In the ever-evolving landscape of urban construction, the recent study on the risk prevention and structural safety of multi-line tunnel parallel construction is set to turn heads. Conducted by MA Xiaobo from the China Railway First Survey and Design Institute Group Co., Ltd., this research addresses a pressing challenge in the construction sector: the complexities of tunneling in sandstone strata.
As cities expand and the demand for efficient transportation systems grows, the construction of multi-line tunnels becomes increasingly vital. However, the excavation of subsequent tunnels can significantly disturb existing structures, leading to potential safety hazards and costly delays. MA Xiaobo’s research offers a comprehensive analysis of these risks and proposes effective strategies to mitigate them.
“During the parallel construction of multi-line tunnels, the disturbance caused is more complex compared to double-line tunnels,” MA explains. This complexity necessitates a focused approach to risk identification and management, particularly in areas where existing tunnels are vulnerable.
The study utilizes a rail transit interval line and depot station as a case study, employing structural reliability criteria to pinpoint areas most affected by construction activities. By establishing a refined three-dimensional numerical model, the research team analyzed land subsidence and the deformation of existing tunnels at various stages of the excavation process. The findings reveal that existing tunnels with minimal clearance experience significant displacement during the construction of adjacent shield tunnels.
“The disturbance impact decreases significantly as the distance from the preceding tunnel increases,” states MA, highlighting the importance of strategic planning in tunnel construction. The research emphasizes the need for in-tunnel reinforcement measures, such as cross braces and arch canopies, which have proven effective in mitigating additional stress and deformation on existing structures.
The implications of this research extend beyond the immediate safety concerns. By enhancing the structural reliability of tunnels, construction companies can reduce the risk of costly repairs and project delays, ultimately leading to more efficient and profitable operations. As urban areas continue to grow, the insights gained from this study are likely to inform best practices in tunneling and infrastructure development.
Published in ‘Chengshi guidao jiaotong yanjiu’ (Urban Traffic Research), this study serves as a critical resource for engineers and project managers who are navigating the complexities of multi-line tunnel construction. For further details, you can visit China Railway First Survey and Design Institute Group Co., Ltd..
As the construction sector looks towards the future, the findings of this research may very well shape the standards and practices that govern multi-line tunnel construction, ensuring safer and more efficient urban transit solutions.
