淤泥固化土高浓度非牛顿浆体的输送特性

Transport characteristics of sludge solidified soil high concentration non-Newtonian slurry

疏浚工程固化处理后的淤泥属于高浓度非牛顿浆体。通过淤泥固化土的流动度试验,采用H-B流变模型进行流动度二维瞬态数值模拟,确定其屈服应力值。采用水固比为0.8、0.9和1.0的淤泥固化土,在管道管径为150、200和250 mm,流速为1.5、2.5和3.5 m s的工况条件下,分析其水力输送特性,并拟合水力损失计算公式。结果表明,流速、黏度和管径对水力损失均有比较明显的影响,水力损失随流速和黏度的增加而增加,随管径的增加而减小。

The sludge solidification soil in the dredging project is the high concentration non-Newtonian slurry.We carry out the fluidity test of sludge solidified soil and two-dimensional transient numerical simulation by the H-B rheological model,and determine the yield stress.We use the sludge solidified soils with water-solid ratios of 0.8,0.9 and 1.0,at 150,200,250 mm pipeline diameters,under the velocities of 1.5,2.5 and 3.5 m s respectively,analyze the hydraulic transport characteristics,and fit the formula for calculating the hydraulic loss.The results show that the effects of flow velocity,viscosity and pipeline diameter on hydraulic loss are obvious.Hydraulic loss increases with the increase of flow velocity and viscosity,and decreases with the increase of pipeline diameter.