研究了不同粒度的粉煤灰对充填料浆的流变性能和强度性能的影响。以贵州某煤矿的煤矸石、粉煤灰和水泥为原料,制备了不同灰砂比、不同粒度的粉煤灰和不同浓度的充填料浆,通过流变仪和压力试验机,分别测试了充填料浆的流变性能和强度性能。结果表明,灰砂比对料浆的流变性能有显著影响,随着灰砂比的增大,料浆的屈服应力和黏度系数都急剧上升,导致料浆的流动性能降低;粉煤灰粒度对料浆的流变性能和充填体强度都有一定影响,但影响程度不同,在一定粒级范围内,粉煤灰粒度对料浆的流动性的影响要大于对强度的影响;质量浓度与粉煤灰粒度的耦合影响表明,质量浓度对料浆的流变性能和充填体强度的影响都远大于粉煤灰粒度的影响,粉煤灰对充填体强度的影响随着养护周期的增加而增大。研究结果对于优化充填料浆的配比设计、提高充填效率和质量具有重要的理论和实际意义。

In this paper, the effects of different particle size of fly ash on the rheological and strength properties of filling slurries, as well as the coupling effects with ash-sand ratio and concentration were investigated. Using coal gangue, fly ash and cement from a coal mine in Guizhou as raw materials, filling slurries with different ash - sand ratios, different particle sizes of fly ash and different concentrations were prepared, and the rheological and strength properties of the filling slurries were tested by a rheometer and a pressure tester, respectively. The results show that the ash-sand ratio has a significant effect on the rheological properties of the slurry,with the increase of the ash-sand ratio, the yield stress and viscosity coefficient of the slurry increase dramatically, resulting in the reduction of the flow performance of the slurry; the particle size of the fly ash has a certain effect on the rheological performance of the slurry and the strength of the filling body, but the degree of influence is different, within a certain range of particle size, the effect of the particle size of the fly ash on the fluidity of the slurry is greater than that on the strength of the effect; The coupling effect of mass concentration and fly ash particle size shows that the effect of mass concentration on the rheological properties of the slurry and the strength of the filling body is much larger than that of fly ash particle size, and the effect of fly ash on the strength of the filling body increases with the increase of the maintenance period. The results of this paper have important theoretical and practical significance for optimizing the proportioning design of filling slurry and improving the filling efficiency and quality.