Dynamic Performance Assessment of MSE Walls under High-Speed Train Loads

Mechanically stabilized earth (MSE) retaining walls have been successfully implemented in numerous applications, particularly where dynamic loads such as earthquake and traffic loading are prevalent. However, using MSE walls as foundations for high-speed train track systems remains uncertain, and their performance under high-speed train loading is inconclusive. This paper extensively investigates the behavior of MSE walls under various high-speed train loading conditions, addressing key considerations, challenges, and findings. The study focuses on evaluating wall performance in terms of horizontal displacement, settlement behind the facing, tensile load and displacement of reinforcement elements, and wall amplification characteristics. The performance of the wall is also assessed by examining the influence of the cement asphalt mortar layer. The total axle load and loading duration are identified as critical design parameters for high-speed train loading, and an empirical equation is developed to estimate horizontal wall displacement based on these parameters.