Journal of Shandong University(Engineering Science) ›› 2025, Vol. 55 ›› Issue (2): 114-124.doi: 10.6040/j.issn.1672-3961.0.2024.040

• Civil Engineering • Previous Articles     Next Articles

Research on pebble slagging stagnation of slurry balance shield drain pipe based on CFD-DEM coupling

TONG Li1,3, LI Da2*, LI Shuchen1, PENG Kefeng1,3, CHEN Yi1,3   

  1. 1. School of Qilu Transportation, Shandong University, Jinan 250002, Shandong, China;
    2. China Railway Fourth Survey and Design Institute Group Co., Ltd., Wuhan 430063, Hubei, China;
    3. Institute of Geotechnical and Underground Engineering, Shandong University, Jinan 250061, Shandong, China
  • Published:2025-04-15

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Abstract: Three-dimensional modeling was carried out for the curved pipeline of slurry balance shield, and numerical simulation was carried out using CFD-DEM coupling to reveal the migration law of pebbles carried by slurry, analyze the causes of the slagging stagnation of pebbles, explore the influence of pebble deposition on the flow field in the pipeline, and provide optimization guidance for the solution of the delayed drainage problem in field construction. The results showed that the problem of slagging stagnation was due to the low drag force provided by the low flow rate slurry, and a large number of particles were deposited at the bend of the pipeline. The larger the curved pipe was, the later the critical pointed at which the particle formation velocity and slagging velocity reached the dynamic equilibrium, indicating that the more the number of deposit particles. Particle deposition made the effective flow area smaller, the slurry flow rate was obviously stratified, and the stratification of flow field was more unfavorable to the migration of sediment particles at the bottom, which aggravated the problem of hysteresis. The larger the viscosity of the slurry, the greater the drag force of the particles between slurry, and the larger the average migration velocity of the particles. Slurry density had little effect on the horizontal movement of particles, but when particles were transported upward, slurry density could provide higher buoyancy, which was conducive to preventing the stagnation of particles.

Key words: slurry balance shield, slagging stagnation, CFD-DEM, pebble transport

CLC Number: 

  • TU94
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