World’s First 350 km/h Single-Tube Double-Track High-Speed Rail Undersea Tunnel Completed。 скачать в хорошем качестве

World’s First 350 km/h Single-Tube Double-Track High-Speed Rail Undersea Tunnel Completed。

World’s First 350 km/h Single-Tube Double-Track High-Speed Rail Undersea Tunnel Completed。How Can It Handle 17 Fault Zones? Why Is Its Seismic Technology Leading Globally? Have you ever imagined a future where taking a high-speed train through an undersea tunnel is part of your daily commute? Well, that dream is becoming a reality. On March 26, 2025, the world’s first 350 km/h single-tube double-track high-speed rail undersea tunnel—the Shantou Undersea Tunnel—was officially completed. This marks another significant breakthrough in China's high-speed rail technology. The project not only introduced innovative shock-absorbing technologies but also successfully tackled complex underwater geological conditions, breaking multiple international records. In this video, we’ll dive deep into the story and technological highlights behind this remarkable engineering feat. The Shantou Undersea Tunnel is located in eastern coastal China, spanning approximately 9,781 meters with a design speed of 350 km/h. It is the world’s first single-tube double-track high-speed rail undersea tunnel. Connecting two major cities—Shantou and Xiamen—the tunnel significantly reduces travel time between these locations and injects new vitality into regional economic development. According to plans, this tunnel will cut travel time from 4 hours (via ferry or land routes) to less than 1 hour, greatly enhancing travel efficiency. Underwater geological conditions are notoriously challenging, especially with the presence of 17 fault zones. These fault zones pose significant challenges for tunnel construction, making traditional methods inadequate. Advanced technologies and equipment were necessary to ensure the safety and reliability of the project. These fault zones not only increase construction difficulty but also threaten the long-term stability and safety of the tunnel. To overcome these issues, engineers employed a series of innovative techniques, such as spring-type joints and flexible seismic isolation layers. A spring-type joint is a novel shock-absorbing device designed to effectively absorb seismic wave energy and reduce structural impact on the tunnel. Similar to shock absorbers in car suspensions, it uses elastic elements to cushion vibrations. In the Shantou Undersea Tunnel, spring-type joints were extensively used, significantly improving the tunnel's seismic performance. During a simulation experiment, researchers found that when the tunnel was subjected to strong seismic waves, the spring-type joints could disperse vibration energy in multiple directions, preventing concentrated stress from causing structural damage. Data showed that after using spring-type joints, the tunnel's seismic resistance improved by over 30%. Imagine if tunnels had their own "shock absorption system," much like cars do. The spring-type joint is precisely that—a magical component that keeps the tunnel steady even during earthquakes. A flexible seismic isolation layer is made from special materials with excellent flexibility and compressive strength. It can quickly adjust its shape during earthquakes, forming a protective barrier to prevent damage to the internal structure of the tunnel. Compared to traditional seismic isolation techniques, flexible isolation layers offer higher adaptability and durability. In actual tests, researchers found that these layers could automatically adjust their shape under strong vibrations, creating an effective buffer zone, thereby reducing the impact on the tunnel's main structure. Data indicated that the use of flexible isolation layers reduced structural damage inside the tunnel by over 40%. Essentially, it’s like giving the tunnel a protective coat, ensuring it remains intact even in hazardous situations.