Research on skid resistance performance of long downhill tunnels in mountainous expressways

In order to improve the operational efficiency of long downhill tunnels on mountainous expressways and ensure the safety of driving, this article takes the Taipingliang Tunnel on the Zhangshi Expressway in Hebei Province as a basis, and uses the method of laying different test sections to analyze the factors affecting the anti-skid performance of the road surface of the long downhill tunnel. Long term post observation is conducted, and continuous observation data is compared and analyzed to compare the effects of different materials and particle sizes on the use effect and service life of the tunnel pavement overlay, providing reference for similar projects.