煤矸石充填骨料替代品可行性研究

Feasibility research on substitution of gangue filling aggregate

为解决华泰矿业有限公司地下采空区危害及煤矸石骨料不足的问题，通过现场调研、室内试验、理论分析，对煤矸石充填骨料替代品砂岩、页岩、钢渣的物化性能及其充填配比实验和胶结机理进行深入研究。结果表明，钢渣是合适的替代骨料，其胶结体具有较高的抗压和抗拉强度；推荐水泥：粉煤灰：钢渣=1：8：15，质量分数Cw=70％～72％，减水剂添加量为水泥与粉煤灰质量总和的0．5％～1．0％。应用于华泰矿业的结果表明，该技术是可行的，钢渣的利用率高达100％，充填体的抗压强度高达2．0MPa，顶板最大下沉量仅1．207mm，未发生地表塌陷，矿石回收率达82．37％。应用该技术可以充分回收“三下”煤炭资源，具有较高的经济效益。

Through field investigation, laboratory concerning substitution of aggregate of coal gangue test and theoretical analysis, a feasibility study was carried out to figure out a solution for poten- tial hazards in mined-out areas owned by the Huatai Mining Corporation Ltd. and the problem of shortage of coal gangue aggregate faced by this mining enterprise. The physical-chemical properties, the proportion of filling materials and the cementing mechanism of filling alternatives including sand- stone, shale and steel slag were investigated. The results show that the steel slag, high in both com- pressive and tensile strength, is a suitable alternative. Recommended ratio is 1：8：15 （cement to fly ash to slag）, with mass fraction being 70%- 72% , and the dosage of the adding reducing agent be- ing 0. 5% - 1.0% of the total mass of cement and fly ash. Application of this filling formula in Hua- tai Mining Corporation Ltd. proves its feasibility, with 100% steel slag utilization, 2. 0 MPa com- pressive strength, and 1. 207 millimeter maximum roof deflection. No defection is detected in the surface, and the recovery ratio is 82.37%. Application of this technique is therefore capable of re- leasing the ＂three underneath＂ coal resources to generate enormous economic benefit.