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| Study on vibration characteristics of a new prestressed subgrade under train loads |
| DONG Junli1，LENG Wuming1，2，XU Fang1，2，ZHANG Qishu1，3，LI Zhong1，4，RUAN Bo1，4，YAO Kang1 |
(1. School of Civil Engineering，Central South University，Changsha，Hunan 410075，China；2. MOE Key Laboratory of Engineering Structures of Heavy Haul Railway，Central South University，Changsha，Hunan 410075，China；3. School of
Civil Engineering，Center South University of Forestry and Technology，Changsha，Hunan 410004，China；
4. Hunan Tieyuan Civil Engineering Testing Co.，Ltd.，Changsha，Hunan 410004，China) |
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Abstract Studying the operation performance and reinforcement mechanism of prestressed subgrades under train loads can provide technical references for engineering design. In this study，a 1∶5 scale model test was performed to explore the effect of the train axle load and the prestress on the acceleration response of the subgrade，and a three-dimensional dynamic finite element model of the prestressed subgrade was then established to analyze the distribution characteristics of the acceleration field and the prestress reinforcement mechanism. The results show that：(1) Under the action of the cyclic train loading，the peak and trough of the vertical acceleration of the subgrade fluctuate in a small range，and their mean value can be used to reflect the long-term vibration degree of the subgrade. (2) At the shoulder of the subgrade，the peak vertical acceleration linearly increases with increasing the train axle load and exponentially decreases with increasing the prestress，and an empirical model is then established to describe the relationship among the peak acceleration，the train axle load and the prestress. (3) The peak vertical acceleration exhibites a highly correlation with the prestress level，and the acceleration significantly attenuates while propagating along the transverse and depth directions of the subgrade. Therefore，the zones around the lateral pressure plate is significantly affected by the prestress comparing with the inner zones of the subgrade. (4) The horizontal prestress could alleviate the vertical vibration of the subgrade，and the core zones of the subgrade can be effectively enhanced by adjusting the prestress level and increasing the subgrade slope rate. The research findings can provide references for further understanding the reinforcement mechanism of the prestressed subgrade.
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2023, Vol. 42 
