In-Place Ocean Soil Strength by Accelerometer

by Ronald F. Scott, (M.ASCE), Prof. of Civ. Engrg.; Div. of Engrg. and Appl. Sci., California Inst. of Technol., Pasadena, CA,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1970, Vol. 96, Issue 1, Pg. 199-211

Document Type: Journal Paper


The in-place measurement of the shearing strength of ocean-floor soils, although desirable, is difficult because of the problems involved in all work at sea. A single-axis, self-contained recording accelerometer was designed for attachment to conventional core-barrel samplers, which are usually released a few feet above the ocean floor, and fall freely to penetrate the sea-bed soil. Successive integrations of the acceleration record produced by the impact provide the time-history of velocity and displacement of the corer. These results, together with the known mass of the corer, enable the shearing resistance of the soil to be calculated as a function of depth below the soil surface. The paper describes the accelerometer and its operation, and illustrates the calculations with reference to typical records obtained at sea.

Subject Headings: Ocean engineering | Soil strength | Sea floor | Shear resistance | Shear strength | Floors | Penetration tests | Displacement (mechanics)

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