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Screening effects of open trenches to ground vibrations induced by highspeed trains on a poroelastic halinspace

Anders Boström (Institutionen för tillämpad mekanik, Dynamik) ; Zhigang Cao (Institutionen för tillämpad mekanik, Dynamik) ; H. Sun
5th International Symposium on Environmental Vibration, ISEV 2011; Chengdu; China; 20 October 2011 through 22 October 2011 p. 777-783. (2011)
[Konferensbidrag, refereegranskat]

An analytical model is proposed to investigate the screening effects of trenches to the train-induced ground vibrations in three-dimensional conditions. A fully saturated poroelastic half-space is firstly utilized to model the ground. Placed on the top of the poroelastic half-space, the embankment and soil banks beside the trenches are modelled as elastic layers with appropriate widths. The rails and sleepers are modelled as Euler beams and an anisotropic Kirchhoff plate, respectively. Biot's theory is applied to characterize the fully saturated poroelastic half-space, considering the coupling between the soil skeleton and the fluid. The governing equations are solved in the transformed domain based on Fourier transforms and Fourier series;the time domain results can be obtained by the fast Fourier transform(FFT). Numerical examples are given for a moving x2000 train that operates on the saturated poroelastic half-space. The influences of coupling effect between soil skeleton and pore water on the screening efficiency of the trench are investigated. Furthermore, the screening effects of open trenches on the poroelastic half-space are compared with that of trenches on the single-phase elastic half-space. It is found that the single-phase elastic half-space model will underestimate the screening effect of the trench significantly for supercritical train speeds.

Nyckelord: Analytical solution; Ground vibration; High-speed train; Trenches



Denna post skapades 2014-11-24. Senast ändrad 2016-10-18.
CPL Pubid: 206462

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Dynamik

Ämnesområden

Teknisk mekanik

Chalmers infrastruktur