Piston Core Properties and Disturbance Effects
Publication: Journal of Geotechnical Engineering
Volume 112, Issue 6
Abstract
Laboratory geotechnical data on piston cores from 31 sites on the mid‐Atlantic Upper Continental Slope show the near‐surface sediments vary from normally consolidated to somewhat overconsolidated clayey silts and silty clays of low to high plasticity. They also exhibit normalized behavior and their index property correlations with the effective‐stress friction angle, the undrained strength ratio, and the compression index are reasonably consistent with existing knowledge. Disturbance effects were effectively minimized in the consolidation and strength parameter determinations by using stresses and stress histories in excess of those in situ. However, substantial disturbance effects in preconsolidation stress determinations were found. The preconsolidation stress values derived from the triaxial data are high, and those from the consolidation data are low, compared with the values obtained from the laboratory vane data. Because existing knowledge concerning disturbance effects suggests that in‐situ preconsolidation stress values should lie between those derived from the triaxial and laboratory vane data, the preconsolidation stress values obtained from the consolidation data appear to be appreciably smaller than in‐situ values.
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References
1.
Atkinson, J. H., and Bransby, P. L., The Mechanics of Soils: Introduction to Critical State Soil Mechanics, McGraw‐Hill Book Co., Inc., London, England, 1978.
2.
Bishop, A., and Henkel, D. J., The Measurement of Soil Properties in the Triaxial Test, Edward Arnold, London, England, 1962.
3.
Bjerrum, L., “Embankments on Soft Ground,” Proceedings, Specialty Conference on Performance of Earth and Earth‐supported Structures, ASCE, Vol. 2, June 11–14, 1972, pp. 1–54.
4.
Cardinell, A. P., Keer, F. R., and Good, L. K., “Hazard Analysis on the Mid‐Atlantic Continental Slope, OCS Lease Sale 59 Area,” Proceedings, 14th Annual Offshore Technology Conference, Paper OTC 4173, Vol. 1, 1982, pp. 89–104.
5.
Casagrande, A., “The Determination of the Preconsolidation Load and Its Practical Significance,” Proceedings, 1st International Conference on Soil Mechanics and Foundation Engineering, Cambridge, Mass., 1936, pp. 60–64.
6.
Gardner, W. S., “Soil Property Characteristics in Geotechnical Engineering Practice,” Environmental Bulletin, Woodward‐Clyde Consultants, San Francisco, Calif., Vol. 10, No. 2, 1977.
7.
Hatheway, J. C., et al., “U.S. Geological Survey Core Drilling in the Continental Shelf,” Science, Vol. 206, No. 4418, 1979, pp. 515–527.
8.
Herrmann, H. G., “Settlement Characteristics of Sea‐Floor Sediments Subjected to Vertical Loads,” Deep Sea Sediments, Physical and Mechanical Properties, A. L. Inderbitzen, Ed., Plenum Press, New York, N.Y., 1974, pp. 187–208.
9.
Keller, G. H., Lambert, D. N., and Bennett, R. H., “Geotechnical Properties of Continental Slope Deposits—Cape Hatteras to Hydrographer Canyon,” Geology of Continental Slopes, L. J. Doyle, and O. H. Pilkey, Eds., Soc. Econ. Paleontologists and Mineralogists Special Publication, Vol. 27, 1979, pp. 131–151.
10.
Kenney, T. C., Discussion of “Geotechnical Properties of Glacial Lake Clays,” by T. H. Wu, Journal of the Soil Mechanics and Foundations Division, ASCE, Vol. 85, No. SM3, Part 1, 1959, pp. 67–79.
11.
Ladd, C. C., and Foott, R., “New Design Procedure for Stability of Soft Clays,” Journal of the Geotechnical Engineering Division, ASCE, Vol. 100, No. GT7, 1974, pp. 763–786.
12.
Ladd, C. C., et al., “Stress Deformation and Strength Characteristics,” Proceedings, Ninth International Conference on Soil Mechanics and Foundation Engineering, Tokyo, Japan, Vol. 2, 1977, p. 440.
13.
Ladd, C. C., and Lambe, T. W., “The Strength of Undisturbed Clay Determined from Undrained Tests,” Laboratory Shear Testing of Soil, ASTM Special Technical Publication No. 361, 1963, pp. 342–371.
14.
Lambe, T. W., and Whitman, R. V., Soil Mechanics, John Wiley and Sons, Inc., New York, N.Y., 1969.
15.
Larsson, R., “Undrained Shear Strength in Stability Calculation of Embankments and Foundations on Soft Clays,” Canadian Geotechnical Journal, Vol. 17, 1980, pp. 591–602.
16.
Lee, H. J., and Clausner, J. E., “Seafloor Soil Sampling and Geotechnical Parameter Determination Handbook,” Technical Report R‐873, Civil Engineering Laboratory, Naval Construction Battalion Center, Port Hueneme, Calif., 1979.
17.
Mayne, P. W., “Cam‐Clay Predictions of Undrained Strength,” Journal of the Geotechnical Engineering Division, ASCE, Vol. 106, No. GT11, 1980, pp. 1219–1242.
18.
Mayne, P. W., “Stress Anisotropy Effects on Clay Strength,” Journal of the Geotechnical Engineering Division, ASCE, Vol. 111, No. GT3, 1985, pp. 356–366.
19.
Mayne, P. W., Combined discussion of “Stability Analysis with the Simple and Advanced Method for a Failed Dyke,” and “Three Case Studies for Short Term Stability of Soft Clay Deposits,” Soils and Foundations, Vol. 24, No. 2, 1984, pp. 133–134.
20.
McGregor, B. A., “Variations in Bottom Processes Along the U.S. Atlantic Continental Margin,” Geological and Geophysical Investigations of Continental Margins, J. S. Watkins, L. Montadert, and P. W. Dickerson, Eds., American Association Petroleum Geologists Memoir, Vol. 29, 1979, pp. 139–149.
21.
McGregor, B. A., “Morphologic Setting for Core Sites in the Baltimore Canyon Trough,” U.S. Geological Survey Open‐File Report 82‐710, 1982.
22.
McGregor, B. A., et al., “Wilmington Submarine Canyon Area: A Marine Fluvial‐like System,” Geology, Vol. 10, 1982, pp. 27–30.
23.
Mesri, Gholamreza, Discussion of “New Design Procedure for Stability of Soft Clays,” by Charles C. Ladd and Roger Foott, Journal of the Geotechnical Engineering Division, ASCE, Vol. 101, No. GT4, 1975, pp. 409–412.
24.
Miller, R. E., et al., “Residual Interstitial Gas Studies of Piston Cored Sediments from North and Mid‐Atlantic OCS Environments,” U.S. Bureau of Land Management Open‐File Report MOUAA‐551‐MU9‐4, 1981, pp. 1–17.
25.
Milliman, J. D., Pilkey, O. H., and Ross, D. A., “Sediments of the Continental Margin off the Eastern U.S.,” Geological Society of America Bulletin, Vol. 83, 1972, pp. 1315–1334.
26.
Olsen, H. W., et al., “Geotechnical Test Results on Piston Core Samples Taken from the Mid‐Atlantic Upper Continental Slope by the U.S. Geological Survey During September 1979,” U.S. Geological Survey Open‐File Report 81‐366, 1981.
27.
Olsen, H. W., et al., “Stability of Near Surface Sediment on the Mid‐Atlantic Upper Continental Slope,” Proceedings, 14th Annual Offshore Technology Conference, Paper OTC 4303, Vol. 3, 1982, pp. 21–36.
28.
Olsen, H. W., and Rice, T. L., “Geotechnical Profiles for Thirty‐One Sites on the Mid‐Atlantic Upper Continental Slope,” U.S. Geological Survey Open‐File Report 82‐841, 1982.
29.
Parry, R. G. H., and Wroth, C. P., “Pore Pressure in Soft Ground,” University of Cambridge Report No. S‐75‐3 to the U.S. Army Waterways Experiment Station, Vicksburg, Miss., 1976.
30.
Robb, J. M., Hampson, J. C., Jr., and Kirby, J. R., “Surficial Geologic Studies of the Continental Slope in the Northern Baltimore Canyon Trough Area—Techniques and Findings,” Proceedings, 14th Annual Offshore Technology Conference, Paper OTC 4170, Vol. 1, 1982, pp. 39–59.
31.
Robb, J. M., et al., “Geology and Potential Hazards of the Continental Slope Between Linkenhohl and South Toms Canyons, Offshore Mid‐Atlantic United States,” U.S. Geological Survey Open‐File Report 81‐600, 1981, 33 pp.
32.
Schmertmann, J. H., “The Undisturbed Behavior of Saturated Clays,” Transactions, ASCE, Vol. 120, 1955, pp. 1201–1233.
33.
Schofield, A. N., and Wroth, C. P., Critical State Soil Mechanics, McGraw Hill Book Co., Inc., London, England, 1968.
34.
Seed, H. B., Noorany, I., and Smith, I. M., “Effects of Sampling and Disturbance on the Strength of Soft Clays,” Institute of Engineering Research Report No. TE‐64‐1, Univ. of California, Berkeley, Calif., Feb., 1964.
35.
Skempton, A. W., “Discussion on the Planning and Design of the New Hong Kong Airport,” Civil Engineering Institute Proceedings, Vol. 7, 1957, p. 306.
36.
Terzaghi, K., and Peck, R. B., Soil Mechanics in Engineering Practice, John Wiley and Sons, Inc., New York, N.Y., 1948.
37.
Twichell, D. C., Roberts, D. G., and Takki, P. G., “Long Range Sidescan Sonar Views of the U.S. Continental Slope and Rise Between the Hudson and Baltimore Canyons,” Geological Society of America Abstracts with Programs, Vol. 12, No. 7, 1980, pp. 538–539.
38.
Wroth, C. P., “The Interpretation of In‐Situ Soil Tests,” Geotechnique, Vol. 34, No. 4, 1984, pp. 449–489.
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Copyright © 1986 ASCE.
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Published online: Jun 1, 1986
Published in print: Jun 1986
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