Deformation mechanism of embedded steel cylinder breakwaters with backfill sand foundation under seismic action

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (2) : 59-66.

FENG Guojun1,2,SONG Bo1,2,WANG Rong2,3

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Abstract

The dynamic responses of embedded steel cylinder breakwaters with backfill sand foundation were studied by shaking table tests and numerical simulations in order to comprehend its deformation mechanism.The results show that the slip phenomenon of the backfill sand outside cylinder becomes obvious under seismic waves of the peak ground acceleration 3.2 m/s2 in shaking table tests,and the tested breakwater model tilts by reason of the lateral force change due to liquefaction,so it is advised that the backfill sand outside cylinder should be improved in priority.The design limit of the seismic performances of breakwaters was analyzed by numerical simulations.When the design ground motion is 3.2 m/s2,the steel cylinder is still in an elastic stage on account of its high yield strength and the damage degree is mainly determined by the residual horizontal displacement.The effects of the stresses in the wall of steel cylinder were studied by numerical simulations,and the weak points were found out,which can provide reference to practical engineering designs.

Key words

breakwater / steel cylinder / deformation mechanism / embedded / seismic

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FENG Guojun1,2,SONG Bo1,2,WANG Rong2,3. Deformation mechanism of embedded steel cylinder breakwaters with backfill sand foundation under seismic action[J]. Journal of Vibration and Shock, 2019, 38(2): 59-66

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