In modern infrastructure construction, tunnels are not only crucial for connecting locations separated by mountains, rivers, or densely populated urban areas, but also crucial for regional economic development and transportation efficiency. As a core component of tunnel structures, the construction cost of tunnel linings has always been a key concern for project decision-makers and engineering designers. Accurately understanding the cost structure of tunnel linings per meter helps optimize budgets, optimize design solutions, and improve overall project efficiency.
What is tunnel lining? Why is it so critical?
Tunnel lining refers to the structural layer constructed within the tunnel after excavation. Its main functions include:
Supporting surrounding rock: Resisting ground pressure, preventing collapse or deformation, and ensuring tunnel safety and stability.
Waterproofing and drainage: Preventing groundwater infiltration and draining it through drainage systems, protecting the tunnel structure and operational environment.
Aesthetics and functionality: Providing a smooth interior wall facilitates the installation of lighting, вентиляция, pipelines, and other facilities, while also enhancing the tunnel’s aesthetics.
таким образом, lining quality directly impacts the tunnel’s service life, безопасность, and operational functionality.
Major Factors Influencing the Construction Cost Per Meter of Tunnel Lining
Tunnel lining costs are not fixed; they are influenced by a variety of factors. The following factors are key factors in determining cost:
1. Geological Conditions
Surrounding Rock Grade: Weak or broken surrounding rock requires thicker lining, or even a combination of primary support and secondary lining, which is more expensive. Strong, stable surrounding rock allows for simpler construction and lower costs.
Groundwater Conditions: Areas with abundant groundwater require waterstops, grouting, and drainage systems, which incur additional costs.
Special Geology: Encountering faults, expansive soils, or gas-laden areas requires additional exploration and treatment, complicating lining design and significantly increasing costs.
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