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Stress-Deformation Behavior of Two Carbonate Oozes

  • Iraj Noorany
Part of the Frontiers in Sedimentary Geology book series (SEDIMENTARY)

Summary

The geotechnical properties, including strength and compressibility, of two deep-sea carbonate ooze cores are discussed. The sediment samples were obtained from the vicinity of the Christmas and Fanning Islands in the Pacific. Both sediments consisted of fine sand- to silt-sized carbonate foraminiferal and nannofossil oozes with 88 to 93% calcium carbonate. The samples had high water contents (89 to 127%), exhibited some plasticity, and were very sensitive to disturbance and shaking.

Results of consolidation tests indicate apparent overconsolidation behavior. The resistance to deformation caused by prolonged sustained loads was studied by running long-duration consolidation tests. It was found that significant secondary compression occurred under sustained stress (C α = 0.03 to 0.05), and that the sediment developed resistance against further compression. From this, it is postulated that the in situ compressibilities are likely to be lower than those measured in the laboratory by standard consolidation tests (C c . = 0.67 to 0.91).

Undrained strengths were 11 to 12 kPa, and the samples exhibited sensitivities in the range of 6 to 10. In terms of effective stress, the behavior was typical of slightly overconsolidated deposits, with small c′ values, and φ′ values of 27 and 35°.

Keywords

Triaxial Test Geotechnical Property Undrained Shear Strength Compression Index Consolidation Test 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© Springer-Verlag New York, Inc. 1993

Authors and Affiliations

  • Iraj Noorany

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