Open Stope with Subsequent Filling Mining Method
The stope span has a significant impact on the safety,economic benefits,and mining efficiency of underground production operations in mining enterprises.In order to select a reasonable stope span,taking a certain iron mine in Anhui as the engineering background,FLAC3D numerical analysis software and mathematical methods were used to study the two-step stope span in panel of the sublevel drilling stage open stope with subsequent filling mining method.Firstly,according to the calculation results of Mathews stability diagram method,six groups of two-step stope span schemes were designed in panel.Then,corresponding simulation models were constructed using MIDAS/GTS and FLAC3D for numerical calculations.Finally,based on the Critical weighting method,mining effect parameters and filling material costs were introduced as cost-based evaluation indicators,and panel production capacity was used as economic evaluation indicators.The safety and economic efficiency of the six groups of stope span schemes were comprehensively evaluated.The results indicate that scheme V(that the span of one-step stope is 15 m and the span of two-step stope is 17 m)has the highest score in the comprehensive evaluation,which belongs to the optimal two-step stope span scheme,and can better meet the safety,efficiency,and economic needs of mining production in on-site industrial test.
Sublevel drilling stage open stope with subsequent filling mining methodCritical weighting methodMathews stability diagram methodStope spanNumerical simulation
万方数据
维普
