25D finite element analysis for vibration characteristics of quasi-saturated transversely isotropic foundation under high-speed railway load

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (15) : 298-308.

GAO Guangyun1,2, GENG Jianlong1,2, ZHANG Qiwei3, ZHANG Lulu1,2, SI Zhipeng4

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Abstract

To analyze the ground vibration due to high-speed train moving on quasi-saturated transversely isotropic foundation, the 2.5-dimensional finite element (2.5D FE) control equations of quasi-saturated transversely isotropic soil were proposed. A 2.5D FE model involving train, track, quasi-saturated transversely isotropic foundation was established. The ground vibration of saturated and quasi-saturated transversely isotropic foundations were compared at different train speeds. The influence of soil parameters on vibration characteristics of quasi-saturated transversely isotropic foundations were analyzed. The results show that the upward and downward ground displacements of the quasi-saturated transversely isotropic foundation are larger than those of the saturated once. The displacement of quasi-saturated foundation is larger than that of saturated foundation at different train speeds, but the excess pore water pressure is much smaller than that of saturated foundation. The higher the train speed, the larger ground vibration displacement of saturated and quasi-saturated foundations but the slower attenuation, the larger excess pore pressure in the two types of foundations and faster the attenuation, the greater displacement difference between the quasi-saturated foundation and the saturated once. The vertical vibration displacement and excess static pore pressure of the quasi-saturated foundation decrease with increasing horizontal elastic modulus and vertical once, increasing with increasing horizontal Poisson's ratio, decreasing with increasing vertical Poisson's ratio, decreasing with increasing shear modulus. The vertical elastic modulus has a greater influence on the vertical vibration displacement than horizontal elastic modulus. Compared with the horizontal Poisson's ratio, the vertical once has a greater influence on the vertical vibration displacement peak and excess static pore pressure.

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high-speed railway / quasi-saturated transversely isotropic foundation / 2.5D FEM / ground vibration / soil parameters?

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GAO Guangyun1,2, GENG Jianlong1,2, ZHANG Qiwei3, ZHANG Lulu1,2, SI Zhipeng4. 25D finite element analysis for vibration characteristics of quasi-saturated transversely isotropic foundation under high-speed railway load[J]. Journal of Vibration and Shock, 2023, 42(15): 298-308

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