Accession Number : AD0777052

Title :   Short-Term Engineering Behavior of a Deep-Sea Calcareous Sediment.

Descriptive Note : Technical note,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Valent,P. J.

Report Date : MAR 1974

Pagination or Media Count : 38

Abstract : The engineering index parameters, primary consolidation properties, and effective-stress strength properties of a deep-sea calcareous sediment are reported. This short-term engineering property description of the sediment is the first stage of an in-depth study of creep behavior of this sediment during consolidation and shear. The calcareous sediment sample has been classified as an inorganic silt, according to the Unified Soil Classification System. The compression index C(c), is 0.80; empirical correlations from terrestrial engineering between C(c) and other, easily and rapidly-measured index parameters may be in error by 30%. The effective angle of internal friction, phi, of the sediment, when normally consolidated, is 0.65 radians (37 degrees). No significant crushing of the hollow Foraminifera tests (shells) comprising the coarse-size fraction of the sediment was noted in the consolidation tests up to stresses of 1530 kPa (32,000 psf). It was demonstrated, however, that this coarse-size fraction does undergo significant crushing if the material finer than 0.043 millimeter is removed, suggesting that the fine-size fraction acts to distribute load on the coarse-size, test (shell) surfaces. (Author)

Descriptors :   *Ocean bottom soils, *Sediments, *Soil mechanics, Foraminifera, Calcium compounds, Carbonates, Grain size, Creep, Stresses, Compressive properties

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE