The strength of cemented backfill is one of the important indexes affecting the filling effect. There are many factors that affect the strength of cemented backfill. In order to explore the influence law of the cemented backfill strength, firstly, the strength test of cemented backfill with mixed aggregate was carried out on the basis of physical and chemical analysis of test materials and the particle size distribution analysis of mixed aggregate. Then, according to the test results, the effects of particle size distribution of mixed aggregate, solid mass concentration C_w,%, cement content B_w,%, and their interaction on the strength of backfill were analyzed. Finally, the strength model of cemented backfill with mixed aggregate was established by using industrial filling parameters such as aggregate gradation, solid mass concentration C_w,%, and cement content B_w,%, and the reliability of the model was analyzed, and the model verification test was carried out. The results show that the strength of cemented backfill is affected by single factors such as aggregate gradation, solid mass concentration C_w,%, and cement content B_w,% and is also affected by the interaction of these factors. Except for a few points, the relative error of the model is less than 10%. The verification test results show that the average relative error values of 3-day, 7-day, and 28-day strength of cemented backfill with mixed aggregate are 6.32%, 2.46%, and 0.92%, respectively, which shows that the model has a good applicability for predicting the strength of the backfill with mixed aggregate in Jinchuan mine.

胶结回填的强度是影响填充效果的重要指标之一。有许多因素影响胶结回填的强度。为了探究水泥回填土强度的影响规律，首先，在试验材料的理化分析和混合骨料的粒度分布分析的基础上，进行了混合骨料对水泥回填土的强度试验。然后，根据测试结果，对混合骨料的粒径分布，固体质量浓度C _w，％，水泥含量B _{w，％的影响}，并分析了它们在回填强度上的相互作用。最后，利用骨料级配，固体质量浓度C _w，％和水泥含量B _w，％等工业填充参数建立了混合骨料回填水泥的强度模型，并分析了模型的可靠性，进行了模型验证测试。结果表明，水泥回填的强度受诸如骨料级配，固体质量浓度C _w，％和水泥含量B _w，％等单个因素的影响。并且还受这些因素相互作用的影响。除少数几点外，模型的相对误差均小于10％。验证测试结果表明，混合骨料胶结回填的3天，7天和28天强度的平均相对误差值分别为6.32％，2.46％和0.92％，表明该模型具有有很好的预测金川矿混合骨料回填强度的适用性。