赵案庄铁矿尾砂充填技术及系统优化

Optimization of Tailings Filling System and Technique in Zhao'anzhuang Iron Mine

随着赵案庄铁矿采空区体积的增大和开采深度的加大,地压活动明显,导致矿房、巷道不同程度出现冒顶、片帮等现象,严重影响了井下安全生产。为确保采矿作业安全,防止采空区体积增大,减小地压活动的影响,根据采场每分层充填高度3 m左右的特点,将其下部1. 5 m采用微细粒尾砂胶结充填,上部1. 5 m采用粗粒尾砂胶结充填,并优化了充填工艺和操作步骤。微细粒和粗颗粒尾砂不同配比的充填体单轴抗压强度试验结果表明,微细粒尾砂胶结充填体强度满足生产安全要求。充填技术的应用能够有效减少采空区,减小地压活动影响,对于确保井下安全生产具有现实意义。

With the increasing of and goaf volume and mining depth of Zhao＇anzhuang Iron Mine, the ground pressure activity is obvious, it leads to the phenomena of roof caving and overburden at different levels in chambers and roadways, which seriously affects the underground safety production. In order to ensure underground operation safety, prevent the increasing of goaf volume and reduce the impact the ground pressure activity, according to the stope filling height （about 3 m） characteristics of each filling layers, the lower area with the height of 1.5 m are processed by cemented filling method by fine grained tailings, and the cemented filling method by coarse grained tailings is used for the upper area with the height of 1.5 m, besides that, the filling technique and operation steps are optimized. The uniaxial compressive strength test results of the filling body with the difference ratio of fine grained tailings and coarse grained tailings show that the safety production requirements can be met by adopting the filling method by fine grained tailings. The application of filling technique is help for reducing goaf and the impact of ground activity, it is great significance for ensuring the underground safety production.