Analysis of ground vibration generated by train moving loads on saturated soil

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (6) : 86-92.

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Analysis of ground vibration generated by train moving loads on saturated soil

GAO Guang-yun1, 2; Li Ning1, 2;HE jun-feng3;GAO Meng4

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Abstract

Based on Biot’s wave propagation equations and boundary conditions, the Galerkin method is used to derive the u-w format finite element equation in the frequency domain by Fourier transform. The track and the attached sleepers are simplified as Euler beams resting on saturated half-space, the wave-number transform in the load moving direction is applied to reduce the three-dimensional (3D) dynamic problem to a two-dimensional (2D) problem. The displacement in frequency-wave number domain is obtained by solving the equations, and the 3D time-space domain displacement of the track and the ground is obtained from the fast Fournier transform. The model of 2.5D FEM is verified by calculation example. The paper has presented a track-ground interaction model. The dynamic response is given to evaluate the ground vibration induced by a moving train on the saturated ground. The effect of the soil parameters (such as permeability coefficient, porosity, soil skeleton density and shear wave velocity) on the attenuation of ground vibration are investigated in detail. The results show that acceleration amplitude and frequency decay quickly with the distance increasing from the track. It is also found that the permeability coefficient of soil, porosity, and shear wave velocity and soil skeleton density have great influence on the ground vibrations

Key words

train-track-ground model / saturated soil / u-w format 2.5D finite element / Galerkin method / ground vibration

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GAO Guang-yun;;Li Ning;;HE jun-feng;GAO Meng . Analysis of ground vibration generated by train moving loads on saturated soil[J]. Journal of Vibration and Shock, 2011, 30(6): 86-92