Deformation mechanism of embedded steel cylinder breakwaters with backfill sand foundation under seismic action
FENG Guojun1,2,SONG Bo1,2,WANG Rong2,3
1.School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;
2.Beijing International Cooperation Base for Science and Technology-Aseismic Research of the Rail Transit Engineering in the Strong Motion Area,Beijing 100083,China;
3.China Harbour Engineering Company Ltd.,Beijing 100027,China
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.
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