Abstract
With the rapid development of railway construction, many railway projects have crossed the soft soil deposit. In order to obtain ground settlement data after train operation to ensure the safety of railway, the train-track dynamic model and track-ground finite element model were established to predict accumulated deformation of soft soil foundation induced by dynamic train load. Compared to the measured vibration acceleration on the sleeper and ground, the predicted vibration acceleration can match well with the measured vibration acceleration across the full range of time history shown. The results showed that after many times of train operations, the cumulative deformations of the ground at different depth are quite different, it may affect the safety of the railway operation, the foundation reinforcement measures can be considered during construction.
Highlights
With the rapid development of railway construction, many railway projects have crossed the soft soil deposit
In order to obtain ground settlement data after train operation to ensure the safety of railway, the train-track dynamic model and track-ground finite element model were established to predict accumulated deformation of soft soil foundation induced by dynamic train load
In order to analyze the dynamic deformation mechanism caused by moving train loads, this section establishes the of train-track coupling dynamic model, fully considering the influence of track irregularity, and calculating the wheel-rail interaction when the train runs on the track structure in the time domain
Summary
With the rapid development of railway construction, many railway projects have crossed the soft soil deposit. The settlement of the ground surface, especially when it occurs in a rapid and differential manner, may cause severe damage on human-built structures and the loss of human lives. Some scholars studied train induced ground vibration and settlement through measurement, numerical simulation, and empirical equation [1, 2]. Shih et al [3] built a finite element model of the track and ground to study train induced soft ground deflections. Cui et al [5] based on numerical analyses for the actual tunnel excavation to examine the settlements of ground surface. The research on ground deformation monitoring over soft soil deposit has undoubtedly played an important guiding role in railway design
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