In the ever-evolving landscape of tunnel construction, a groundbreaking method known as the suspension method is making waves, particularly for large cross-section shallow-buried tunnels. This innovative approach, detailed in a recent study published in ‘High-Speed Railway,’ promises to significantly mitigate the ground surface settlements that often accompany such projects. Ground settlements pose serious risks not only to subterranean structures but also to the integrity of nearby above-ground buildings.
The lead author of the study, Guoqing Cai from the Key Laboratory of Urban Underground Engineering at Beijing Jiaotong University, emphasizes the importance of this development. “The suspension method establishes a structural connection between the tunnel’s initial support system and the surface, allowing for effective control of settlements,” Cai explains. This connection is facilitated through vertical tie rods, which play a crucial role in maintaining stability during construction.
The research draws on systematic numerical simulations based on the Harbin Subway Line 3 project, showcasing the method’s effectiveness in real-world applications. The findings indicate a gradual increase in both surface and vault settlements throughout the construction process, ultimately stabilizing upon completion. Notably, the suspension method outperforms traditional techniques like the double-side drift method and the Cross Diaphragm Method (CRD), resulting in significantly reduced surface and vault settlements.
Cai’s team didn’t stop at theoretical analysis. They implemented rigorous on-site monitoring of surface settlements and axial forces in the tie rods during construction. “Our monitored results showed great agreement with our numerical predictions, confirming the success of the project,” he noted, highlighting the method’s reliability and precision.
The implications of this research extend beyond academic interest; they present a commercial boon for the construction sector. By adopting the suspension method, companies can not only enhance construction safety but also reduce potential costs associated with surface settlement damages. This could lead to faster project completions and lower insurance premiums, ultimately making large-scale tunneling projects more economically viable.
As urban areas continue to expand and the demand for efficient transportation systems grows, the findings from this study could shape future developments in tunnel construction. The suspension method offers a pathway to not only address the challenges of ground settlements but also to inspire further innovations in engineering practices.
For those in the construction industry looking to stay ahead of the curve, this research serves as a valuable reference. With insights into settlement control and enhanced safety measures, it paves the way for a more efficient and sustainable approach to large cross-section tunneling. The full study can be found in ‘High-Speed Railway,’ a journal dedicated to advancements in rapid transit systems.
For more information on Guoqing Cai’s work, you can visit lead_author_affiliation.