某铁矿全尾砂胶结充填体力学性能研究

Study on mechanical properties of cemented filling with full tailings in an iron mine

安徽某铁矿山针对西部矿区-370m以上的矿体,以及前期预留的矿柱拟采用分段空场嗣后充填采矿法进行回采。利用该矿选场产生的全尾砂作为井下充填骨料,不仅可以减少尾矿长期堆存而产生的各种问题,节约筑坝、防灾和防洪等工程建设费用,还能改善尾矿对环境造成的污染,为企业取得一定的社会、经济和环境效益。本文从该矿山全尾砂的物化性能入手,通过对全尾砂的物理性质测试和化学元素分析,充填体的单轴抗压强度测试、抗剪强度测试和承压变形试验,获得了不同充填料浆浓度和砂灰比与全尾砂胶结充填体力学性能的关系,为全尾砂作为矿山充填骨料提供了数据支持及理论依据。

An iron mine in Anhui province aims at the orebody above -370 m in the western mining area and the pre-reserved pillars.It is proposed to adopt sublevel open stope and subsequent filling mining method.Using the unclassified tailings produced by the ore dressing site as the filling aggregate in the underground can not only reduce the problems caused by the long-term stockpiling of tailings,save the construction cost of damming,disaster prevention and flood control,et al,but also can improve environmental pollution caused by tailings,certain social,economic and environmental benefits for enterprises can be obtained.The paper starts to study from the physical and chemical properties of the unclassified tailings,the relationship between different filling slurry concentration and mortar-cement ratio and mechanical properties of cemented unclassified tailings filling body is obtained through physical properties test and chemical element analysis of the unclassified tailings,uniaxial compressive strength test,shear strength test and compressive deformation test of the filling body.It provides data support and theoretical basis for the unclassified tailings as mine filling aggregate.