基于灰色理论的膏体充填料浆凝结性及流动性分析

Coagulability and fluidity of paste slurry with unclassified tailings-gobi aggregates based on gray theory

膏体料浆的强度是评价充填质量的重要指标,屈服应力是管道输送系统设计的基础。将砂灰比、质量浓度及尾废比(尾砂与戈壁集料比)视为一个灰色系统,运用灰色关联度分析方法,研究3个影响因素与膏体强度及屈服应力之间的关系。分别建立了28d抗压强度、屈服应力与砂灰比、质量浓度及尾废比的灰色模型GM(1,4),确定出最优充填料浆配比。分析结果表明,砂灰比对抗压强度影响最大,质量浓度次之,尾废比最小;质量浓度对屈服应力影响最大,尾废比次之,砂灰比最小。28d抗压强度及屈服应力GM(1,4)灰色模型精度分别为93.41%、94.24%,充填料浆砂灰比为5、质量浓度为78%、尾废比为6时,满足强度及流动性要求,为最佳充填配比。此研究为矿山确定合理充填配比、减少充填成本提供了理论依据。

Strength of paste slurry is the key index for evaluating filling quality, yield stress is the fundament for pipeline system design. Sand cement ratio, concentration and tailings-gobi aggregates can be considered as a gray system, the relationship between the three influencing factors with strength and yield stress of paste is researched by eorrelativity analysis method. The gray models GM（1,4）between 28 d compressive strength and yield stress with sand cement ratio, concentration and tailings-gobi aggregates are founded respectively, the optimal filling slurry ratio is determined. The analysis shows that sand cement ratio has the most influence on compressive strength, concentration is in the second place, the last is tailings-gobi aggregates, and concentration has the most influence on yield stress, tailings-gobi aggregates is in the second place, the last is sand cement ratio. The precision of compressive strength and yield stress gray system GM（1,4） is 93.41% and 94.24%, the optimal filling ratio show that sand cement ratio is 5, concentration is 78% and tailings-gobi aggregates is 6, meeting the requirements of strength and fluidity. The research can provide theoretical basis for determining reasonable filling ratio and reducing filling cost.