【摘要】 针对金川矿山废石-棒磨砂混合骨料充填料浆存在的离析问题,通过优化混合骨料级配来控制料浆的离析率。首先,对充填骨料进行物化分析及级配分析,通过堆积密实度试验确定混合骨料配比,以WeyMouth粒子干涉理论为基础设计8种级配的混合骨料,并以此进行料浆离析试验;其次,基于Fuller公式建立混合骨料粒径连续分布模型,结合统计学基本原理建立平均粒径和粒径分散系数2个级配表征参数。然后,根据离析试验结果,以屈服应力为条件,确定混合骨料平均粒径和粒径分散系数。最后,以金川矿山充填材料进行验证试验。研究结果表明:在废石与棒磨砂质量比为7:3,屈服应力为50～60 Pa条件下,满足混合骨料高浓度料浆管道自流输送的离析率为16.76%～21.55%,由此确定混合骨料的平均粒径为4.99～5.39 mm,粒径分散系数为1.42～1.45。当料浆质量分数为80%时,级配T1和T2的离析率分别为16.38%和17.04%,与界定值16.76%～21.55%相比较,相对误差分别为1.17%和2.28%,说明确定的混合骨料级配参数范围具有一定的可靠性。更多还原

【Abstract】 In order to solve the problem of segregation in the mixed aggregate filling slurry of Jinchuan mine waste rock and sanding, the segregation of slurry was controlled by optimizing the particle size distribution of mixed aggregate. Firstly, the physicochemical analysis and gradation analysis of filling aggregate were carried out,and the mixture ratio was determined by packing density test. Based on Wey-Mouth particle interference theory,eight kinds of graded aggregate were designed and used for slurry segregation test. Secondly, the continuous distribution model of aggregate particle size was established based on Fuller formula. Based on the basic principles of statistics, two grading parameters of average particle size and particle dispersion coefficient were established. Then, according to the segregation test results, the average particle size and particle size dispersion coefficient of the aggregate mixture under the condition of yield stress were determined. Finally, the Jinchuan mine filling material was used for the verification test. The results show that the mixture ratio of the mixed aggregate is 7:3. With the yield stress of 50-60 Pa, the segregation rate of the self-conveyed slurry meeting the high-concentration slurry pipeline of mixed aggregate is 16.76%-21.55%. The average particle size of the material is 4.99-5.39 mm, and the particle size dispersion coefficient is 1.42-1.45. The segregation rates of gradation T1 and T2 at the 80% slurry mass fraction are 16.38% and 17.04%, respectively. Compared with the defined 16.76%to 21.55%, the relative errors are 1.17% and 2.28%, respectively, which shows that the range of aggregate gradation parameter determined by the study has a certain reliability.更多还原