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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第11期    总第279期    2017年11月

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文章编号:1672-7207(2017)11-2889-08
泥水盾构环流系统管道输送特性
夏毅敏1, 2,王洋1, 2,吴遁3,秦邦江4,杨端1, 2,姚菁1, 2

(1. 中南大学 高性能复杂制造国家重点实验室,湖南 长沙,410083; 2. 中南大学 机电工程学院,湖南 长沙,410083; 3. 中铁十四局隧道工程有限公司,山东 济南,250013; 4. 中国铁建重工集团有限公司,湖南 长沙,410100)

摘 要: 为研究泥水盾构环流系统管道输送特性,根据实际施工情况确定操作参数(管道入口流速vi、石碴粒径d、石碴体积分数φ、浆液黏度μ和密度ρ)的选取范围,采用流体力学软件与离散元软件耦合方法建立管道内石碴运动模型,通过仿真研究5个操作参数对环流系统管道压力损失Δp和石碴群输送速度vs的影响规律。研究结果表明:vi对环流系统管道输送速度影响最大;增大vi与φ给环流系统带来较大的压力损失;增大vi和ρ能够有效提升管道内石碴输送速度;当浆液密度从ρ=1.0 g/cm3增大至1.2,1.4和1.6 g/cm3时,Δp增幅分别为7.0%,17.0%和26.0%,石碴群输送速度vs增幅分别为18.0%,30.0%和39.5%,vs增幅大于Δp增幅;Δp随vi和φ的增大而增大,且vi对Δp的影响程度大于φ对Δp的影响程度;仿真模型中石碴运动轨迹与实际工程具有一致性。

 

关键词: 泥水盾构;环流系统;颗粒运动特性

Transport characteristics of shield slurry system
XIA Yimin1, 2, WANG Yang1, 2, WU Dun3, QIN Bangjiang4, YANG Duan1, 2, YAO Jing1, 2

1. State Key Laboratory of High Performance Complex Manufacturing, Central South University,Changsha 410083, China; 2. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; 3. China Railway 14th Bureau Group of the Tunnel Engineering Co. Ltd., Jinan 250013, China; 4. China Railway Construction Group Co. Ltd., Changsha 410100, China

Abstract:To study the pipeline transport characteristics of slurry shield circulation system and determine the selection range of the operation parameters (pipeline entrance velocity vi, ballast size d, ballast volume fraction φ, slurry viscosity μ and slurry density ρ) 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 loss Δp in pipe and average ballast transportation velocity vs was obtained through the simulation. The results show that the pipeline entrance velocity vi has the greatest impact on the pipeline transport characteristics of the shield slurry circulation system. The increase of the entrance velocity vi and the ballast volume fraction φ bring excessive pressure loss to the circulation system. The increase of entrance velocity vi and the slurry density ρ can effectively improve the transportation velocity of the ballast group in the pipeline. When the slurry density ρ increases from 1.0 g/cm3 to 1.2, 1.4 and 1.6 g/cm3, the pressure loss Δp increases by 7%, 17% and 26%, and the ballast transportation velocity vs 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.

 

Key words: slurry shield; slurry system; particle motion characteristics

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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