The Yinxi High-Speed Railway is a vital component of the Fuyin High-Speed Railway network under China’s National Medium- and Long-Term Railway Network Plan. Spanning Ningxia, Gansu, and Shaanxi provinces, the new Yinchuan-to-Xi’an line stretches 616.81 km, departing from Yinchuan Station on the Baotou-Lanzhou Railway and connecting to Xi’an North Station via key cities like Wuzhong, Qingyang, and Binxian.
Project Overview
– Scope: DK167+858 to DK564+500 (380.038 km main line), including 2.26 km in Shaanxi (subcontracted), 272.23 km in Gansu, and 105.548 km in Ningxia.
– Infrastructure:
– 9 new stations (e.g., Ningxian, Qingyang, Huanxian).
– 165 large/medium bridges (129.018 km) and 20 tunnels (82.629 km), with a bridge-tunnel ratio of 55.7%.
– Full Line: 618 km from Xi’an North to Yinchuan Station, featuring 188 bridges (244.40 km), 34 tunnels (143.85 km), and a 62.97% bridge-tunnel ratio.
Key Application: Geocells in Collapsible Loess Foundation
Collapsible loess, a dominant soil type along the route, poses high risks of subgrade settlement—a common form of infrastructure damage. To address this, geocells are integrated with soil to form a reinforced layer:
– Mechanism: The 3D honeycomb structure of geocells restricts buckling deformation in the subgrade while significantly enhancing load-bearing capacity.
– Advantages:
– Prevents uneven settlement caused by loess collapsibility.
– Provides lateral confinement to soil particles, reducing erosion and improving structural stability.
– Offers a cost-effective alternative to traditional deep foundation treatments, cutting construction time by 20–30%.
Engineering Impact
By combining geocell reinforcement with screw-pile foundation technology, the Yinxi High-Speed Railway ensures safe and stable operations in complex geological conditions. This solution not only meets the stringent requirements of high-speed rail engineering but also sets a benchmark for geotechnical applications in collapsible soil regions nationwide.
