Experimental and Resistance Characterization Study of Yransparent L-tube for Graded Tailing Backfill Slurry
Pipe transport resistance is an important parameter of backfill slurry for pipeline transport,and the Buckingham formula based on Bingham's rheological model is commonly used for calculation,and the influence of pipe wall slip effect is ignored in the formula,leads to produce certain deviation pipeline resistance calculation.So this paper proposes a method for calculating the rheological parameters of filling slurry and transport resistance considering the influence of pipe wall slip effect based on the transparent L-pipe conveying experiments,and adopts a comprehensive experimental design scheme to study the effect of slurry mass fraction,cement-tailing ratio on pipe wall slip effect and backfill slurry pipe transport resistance.Using a comprehensive experimental design scheme,the influence of slurry mass fraction and gray-to-sand ratio on the wall slip effect and filling slurry conveying resistance was investigated.The results show that pipe transport resistance is positively correlated with mass fraction and lime sand ratio,and negatively correlated with pipe wall slip effect.The slippage effect is quantified by the slippage contribution degree,which is significantly affected by the mass fraction and gradually decreases with the increase of the mass fraction.When the mass fraction is small,the influence of the lime sand ratio is not obvious.Through regression analysis,a mathematical model of backfill slurry pipe transport resistance was constructed based on the four variables of pipe diameter,flow rate,mass fraction,and cement-tailing ratio,taking into account the wall-slip effect,which is convenient for guiding the engineering practice.
backfill slurryl tube experimentpipeline resistancewall slipresistance model
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