Numerical Simulation of Visualized Grout Diffusion in Backfill-grouting of Shield Tunnel DOI Creative Commons

Yihan Zhou,

Fei Sun, Di Zhang

et al.

E3S Web of Conferences, Journal Year: 2025, Volume and Issue: 618, P. 02020 - 02020

Published: Jan. 1, 2025

Synchronous grouting in shield tunnel construction plays a critical role enhancing impermeability, ensuring precise alignment of segment rings, and mitigating surface settlement. Despite its importance, limited research has been conducted on the visualization numerical simulations for behind wall. This study addresses this gap by simulating diffusion process during post-grouting using CFDEM software. The simulation results reveal that grout injected from upper opening initially diffuses hemispherical pattern centered at injection point subsequently migrates downward along outer diameter under influence gravity. Conversely, lower outlet rapidly fills annular transitions to permeation phase. At volume 100%, slurry coverage area reaches 62.5%, with waste 37.4%. When increases 200%, marginally improves 73.1%. Balancing effectiveness costs, optimal effect is achieved as excessive will not be greatly improved leads substantial material waste. To achieve complete coverage, particularly unfilled regions head sides, secondary recommended instead further increasing initial volume. approach minimizes while maintaining efficiency.

Language: Английский

A K-Dimensional Tree–Iterative Closest Point Algorithm for Overbreak and Underbreak Assessment of Mountain Tunnels DOI Creative Commons
Zhao Han, Xiongyao Xie, Genji Tang

et al.

Applied Sciences, Journal Year: 2025, Volume and Issue: 15(2), P. 566 - 566

Published: Jan. 9, 2025

With the increasing scale of mountain tunnel construction, control tunnelling quality is becoming a major concern. The efficient and accurate assessment overbreak underbreak vital to evaluation optimization quality, but remains challenge. Thus, this paper proposes an method for based on K-dimensional (KD) tree Iterative Closest Point (ICP) algorithm. Firstly, point clouds are acquired using laser scanning during 3D modeling performed. Secondly, as-designed models converted into registered with as-built improved ICP algorithm KD searching. Thirdly, through registration, deviation between calculated, providing tunnelling. Finally, effectiveness proposed validated by data from ultra-long tunnel. Compared other methods, merits include following: (a) detailed comprehensive can be efficiently (b) promising accuracy (over 90%) obtained.

Language: Английский

Citations

0
Numerical Simulation of Visualized Grout Diffusion in Backfill-grouting of Shield Tunnel DOI Creative Commons

Yihan Zhou,

Fei Sun, Di Zhang

et al.

E3S Web of Conferences, Journal Year: 2025, Volume and Issue: 618, P. 02020 - 02020

Published: Jan. 1, 2025

Synchronous grouting in shield tunnel construction plays a critical role enhancing impermeability, ensuring precise alignment of segment rings, and mitigating surface settlement. Despite its importance, limited research has been conducted on the visualization numerical simulations for behind wall. This study addresses this gap by simulating diffusion process during post-grouting using CFDEM software. The simulation results reveal that grout injected from upper opening initially diffuses hemispherical pattern centered at injection point subsequently migrates downward along outer diameter under influence gravity. Conversely, lower outlet rapidly fills annular transitions to permeation phase. At volume 100%, slurry coverage area reaches 62.5%, with waste 37.4%. When increases 200%, marginally improves 73.1%. Balancing effectiveness costs, optimal effect is achieved as excessive will not be greatly improved leads substantial material waste. To achieve complete coverage, particularly unfilled regions head sides, secondary recommended instead further increasing initial volume. approach minimizes while maintaining efficiency.

Language: Английский

Citations

0