In a groundbreaking study published in ‘Chengshi guidao jiaotong yanjiu’ (Research on Urban Traffic Engineering), researchers from Shanghai University have unveiled critical insights into the effects of shield tunneling on existing underground structures. This research, spearheaded by Yuan Xiao from the School of Mechanics and Engineering Science, highlights the challenges and solutions associated with cutting through diaphragm walls during metro station construction.
As urban areas continue to expand and the demand for efficient public transport rises, the construction of underground metro systems becomes increasingly complex. The study focuses on the super-large diameter shield tunnel project at Nanjing Jianning West Road, which intersects with the diaphragm wall of an existing metro station. This intersection poses significant risks, including ground settlement and structural deformation, which can lead to costly delays and safety concerns.
Yuan Xiao emphasizes the importance of understanding these impacts: “Our research indicates that the existing pile foundations play a crucial role in controlling settlement. The interaction between the shield tunneling and the diaphragm wall can cause substantial ground movement, which must be carefully managed to ensure structural integrity.” The study reveals that when the shield cuts through the lower part of the pile foundation, significant surface settlement occurs, creating a settlement trough that can lead to uneven ground conditions.
The implications of these findings extend beyond academic interest; they present vital information for construction firms engaged in similar projects. By utilizing the predictive results from this simulation analysis, companies can optimize their construction methods and monitoring strategies, minimizing risks associated with underground engineering. This could lead to more efficient project timelines and reduced costs, ultimately benefiting stakeholders and the public.
Moreover, the research highlights that while the shield cutting through the diaphragm wall can cause differential settlement of the metro line, it remains within safety control indices. This assurance is crucial for urban planners and engineers who need to balance the demands of infrastructure development with public safety.
As cities grapple with the dual challenges of aging infrastructure and the need for modernization, studies like Yuan’s provide a roadmap for navigating these complexities. The findings not only contribute to the academic field but also serve as a practical guide for construction professionals looking to enhance safety and efficiency in underground projects.
For further insights into this research, you can visit the School of Mechanics and Engineering Science, Shanghai University.