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2025
-
04
The function of railway tunnels
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The main functions of railway tunnels include shortening the length of the line, overcoming topographical elevation obstacles, improving the line gradient and operating conditions, protecting the ecological environment, enhancing transportation safety and stability, and replacing bridges to reduce the impact on navigation. The specific functions are as follows:
Shortening the line and improving efficiency
In mountainous or complex terrain, railway tunnels directly pass through mountains or obstacles, avoiding detours, significantly reducing the total railway mileage, thereby improving transportation efficiency and saving energy. For example, when a railway needs to cross a mountain range, a tunnel can avoid the meandering route caused by terrain undulations, allowing trains to pass through a shorter route.
Overcoming elevation obstacles and improving gradients
Due to the limitations of train traction capacity and gradient (usually less than 24%), tunnels ensure the feasibility and safety of train operation by reducing the line gradient. For example, directly crossing a mountain can avoid steep slopes designed due to insufficient climbing capacity.
Protecting the natural environment
Tunnel construction can reduce direct damage to sensitive ecological areas, such as avoiding railway lines cutting through forests or wetlands, reducing interference with animal and plant habitats, and achieving a balance between engineering and environmental protection.
Enhancing safety and stability
The internal environment of the tunnel is relatively closed, which can withstand the impact of bad weather such as rain, snow, and strong winds, ensuring the continuity and safety of train operation. In addition, the tunnel structure can reduce the threat of landslides or rockfalls to the railway.
Replacing bridges to promote navigation
When crossing rivers or straits, underwater tunnels (such as the Channel Tunnel) can replace bridges, avoiding bridge piers obstructing the navigation of large ships and reducing the impact on aquatic ecology.
Promoting regional economic development
Tunnels connect remote areas with main transportation lines, promoting resource circulation and personnel exchanges, and driving the integrated development of regional economies along the line. For example, the tunnel project of the Qinghai-Tibet Railway has significantly improved the transportation conditions in the Tibet region.
Different types of railway tunnels (such as mountain tunnels, underwater tunnels, and urban tunnels) will play a targeted role in specific applications according to geographical needs.
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The function of railway tunnels
The main functions of railway tunnels include shortening the length of the line, overcoming topographical obstacles, improving the line gradient and operating conditions, protecting the ecological environment, and enhancing the safety and stability of transportation.
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