尾砂胶结充填材料的流动性和强度是决定充填质量和效果的 2个最为重要的性能指标。研究了复合外加剂（主要为液体硅酸钠和减水剂等）的掺入对二道沟金矿全尾砂胶结充填材料流动性和强度的改善效果。结果表明：塌落度与料浆浓度间存在明显的非线性关系。料浆浓度越高，料浆浓度的增加造成的流动性降幅越大。复合外加剂能够显著改善全尾砂充填料浆的流动性，随着料浆浓度和灰砂比的增加，复合外加剂对充填料浆流动性改善效果愈显著。灰砂比和龄期显著影响着复合外加剂对强度的改善效果，而料浆浓度影响基本可以忽略；灰砂比和龄期对复合外加剂改善效果存在着耦合影响。在实际生产中，可以考虑使用外加剂来提高充填体强度，可以大幅降低水泥用量，节省充填成本。

The fluidity and strength of cemented tailings backfill materials are 2 of the most critical performanceindicators that determine the quality and effectiveness of backfilling. This study investigates the effects of incorporatingcompound additives that are mainly liquid sodium silicate and water reducers on improving the fluidity and strength ofcemented ungraded tailings backfill materials at the Erdaogou Gold Mine. The results show a clear nonlinear relationshipbetween slump and slurry concentration: the higher the slurry concentration, the greater the decrease in fluidity causedby further increases in concentration. Compound additives can significantly enhance the fluidity of ungraded tailingsbackfill slurry, with their effects becoming more pronounced as slurry concentration and cement⁃sand ratio increase.The cement⁃sand ratio and curing age have a significant influence on the strength improvement effect of compoundadditives, whereas the influence of slurry concentration is negligible. There is a coupling effect between the cementsandratio and curing age on the strength enhancement of compound additives. In practical production, the use of additives toimprove the backfill strength can significantly reduce cement consumption and lower backfilling costs.