Geotechnical properties of siliceous sediments from the Central Indian Basin
IR@NIO: CSIR-National Institute Of Oceanography, Goa
View Archive Info| Field | Value | |
| Creator |
Khadge, N.H.
|
|
| Date |
2006-08-28T08:53:47Z
2006-08-28T08:53:47Z 2002 |
|
| Identifier |
Current Science, vol.82(3), 338-343p.
http://drs.nio.org/drs/handle/2264/280 |
|
| Description |
Indian Deep-Sea Environment Experiment (INDEX) was carried out in a pre-selected area with low nodule abundance and uniform sediment type, for the purpose of environmental impact assessment of future deep-sea mining activities. Geotechnical testing of sediments was part of this multidisciplinary programme and was carried out on siliceous sediments from the Central Indian Basin. Sediments showed change in undrained shear strength and natural water content due to a simulated disturbance experiment conducted in the area. An increase in water content and significant decrease in the shear strength was observed in sediment layer of 0-5 cm from the disturbance area, but no significant changes were noted outside the area of disturbance. High values of porosity and water content were due to presence of 10-20% radiolarian tests and water-absorbing montmorillonite. The prominent loss of undrained shear strength of the sediments exposed to physical disturbance would affect the bearing capacity of the sediment and thus restrict the movement of the nodule collector. Other index properties such as wet bulk density, porosity and specific gravity inside and outside the disturbed zone remained unchanged, mainly due to similar grain size and dominant clay mineralogy.
|
|
| Format |
176128 bytes
application/pdf |
|
| Language |
en
|
|
| Publisher |
Indian Academy of Sciences
|
|
| Subject |
Central Indian Basin
Indian Ocean |
|
| Title |
Geotechnical properties of siliceous sediments from the Central Indian Basin
|
|
| Type |
Article
|
|