尾砂充填料浆流变性能模型与试验研究

以地下矿山尾砂充填料为研究对象,试验研究与理论分析相结合的方法,利用R/S+流变仪和岩石力学试验机对充填料浆的流变性能进行试验研究.引入Papanastasiou黏塑性流体模型来表征尾砂充填料浆的黏度和切应力变化过程.研究结果表明:该黏塑性流体模型预测的结果和试验结果相吻合,因此可用于理论分析计算;得到不同的压力增长指数下切应力-切变速率曲线;尾砂充填料浆的黏度和屈服应力随料浆质量分数的增加而增大;同一质量分数下,胶结尾砂的黏度和屈服应力比全尾砂大.通过对充填料浆流变性能的研究,为矿山充填设计提供了理论和实验依据.

Experimental and Modeling Study on the Rheological Properties of Tailings Backfill

Taking backfill material for underground mine as the object of study， this paper aims to studying its rheological properties and strength characteristics by using the R/S+ rheometer and rock mechanics testing machine with the methods of experiment and theory analysis. And the visco-plastic fluid model of Papanastasiou was introduced to analyze the changing progress of viscosity and shear stress of tailings backfill. The results show that， the calculated results of this model were identical to the experimental results， thus it could be verified for theoretical calculation. In addition， the curve of shear stress-shearing rate at the different stress growth parameter was gotten， it is found that the viscosity and yields stress of backfilling develop with the increase of its mass concentration and the viscosity and yields stress of cementing tailings were higher than those of whole tailings at the same mass concentration. This study on rheological properties of tailings backfill are useful for designing filling station in mine.