Impact of cement–soil pile driven in railway subgrade horizontally on ground vibration

This paper set up a test section of Shuohuang heavy-haul railway in China to investigate the influence of cement–soil pile reinforcement subgrade on surroundings vibration. The X -, Y -, and Z -direction accelerations of the surrounding environment for the reinforced section and unreinforced section were collected. The study found that in the near-field area, the accelerations of the reinforced subgrade section were smaller than those of the unreinforced section. In addition, the vibration response caused by heavy-haul trains running in parallel after meeting was significantly higher. As the subgrade was reinforced with cement–soil piles, the overall stiffness increased, which had the blocking effect on the high-frequency acceleration of the near-field region. Besides reinforced cement–soil piles have the effect on the peak dominant frequencies of vibration accelerations in near-field area, resulting in a decrease in the peak dominant frequency. The cement–soil piles not only could inhibit the settlement deformation of the subgrade but also had a certain blocking effect on the vibration of the near-field region.