SOIL MECHANICS OF SHIP BEACHING

N.E. Outtesen Hansen, B.C. Simonsen, M.J. Sterndorff

Abstract


When a ship hits a soil or gravel slope it will create a large transient pore pressure in the soil which will force the ship bow upwards. At the same time the pore water will cause ruptures in the soil which influences the lifting forces on the ship bow. Methods of analysis are presented for the pore water build up, the soils rupture and the resulting reactions on the ship bow for frictional soils. Soil slopes with low permeability (sand in connection with a scour protection) generates large reactions on an impacting ship with the result that the ship will ride up on the surface of the slope and be brought to a stop by friction . Soil slopes with high permeabilities as pebbles or quarry run generate smaller reactions, and the ship will plow itself into the slope. It will then be stopped by a combination of friction and passive soils pressure. The analytical results are compared with test results made in a hydraulic laboratory and by full scale testing in nature of a ship sailed into a beach. Good agreement was found between the theoretical findings and the test results.

Keywords


soil mechanics; ship beaching

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