考虑壁面滑移效应的充填料浆管道输送阻力研究

Study on the Resistance of Cemented Paste Backfill Slurry Pipeline Transport Considering Wall Slip Effect

为了探究壁面滑移效应影响下的充填料浆管道输送阻力的变化特征,建立了考虑壁面滑移效应的管道输送模型,利用Comsol数值模拟软件分析了料浆浓度、管径及灰砂比对管道阻力损失的影响。研究表明:①模型计算结果的相对误差在合理范围内,该模型用来计算考虑壁面滑移效应的充填料浆管道输送阻力是可靠的;②考虑壁面滑移效应的情况下,各因素对管道阻力的影响程度依次为管径>质量浓度>灰砂比,管径增大,壁面剪切作用力减小,颗粒迁移运动变缓,滑移效应减弱,管道输送阻力降低幅度减小;③在不同浓度范围内料浆滑移层厚度的主控因素不同,导致输送阻力随浓度增大的幅度不同;④灰砂比较低时,管道输送阻力的增长速率较低,随着灰砂比增大,管道输送阻力快速增大。以冀东地区某矿山为研究背景进行了数值模拟,得到充填料浆管道输送的最佳参数为质量浓度66%、68%,灰砂比1∶8。

In order to explore the variation characteristics of the transport resistance of cemented paste backfill(CPB)slurry under the influence of wall slip effect,a pipeline transportation model considering the effect of wall slip was established,and the influence of slurry concentration,pipe diameter and ash-sand ratio on pipeline resistance loss was analyzed by using Comsol numerical simulation software.The study shows that:① The relative error of the simulation results is within a reasonable range,and the model is used to calculate the resistance of the filling slurry pipeline by considering the wall slip effect is reliable;② Considering the wall slip effect,order of the influence degree of each factor on the pipe resistance is the pipe diameter,mass concentration and lime sand ratio,the pipe diameter is increased,the wall shearing force is reduced,and the migration movement of the particles is slower and slipper,the shift effect is weakened,and the decrease in the resistance of the pipeline is reduced;③ The main controlling factors of the thickness of the slurry slip layer in different concentration ranges are different,which leads to different amplitudes of transport resistance increase with concentration;④ When the cement to tailings ratio relatively low,the growth rate of the pipeline transportation resistance is low,as the cement to tailings ratio increases,the pipeline transportation resistance increases rapidly.Numerical simulation was carried out with a mine in Eastern Hebei Province as the study background,and the best parameters for pipeline transportation of filler slurry are determined as concentration 66%,68%,and the cement-sand ratio is 1-8.