NDLI: Effect of Relative Density on the Wave-Induced Liquefaction in Seabed Around a Breakwater

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Tomi, Yuichiro Zen, Kouki Chen, Guangqi Kasama, Kiyonobu Yahiro, Yuichi
Copyright Year	2009
Abstract	The liquefaction of seabed induced by ocean waves is considered to be one of the influential phenomena related to damages of coastal marine structures such as the floating of pipelines, the settlement of concrete blocks and the reduction of pile foundation resistance, etc, since the liquefied seabed loses its shear strength and then easily and drastically deforms. A model flume was newly developed to simulate the wave-induced liquefaction in seabed around a breakwater with a reduced model scale against the caisson type breakwater widely used in Japan. The dimension of developed flume was the length of 6.0m, the width of 0.4m and the depth of 0.9m. As for geotechnical parameters affecting the wave-induced liquefaction of seabed around the model breakwater, the effect of seabed density on liquefaction was highlighted in this paper in terms of the generation of pore water pressure in seabed and the settlement of seabed surface. The experiment was carried out under the following conditions; the wave period was 1.0s, the incident wave height was 55mm, the depth of water was 170mm, the thickness of permeable layer was 350mm and the relative density was between 20% and 60%. In order to satisfy similarity law in 1g gravitational field, the polymer fluid was used to decrease the permeability of model seabed. As the result from this study, the following conclusions were obtained; 1) When water was used as a fluid, the liquefaction due to the residual excess pore water pressure happened in the sand bed with the relative density of 23%. However, the liquefaction did not happened in the sand bed with the relative density more than 30%, 2) When the polymer fluid is used for reducing the permeability of model seabed, the generation of pore water pressure ratio becomes larger and the dissipation time of generated pore pressure becomes longer compared with the case using water, 3) When the relative density of seabed was between 20% and 40%, the liquefaction induced by the residual excess pore water pressure was observed in the deep area of model seabed while the shear failure of seabed was observed in the shallow area of model seabed, 4) When the relative density was between 50% and 60%, the liquefaction due to the residual excess pore water pressure was not observed in the present experimental conditions.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
Starting Page	267
Ending Page	273
Page Count	7
File Format	PDF
ISBN	9780791843475
DOI	10.1115/OMAE2009-79601
e-ISBN	9780791838440
Volume Number	Volume 7: Offshore Geotechnics; Petroleum Technology
Conference Proceedings	ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2009-05-31
Publisher Place	Honolulu, Hawaii, USA
Access Restriction	Subscribed
Subject Keyword	Water Pipelines Concrete blocks Density Waves Breakwaters Shorelines Fluids Energy dissipation Marine structures Ocean waves Polymers Damage Pilings (building) Failure Water pressure Liquefaction Shear strength Dimensions Permeability Caissons Seabed Pressure Sands Flumes Shear (mechanics)
Content Type	Text
Resource Type	Article

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