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Simulation of screening characterization of double-deck vibrating screen of slurry TBM tunnelling using integrated CFD-DEM-FEM
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-21 , DOI: 10.1016/j.tust.2025.106399
Yidong Guo, Yingran Fang, Xinggao Li, Dalong Jin, Hongzhi Liu

To evaluate and optimize the screening characterization of double-deck vibrating screen of slurry TBM tunnelling, a three-dimensional (3D) coupled model of vibrating screen was established based on an integrated CFD-DEM-FEM method in this paper. The transport characteristics of particles and the fluidity of slurry were revealed, and the kinetic response of the screen surfaces was comprehensively analyzed. The results indicated that the particles were evenly distributed on the screen surface, and the velocity of the particles shows a trend of a steady increase in velocity from 0 m/s to 5 m/s. The coarse screen experienced impact forces up to 90 times greater than those on the fine screen, influenced by particle bed formation and collision dynamics, which reduced direct loads on the screen surface. Screening efficiencies of coarse and fine screens stabilized at approximately 61 % and 73 %, with coarse screens exhibiting greater efficiency fluctuations due to the particle size distribution and collisions. The stress and deformation primairly concentrate in the middle position of the screen surface near the feed and discharge ends, highlighting the need for structural reinforcements to enhance strength and stiffness. Lastly, the optimization schemes for each parameters were proposed, and applied to the slurry TBM tunnelling of Qingdao Jiaozhou Bay Second Undersea Tunnel. The findings in this work provide references and suggestions on the efficient operation of double-deck vibrating screen for slurry TBM tunnelling.

中文翻译:


使用集成 CFD-DEM-FEM 模拟泥水隧道掘进双层振动筛的筛分特性



为评价和优化泥水隧道掘进双层振动筛的筛分特性,本文基于集成 CFD-DEM-FEM 方法建立了振动筛三维 (3D) 耦合模型。揭示了颗粒的传输特性和浆料的流动性,并综合分析了筛网表面的动力学响应。结果表明,颗粒物均匀分布在筛面上,颗粒物的速度呈从 0 m/s 到 5 m/s 的稳定增速趋势。受颗粒床形成和碰撞动力学的影响,粗筛网承受的冲击力比细筛网高 90 倍,从而减少了筛网上的直接载荷。粗筛和细筛的筛分效率稳定在大约 61% 和 73% 左右,由于粒度分布和碰撞,粗筛的效率波动更大。应力和变形主要集中在筛面的中间位置,靠近进料端和出料端,突出了结构加固以提高强度和刚度的必要性。最后,提出了各参数的优化方案,并应用于青岛胶州湾第二海底隧道泥水TBM掘进。研究结果为泥水态TBM掘进双层振动筛的高效运行提供了参考和建议。
更新日期:2025-01-21
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