Surface Movement Law for Multi-Mining Areas Joint Mining of"Open-Caving-Filling"in Metal Mine
The surface movement and deformation caused by multi-mining areas and multi-method joint mining in metal mines are complex.In order to reveal the law of rock mass movement and deformation during joint mining,a three-dimensional finite element fully elastic numerical simulation was carried out using the joint mining of"open-caving-filling"in Dahongshan Iron Mine as an example.The displacement monitoring data of the surface automatic total station instrument were analyzed.The research results show that compared to the filling method mining of No.I copper mine,the main ore body caving method has the greatest impact on surface movement and the stability of open-pit slope,with the movement range crossing the F2 fault and affecting the open-pit top boundary.The horizontal displacement of the open-pit top boundary during underground filling and caving mining is reversed,and the slope is prone to tension and cracking.The northern part of the underground main mining area is prone to cracking along the vein under the superimposed mining stress.The monitoring data shows that although the settlement displacement caused by underground caving mining has not affected the open-pit slope,the slope has good stability characteristics,and the surface cracking range has not significantly expanded,but the moving range has a tendency to further expand.Based on the results of numerical calculation and monitoring data,safety protection measures for joint mining have been proposed,including slope protection,design optimization,monitoring system upgrade,and backfilling treatment of collapsed pits and waste rocks.This is beneficial for the safe and stable transition of multi-mining areas and multi-method joint mining in Dahongshan Iron Mine.
Open-pit miningCaving methodFilling methodJoint miningSurface movement
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