中南大学学报（自然科学版）2017，Vol.48Issue(11)：2889-2896,8.DOI:10.11817/j.issn.1672-7207.2017.11.007
泥水盾构环流系统管道输送特性
Transport characteristics of shield slurry system
摘要
Abstract
To study the pipeline transport characteristics of slurry shield circulation system and determine the selection range of the operation parameters (pipeline entrance velocityvi, ballast sized, ballast volume fractionφ, slurry viscosity μ and slurry densityρ) according to the practical construction situation, the simulation model of ballast motion characteristics was built by using CFD software coupled with discrete element software. The influence of five operating parameters on fluid pressure lossΔp in pipe and average ballast transportation velocityvs was obtained through the simulation. The results show that the pipeline entrance velocityvi has the greatest impact on the pipeline transport characteristics of the shield slurry circulation system. The increase of the entrance velocityvi and the ballast volume fractionφ bring excessive pressure loss to the circulation system. The increase of entrance velocityvi and the slurry densityρ can effectively improve the transportation velocity of the ballast group in the pipeline. When the slurry densityρ increases from 1.0 g/cm3to 1.2, 1.4 and 1.6 g/cm3,the pressure loss Δpincreases by 7%, 17% and 26%, and the ballast transportation velocityvs increases by 18.0%, 30.0% and 39.5%, respectively. The increment of transportation velocity is larger than that of the pressure loss. The pressure loss increases with the increase of the entrance velocity and the ballast concentration, and the influence of entrance velocity on the pressure loss is greater than that on ballast volume fraction. And the movement trajectory of the ballast in the simulation model is consistent with the actual movement trajectory.关键词
泥水盾构/环流系统/颗粒运动特性Key words
slurry shield/slurry system/particle motion characteristics分类
交通工程引用本文复制引用
夏毅敏,王洋,吴遁,秦邦江,杨端,姚菁..泥水盾构环流系统管道输送特性[J].中南大学学报（自然科学版）,2017,48(11):2889-2896,8.基金项目
湖南省科技重大专项(2014FJ1002) （2014FJ1002）
国家高技术研究发展计划(863计划)项目(2012AA041803) (Project(2014FJ1002) supported by the Major Science and Technology Program of Hunan Province （863计划）
Project(2012AA041803) supported by the National High Technology Research and Development Program (863 Program) of China) （2012AA041803）
