粉煤灰膏体充填材料工作性能影响因素研究

Study on Influencing Factors of Working Performance of Fly Ash Paste Filling Materials

为促进充填开采的推广应用,采用正交试验的方法,通过泌水率、坍落度和单轴抗压强度试验,研究了料浆质量浓度、矸石粒径、矸灰比和粉煤灰替代率对粉煤灰基膏体充填材料输送和力学性能指标的影响规律,给出了当前试验阶段充填材料的最佳配比。结果表明:料浆质量浓度是输送性能的主控因素,粉煤灰替代率和矸灰比次之,矸石粒径的影响较小;料浆质量浓度也是力学性能的主控因素,矸灰比次之,粉煤灰替代率和矸石粒径的影响较小;现阶段粉煤灰基膏体充填材料的较优配比为80%料浆质量浓度、0~5mm矸石粒径、1.0矸灰比以及30%粉煤灰替代率。研究成果对于降低充填成本具有重要意义。

In order to promote the popularization and application of filling mining,the orthogonal test method was adopted to study the effects of slurry mass concentration,gangue particle size,gangue-ash ratio and fly ash replacement rate on the transportation and mechanical properties of fly ash paste filling materials through tests of water loss rate,slump and uniaxial compression.The optimal ratio of filling materials in the current experimental stage was given.The results show that the slurry mass concentration is the main factor of transportation performance,followed by fly ash replacement rate and gangue-ash ratio,and the influence of gangue particle size is small.Slurry mass concentration is also the main factor of mechanical properties,followed by gangue-ash ratio,and the effects of fly ash replacement rate and gangue particle size are relatively small.At present,the optimal ratio of fly ash paste filling materials is slurry mass concentration of 80%,gangue particle size of 0-5mm,gangue ash ratio of 1.0and fly ash replacement rate of 30%.The research results are of great significance for reducing the filling cost.