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Geotechnical properties of surface sediments in the INDEX area

DRS at CSIR-National Institute of Oceanography

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Title Geotechnical properties of surface sediments in the INDEX area
 
Creator Khadge, N.H.
 
Subject sediments
sediment properties
geotechnology
shear strength
siliceous sediments
baseline studies
environmental impact
environment management
benthos
 
Description As a part of the environmental impact assessment studies, geotechnical properties of sediments were determined in the Central Indian Basin. The undrained shear strength and index properties of the siliceous sediments were determined on 20 box cores of uniform dimension collected from various locations in five preselected sites. The maximum core length encountered was 41 cm and most of the sediments were siliceous oozes consisting of radiolarian or diatomaceous tests. The shear strength measurements revealed that surface sediments deposited in recent times (0-10 cm) have a shear strength of 0-1 kPa; this value increases with depth, reaching 10 kPa at 40 cm deep. Older sediments have greater strength because of compaction. Water content varies in the wide range of 312-577% and decreases with depth. The clay minerals such as smectite and illite are dominant and show some control over water content. Wet density, specific gravity, and porosity do not indicate any notable variation with depth, thereby indicating a uniform, slow rate of sedimentation. The average porosity of sediments is 90.2%, specific gravity 2.18, and wet bulk density 1.12 g/cm sup(3). Sediments exhibit medium to high plasticity characteristics, with the average plasticity index varying beteen 105% and 136%. Preliminary studies on postdisturbance samples showed an increase in natural water content and a decrease in undrained shear strength of sediments in the top 10- to 15-cm layer
 
Date 2009-01-09T08:08:14Z
2009-01-09T08:08:14Z
2000
 
Type Journal Article
 
Identifier Marine Georesources and Geotechnology, Vol.18; 251-258p.
http://drs.nio.org/drs/handle/2264/1658
 
Language en
 
Rights Copyright [2000]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Taylor and Francis