Dynamic response of CFG pile composite subgrade induced by moving train loadings

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (24) : 135-143.

GAO Guanyun1,2，LI Shaoyi1,2

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Abstract

The train-track-subgrade numerical model is established including the upper train-track model and the under subgrade FE model to analyze the ground vibration of the CFG pile composite subgrade. The train is simulated by the multiple mass-spring-damper model. The track is modeled by Euler beam with consideration of random rail irregularities. The train-track model is solved by the modal analysis method. The railway subgrade is discretized and solved by 2.5D FEM with a viscous damping absorbing boundary to reduce the reflection wave. The CFG pile is modeled by pile wall with modified elastic modulus. The influences of the CFG pile composite subgrade on ground vibration attenuation and vibration frequency spectrum are discussed. The results show that The influence of CFG pile composite subgrade on the ground vibration is comprised of the influence of CFG pile and the influence of cushion. The CFG pile has the waveguide effect on the high frequency vibration and reduces the high frequency vibration from the embankment; the cushion of the composite subgrade affects the ground vibration by reducing the low and medium frequency vibration. Besides the composite subgrade reduces the high frequency vibration at the edge of embankment, that improves the dynamic stability of the slope of embankment.

Key words

ground vibration / CFG pile composite subgrade / spectral analysis / 2.5D FEM / waveguide effect

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GAO Guanyun1,2，LI Shaoyi1,2 . Dynamic response of CFG pile composite subgrade induced by moving train loadings[J]. Journal of Vibration and Shock, 2015, 34(24): 135-143

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