嗣后充填法用于铁矿地下开采,使资源得到合理开发利用,同时保护了矿区地质环境。在对典型铁矿采空区充填、竖井封闭、斜坡道封堵等分析的基础上,估算了含水层结构破坏情况,其现状(影响半径0.154 km、面积1.097 km 2)和预测(影响半径0.36...嗣后充填法用于铁矿地下开采,使资源得到合理开发利用,同时保护了矿区地质环境。在对典型铁矿采空区充填、竖井封闭、斜坡道封堵等分析的基础上,估算了含水层结构破坏情况,其现状(影响半径0.154 km、面积1.097 km 2)和预测(影响半径0.362 km、面积2.923 km 2)均显示破坏严重,而现状和预测发生矿山地质灾害的可能性较小。从含水层和地质灾害的多方面提出了地质环境问题的防治措施。展开更多
To improve mining production capacity, a stage subsequent filling mining(SSFM) method is employed for Sijiaying iron mine. The height of the stage stope is approximately 100 m. As there are farmlands and villages on t...To improve mining production capacity, a stage subsequent filling mining(SSFM) method is employed for Sijiaying iron mine. The height of the stage stope is approximately 100 m. As there are farmlands and villages on the surface of the mine, the surface deformation should be controlled when the ore is mined out for the purpose of stope stability and minimizing surface subsidence. In this paper, according to the site-specificgeological conditions, the self-stability of the stagefi lling body was analyzed, and the failure mechanism of back filling body was defined. Thus the relationship between the exposed height of filling body and the required strength was obtained. Next, the stability of back filling body and the characteristics of surface subsidence due to mining of 450 m level were analyzed using physical modeling.Finally, a three-dimensional numerical model was established using FLAC3 D, with which the surface subsidence and the stability of stope were achieved. The results show that the stope basically remains stable during the two-step recovery process. The maximum magnitude of the incline is 10.99 mm/m, a little larger than the permissible value of 10 mm/m, and the horizontal deformation is 5.9 mm/m,approaching the critical value of 6.0 mm/m, suggesting that the mine design is feasible for safety mining.展开更多
文摘嗣后充填法用于铁矿地下开采,使资源得到合理开发利用,同时保护了矿区地质环境。在对典型铁矿采空区充填、竖井封闭、斜坡道封堵等分析的基础上,估算了含水层结构破坏情况,其现状(影响半径0.154 km、面积1.097 km 2)和预测(影响半径0.362 km、面积2.923 km 2)均显示破坏严重,而现状和预测发生矿山地质灾害的可能性较小。从含水层和地质灾害的多方面提出了地质环境问题的防治措施。
基金support by the National Basic Research Program of China (973 Program) (Grant No.2010CB731500)
文摘To improve mining production capacity, a stage subsequent filling mining(SSFM) method is employed for Sijiaying iron mine. The height of the stage stope is approximately 100 m. As there are farmlands and villages on the surface of the mine, the surface deformation should be controlled when the ore is mined out for the purpose of stope stability and minimizing surface subsidence. In this paper, according to the site-specificgeological conditions, the self-stability of the stagefi lling body was analyzed, and the failure mechanism of back filling body was defined. Thus the relationship between the exposed height of filling body and the required strength was obtained. Next, the stability of back filling body and the characteristics of surface subsidence due to mining of 450 m level were analyzed using physical modeling.Finally, a three-dimensional numerical model was established using FLAC3 D, with which the surface subsidence and the stability of stope were achieved. The results show that the stope basically remains stable during the two-step recovery process. The maximum magnitude of the incline is 10.99 mm/m, a little larger than the permissible value of 10 mm/m, and the horizontal deformation is 5.9 mm/m,approaching the critical value of 6.0 mm/m, suggesting that the mine design is feasible for safety mining.
