尹升华, 闫泽鹏, 严荣富, 李德贤, 赵国亮, 张鹏强. 全尾砂‒废石膏体流变特性及阻力演化[J]. 工程科学学报, 2023, 45(1): 9-18. DOI: 10.13374/j.issn2095-9389.2021.07.31.002
引用本文: 尹升华, 闫泽鹏, 严荣富, 李德贤, 赵国亮, 张鹏强. 全尾砂‒废石膏体流变特性及阻力演化[J]. 工程科学学报, 2023, 45(1): 9-18. DOI: 10.13374/j.issn2095-9389.2021.07.31.002
YIN Sheng-hua, YAN Ze-peng, YAN Rong-fu, LI De-xian, ZHAO Guo-liang, ZHANG Peng-qiang. Rheological properties and resistance evolution of cemented unclassified tailings-waste rock paste backfill[J]. Chinese Journal of Engineering, 2023, 45(1): 9-18. DOI: 10.13374/j.issn2095-9389.2021.07.31.002
Citation: YIN Sheng-hua, YAN Ze-peng, YAN Rong-fu, LI De-xian, ZHAO Guo-liang, ZHANG Peng-qiang. Rheological properties and resistance evolution of cemented unclassified tailings-waste rock paste backfill[J]. Chinese Journal of Engineering, 2023, 45(1): 9-18. DOI: 10.13374/j.issn2095-9389.2021.07.31.002

全尾砂‒废石膏体流变特性及阻力演化

Rheological properties and resistance evolution of cemented unclassified tailings-waste rock paste backfill

  • 摘要: 为了研究全尾砂‒废石膏体的管道输送特性,采用流变仪测试了不同尾砂‒废石质量比(尾废比)及固体质量分数条件下膏体的流变特性,构建了综合考虑密实度、灰砂比及体积分数的输送阻力方程。将该方程代入Comsol软件中进行模拟计算并与环管实测结果进行对比验证,数值模型所测误差均在7%以内,说明该模型用于计算全尾砂‒废石膏体的阻力特性是合理的,还模拟了不同浓度、尾废比及初始速度条件下管道输送阻力的变化特征。实验结果表明:塑性黏度和屈服应力随着粗骨料膏体固体质量分数和尾废比的增加而增大;由于颗粒间的摩擦效应导致阻力损失随尾废比的增加呈先增大后减小的趋势,阻力损失在尾废比5∶5处取得最小值;固体质量分数增大导致水含量的降低,使粗骨料浆体难以流动,从而导致阻力损失快速增长;初始流速增加,颗粒运动变得不稳定,摩擦加剧,并于“拐点”—2.2 m·s−1处阻力损失的增长率大大提高。研究成果对于粗骨料膏体管输系统的设计具有一定借鉴意义。

     

    Abstract: Coarse aggregate paste filling is the core direction of today’s mine development. The coarse aggregate filling can effectively reduce the discharge of the solid mine waste, which is conducive to the realization of safe, clean, and efficient mining of the deposit and can also reduce the production costs of infill mining and promote the coordinated development of green mining. To study the pipeline conveying characteristics of the tailing‒waste rock paste, the rheological properties were tested by a rheometer under different tailing‒waste rock ratios and solid content conditions. A resistance equation integrating the compactness, water‒cement ratio, and volume concentration was constructed. This was then brought into the Comsol software for simulations and compared with the actual measurement results of the ring pipe. Errors measured by the numerical model are verified to be all within 7%, indicating that the model reasonably calculated the resistance characteristics of the tailing-waste rock paste. Variation characteristics of the pipeline conveying resistance under different solid contents, tailing‒waste rock ratios, and initial velocity conditions were also simulated. Experimental results show that the plastic viscosity and yield stress increase with the solid content and tailing‒waste rock ratio. Due to the friction effect between the particles, the resistance loss tends to increase and then decrease with the tailing‒waste rock ratio. The increase in the solid content leads to a decrease in the water content of the paste, which consequently results in difficulty in the flow of coarse aggregate slurry and a rapid increase in the resistance loss. The initial flow rate increases, the particle motion becomes unstable, the friction increases, and the growth rate of the drag loss increases greatly after the “inflection point” of 2.2 m·s−1. It is recommended that the mine should be filled with a tailing‒waste rock ratio of 5∶5 and an initial flow rate of 2.2 m·s−1. The results have certain reference significance for the design of a coarse aggregate paste pipeline conveying system, which helps the development of coarse aggregate paste conveying technology and also has a positive effect on reducing the pipeline conveying resistance and extending the conveying distance.

     

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