粗骨料充填料浆泌水特性及其对充填体性能的影响

Bleeding Characteristics of Coarse Aggregate Filling Slurry and Its Influence on the Performance of Backfill

为分析粗骨料料浆泌水率在不同影响因素下的变化特征和泌水率与料浆坍落度之间的关系,在室内开展了粗骨料充填料浆泌水率特性的试验研究。分析了物料组成、质量浓度及水泥含量对料浆泌水率的影响规律,并进一步探索了粗骨料料浆泌水率与坍落度之间的关系。结果表明:尾砂料浆泌水率随着料浆浓度的不断增大呈现不断降低的趋势,并且泌水率的降幅随着水泥掺量的增加逐渐降低;当泌水率相近时,尾砂料浆的质量浓度明显低于粗骨料料浆的质量浓度,说明掺入废石后能够有助于矿山实现高浓度料浆充填;粗骨料料浆的泌水率随着质量浓度的增加也呈现不断减小的趋势,但泌水率的降幅随着粗骨料掺量的增加呈不断减小的趋势;料浆的泌水率随着水泥含量的增加不断降低,并且浓度的增加会导致泌水率的降幅出现增大趋势;料浆的坍落度随着泌水率的增加表现出逐渐增大趋势。因此,可通过泌水率参数的变化定性判断料浆的输送性能。

In order to analyze the variation characteristics of bleeding rate of coarse aggregate slurry under different influencing factors and the relationship between bleeding rate and slurry slump,an experimental study on the characteristics of bleeding rate of coarse aggregate filling slurry was carried out in the laboratory.The effects of material composition,mass concentration and cement content on the bleeding rate of slurry were analyzed,and the relationship between the bleeding rate of coarse aggregate slurry and slump was further explored.The results show that the bleeding rate of tailings slurry decreases with the increase of slurry concentration,and the decrease of bleeding rate gradually decreases with the increase of cement content.When the bleeding rate is similar,the mass concentration of tailings slurry is significantly lower than that of coarse aggregate slurry,indicating that the incorporation of waste rock can help the mine to achieve high concentration slurry filling.The bleeding rate of coarse aggregate slurry also showed a trend of decreasing with the increase of mass concentration,but the decrease of bleeding rate showed a trend of decreasing with the increase of coarse aggregate content.The bleeding rate of slurry decreases with the increase of cement content,and the decrease of bleeding rate increases with the increase of concentration.The slump of slurry gradually increases with the increase of bleeding rate.Therefore,the transport performance of slurry can be qualitatively judged by the change of bleeding rate parameter.