Analysis of ground vibrations induced by high-speed train moving on pile-supported subgrade using three-dimensional FEM
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Analysis of ground vibrations induced by high-speed train moving on pile-supported subgrade using three-dimensional FEM GAO Guang-yun(高广运)1, 2, BI Jun-wei(毕俊伟)1, 2, CHEN Qing-sheng(陈青生)2, 3, CHEN Run-min(陈润民)1, 2 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: The pile-supported subgrade has been widely used in high-speed railway construction in China. To investigate the ground vibrations of such composite foundation subjected to moving loads induced by high-speed trains (HSTs), three-dimensional (3D) finite element method (FEM) models involving the pile, pile cap and cushion are established. Validation of the proposed model is conducted through comparison of model predictions with the field measurements. On this basis, ground vibrations generated by HSTs under different train speeds as well as the ground vibration attenuation with the distance away from the track centerline are investigated. In addition, the effects of piles and pile elastic modulus on ground vibrations are well studied. Results show that the pile-reinforcement of the subgrade could significantly contribute to the reduction of ground vibrations. In particular, the increase of elastic modulus of pile could lead to consistent reduction of ground vibrations. However, when the pile elastic modulus is beyond 10 GPa, this benefit of pile-reinforcement on vibration isolation can hardly be increased further. Key words: high-speed railway; ground vibrations; 3D FEM; pile-supported subgrade; pile elastic modulus Cite this article as: GAO Guang-yun, BI Jun-wei, CHEN Qing-sheng, CHEN Run-min. Analysis of ground vibrations induced by high-speed train moving on pile-supported subgrade using three-dimensional FEM [J]. Journal of Central South University, 2020, 27(8): 2455−2464. DOI: https://doi.org/10.1007/s11771-020-4461-4.
1 Introduction The high-speed railway has been rapidly developed over the past decade all over the world for its conveniences and efficiencies. High-speed trains (HSTs) can generate the ground vibrations that travel large distance from the track center, causing discomfort to residents and misalignment of sensitive instruments, which has for years been seen as one of the major environmental problems [1,
2]. Therefore, with the rapid uptake of the highspeed railway, ground vibrations induced by HSTs have increasingly received great concerns. Over recent two decades, various models have been developed to predict the ground vibrations generated by railways, have been applied to investigating the generation and propagation of such surface motions [1, 2]. WANG et al [3] presented a two-dimensional (2D) finite element method (FEM) model to study the vibration respons
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