基于FLOW-3D的砂性尾矿浆自然冲积分选计算

CALCULATION OF NATURAL ALLUVIAL SEPARATION OF SANDY TAILINGS SLURRY BASED ON FLOW-3D

  • 摘要: 上游式尾矿库滩面的运行坡度与颗粒分区影响防洪安全与坝体稳定。为了准确量化滩面的尾矿颗粒沉积特征,针对粗颗粒砂性尾矿,提出了基于FLOW-3D泥沙冲积理论的计算方法。经尾矿浆自由沉降算例与试验验证,计算方法具有很好的可靠性,计算精度满足工程要求。设定流槽计算系统模拟滩面运行,计算不同入库浓度下滩面的沉积分选特征。结果表明:尾矿库干滩面的几何形态和颗粒沉积特征,与尾矿的级配、排放浓度密切相关。入库浓度越大,滩面形态越复杂,越易形成陡坎深坑,颗粒物沉积范围越小,分选性越差。

     

    Abstract: The slope and particle zoning of the tailings pond beach affect the safety of flood control and the stability of the dam body. In order to accurately quantify the sedimentary characteristics of tailings particles on the beach, a calculation method based on the FLOW-3D sediment alluvial theory is proposed for coarse-grained sandy tailings. The calculation method of the free settlement of tailings slurry and the experimental verification show that the calculation method has good reliability and the calculation accuracy meets the engineering requirements. The flow trough calculation system is set to simulate the operation of the beach surface, and the sedimentation and sorting characteristics of the beach surface under different inflow concentrations are calculated. The calculation shows that the geometric shape and particle deposition characteristics of the dry beach surface of the tailings pond are closely related to the particle size composition and slurry concentration. Specifically, large concentration of tailings and steep beach slope tends to incur more complex morphology. Shorter particle deposition distance renders smaller partition range of coarse particles.

     

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