泥浆流变模型对泥水盾构排浆管道压力损失特性的影响分析

Analysis of the Effect of Slurry Rheological Model on the Pressure Loss Characteristics of Slurry Discharge Pipe of Slurry Shield

为探明泥浆的流变模型对泥水盾构管道压力损失计算结果的影响,运用CFD-DEM耦合的方法,建立三维瞬态泥浆-渣石多相流耦合模型,分析泥水盾构排浆管道压力损失特性。耦合模型中各流变模型的流变参数通过流变试验确定,渣石的形状与尺寸通过3D扫描技术获得。此外,通过与模型试验结果对比,分析不同流变模型的适用性及计算结果的准确性。结果表明,对于泥浆-颗粒两相流的管道压力损失求解问题,H-B模型计算结果的误差最小,约为6%;Bingham模型计算结果的误差次之,约为8%;Power law模型计算结果的误差最大,约为18%。因此,对计算精度要求较高的数值计算,泥浆流变模型建议选用H-B模型;综合考虑计算精度与计算时间成本,泥浆流变模型建议选用Bingham模型。

In order to ascertain the effect of slurry rheological model on the results of pipe pressure loss calculation of slurry shield,the three-dimensional transient slurry-muck multiphase flow coupling model has been created by us⁃ing the CFD-DEM coupling method,the pressure loss characteristics of slurry discharge pipe of slurry shield are identified,the rheological parameters of the rheological model in the coupling model are determined through rheolog⁃ical test,and the shape and size of muck are determined through 3D scanning.In addition,through comparison with the model test results,the applicability of the rheological model and the accuracy of the calculation results have been analyzed.As the study results indicate:in solving the pipe pressure loss of slurry-particle two-phase flow,the calculation results of H-B model have the smallest error,which is about 6%,the calculation results of Bingham mod⁃el have the second-smallest error,which is about 8%,and the calculation results of Power law model have the great⁃est numerical error,which is about 18%.Therefore,for the numerical calculation that has the highest requirement for calculation accuracy,the H-B model is recommended for the slurry rheological model.With comprehensive con⁃sideration of the calculation accuracy and the time cost of calculation,the Bingham model is recommended for the slurry rheological model.