Abstract
A dynamic model test (CL = 4) at different velocities of train, namely different loading frequencies, is carried out to study the dynamic characteristics of a high-speed railway tunnel invert and its foundation soils. Not only are the accelerations, dynamic coefficients, dynamic stresses of the invert and foundation soils emphatically analyzed, their relationship with the velocity of the train are discussed in detail. Through laboratory testing, the attenuation of vibration propagating from up the rails is obtained and the calculation formula of the speed influence coefficient of the tunnel invert is preliminarily established. The depth of the foundation soils influenced by vibration is also determined in this study. It is shown that the responses of the tunnel invert and foundation soils to vibration are slightly increased with the velocity of the train; circumferential stresses in the bottom of the invert are tensile stresses and maximum stresses appear under the foot of the rails; the dynamic soil pressures of the foundation decrease quickly with the distance away from the tunnel invert and an exponential relationship exists between them.
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Supported by: the National Program on Key Basic Research Project of China (973 Program) under Grant No. 2011CB013802, and the National Basic Research Program of China under Grant No. 51108461 and No. 51308270
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Huang, J., Yuan, T., Peng, L. et al. Model test on dynamic characteristics of invert and foundation soils of high-speed railway tunnel. Earthq. Eng. Eng. Vib. 14, 549–559 (2015). https://doi.org/10.1007/s11803-015-0044-z
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DOI: https://doi.org/10.1007/s11803-015-0044-z