Stopping Sequence Optimization Analysis of the Combination of Caving Method and Filling Method Based on the Stability of the Contact Zone

Non-pillar sublevel caving mining method is in advancing deep, shallow left lots of safety pillars. It needs to adopt the filling method to improve the recovery for reasonable use of these mineral resources. So, there are two methods of mining occurring together. To ensure the stability of the contact zone of non-pillar sublevel caving mining method and filling method, it is required to select the reasonable filling method to improve the recovery. At the same time, it is the combined mining of non-pillar sublevel caving mining method and filling method coordinately, and to optimize the stopping sequence of the two mining methods. For this reason, packing as energy storage and stress transfer effect, and simplifying the joint exploitation of contact zone to the mechanical model of beam and spring constraint for the calculation of shear stress and deflection, quantitative analysis of the contact zone of stress and strain. By using numerical simulation software, choose the typical profile of Chengchao Iron to simulate, set series monitoring in the contact zone, judge the stopping sequence through the principal strain values, upward horizontal slice stopping and backfilling method is suitable for the mining safety pillar. By means of further analyzing the impact of the combined mining of different stopping sequence on the contact zone, Optimize the stopping sequence in the case of joint exploration, to provide the reference for similar laboratory simulation test and field test, to provide guidance for mining field mining operations.