Degradation of Marine Clays under Cyclic Loading
Publication: Journal of Geotechnical Engineering
Volume 114, Issue 2
Abstract
A study of the effect of the overconsolidation ratio (OCR) on the cyclic shear modulus degradation of clay is presented. The research is based on a series of strain‐controlled, constant‐volume, cyclic, simple‐shear tests conducted on samples of an offshore Venezuelan clay consolidated to 2, and 4. The modulus degradation with number of cycles is successfully modeled for different OCR's using an expression applied previously to normally consolidated clays. The rate of cyclic modulus degradation decreases with increased OCR, and the dynamic stress‐strain backbone curves can be modeled by an extension of the SHANSEP method originally suggested for normalizing static stress‐strain curves. A chart is also developed for normally consolidated marine clays from Venezuela, California, and Alaska, which indicates that the modulus degradation rate parameter t, corresponding to a given cyclic strain, is similar for similar clays, with t decreasing as the plasticity of the clay increases. Also, a comparison between values of t obtained from simple shear and triaxial tests on one of the clays shows that these different test types can be compared at an equal value of the increment of deviatoric strain trajectory for one cycle. This suggests a way to apply the modulus degradation model presented in this study to the analysis of 3‐D cyclic loading situations using the incremental theory of plasticity.
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References
1.
Andersen, K. H. (1976). “Behavior of clay subjected to undrained cyclic loading.” Proceedings, International Conference on the Behavior of Off‐Shore Structures '76, Vol. 1, Trondheim, Norway, 392–403.
2.
Andersen, K. H., et al. (1980). “Cyclic and static laboratory tests on Drammen clay.” J. Geotech. Engrg. Div., ASCE, 106(GT5), 499–529.
3.
Bjerrum, L., and Landva, A. (1966). “Direct simple‐shear test on a Norwegian quick clay.” Geotechnique, 16(1), 1–20.
4.
Dobry, R., Dyvik, R., and Sgambatti, J. (1981). Static and cyclic simple shear tests of normally consolidated offshore Orinoco clay, prepared for INTEVEP, Los Teques, Venezuela.
5.
Finn, W. D. L., and Bhatia, S. K. (1980). “Endochronic theory of sand liquefaction.” Proceedings, VII World Conference on Earthquake Engineering, Istanbul, Turkey, Vol. 3, 149–156.
6.
Idriss, I. M., et al. (1976). “Behavior of soft clays under earthquake loading conditions.” Proceedings, 8th Annual Offshore Technology Conference, Houston, Tex., Paper OTC 2671.
7.
Idriss, I. M., Dobry, R., and Singh, R. D. (1978). “Nonlinear behavior of soft clays during cyclic loading.” J. Geotech. Engrg. Div., ASCE, 104(GT12), 1427–1447.
8.
Idriss, I. M., Moriwaki, Y., and Dobry, R. (1977). “Stress‐strain behavior of soft clay in level ground deposits during and after cyclic earthquake loading, normal marine clay, Icy Bay area, Gulf of Alaska,” Final report for Shell Development Company, Woodward‐Clyde Consultants, San Francisco, Calif.
9.
Idriss, I. M., et al. (1980). “Behavior of normally consolidated clay under simulated earthquake and ocean wave loading conditions.” Proceedings, International Symposium on Soils under Cyclic and Transient Loading, 1, Jan., A. A. Balkema, Rotterdam, the Netherlands, 437–445.
10.
Lacasse, S. (1979). “Safety of gravity platforms: effect of time to failure on undrained behaviour of Haga clay—results of static laboratory tests.” Internal Report 40007‐2, Norwegian Geotechnical Institute, Oslo, Norway.
11.
Ladd, C. C., et al. (1980). “Evaluation of compositional and engineering properties of offshore Venezuelan soils, Volume 1: Orinoco clay (Gulf of Paria and Orinoco Delta).” Research Report No. R80‐14, Dept. of Civil Engineering, Massachusetts Institute of Technology, Boston, Mass.
12.
Ladd, C. C., and Foott, R. (1974). “New design procedure for stability of soft clays,” J. Geotech. Engrg. Div., ASCE, 100(GT7), 763–786.
13.
Ladd, C. C., et al. (1977). “Stress‐deformation and strength characteristics.” Proceedings, 9th International Conference on Soil Mechanics and Foundation Engineering, Tokyo, Japan, Vol. 2, 421–494.
14.
Ladd, C. C., et al. (1981). “Evaluation of compositional and engineering properties of offshore Venezuelan soils: Vol. 2, North of Paria stiff clays.” Research Report No. R81‐21, Dept. of Civil Engineering, Massachusetts Institute of Technology, Cambridge, Mass.
15.
Loken, T. (1976). “Geology of superficial sediments in the northern North Sea.” Proceedings, International Conference on the Behavior of Offshore Structures, BOSS '76, Trondheim, Norway, Vol. 1, 501–515.
16.
Mase, G. E. (1970). “Theory and problems of continuum mechanics.” Schaum's Outline Series, McGraw‐Hill, Inc., New York, N.Y.
17.
Masing, G. (1926). “Eigenspannungen und Verfestigung beim Messing.” Proceedings, Second International Congress of Applied Mechanics, 332–335 (in German).
18.
Mishu, R., et al. (1982). “Evaluation of compositional and engineering properties of offshore Venezuelan soils: Vol. 3, Tuy Cariaco clays.” Research Report, No. R82‐31, Dept. of Civil Engineering, Massachusetts Institute of Technology, Cambridge, Mass.
19.
NGI. (1975). “Research project, repated loading on clay: summary and interpretation of test results.” Report 74037‐9, Norwegian Geotechnical Institute, Oslo, Norway.
20.
Prevost, J. H. (1977). “Mathematical modelling of monotonic and cyclic undrained clay behavior.” Int. J. Numer. Anal. Methods Geomech., 1(2), 195–216.
21.
Prevost, J. H., and Hoeg, K. (1975). “Soil mechanics and plasticity analysis of strain softening.” Geotechnique, 25(2), 279–297.
22.
Pyke, R. (1979). “Nonlinear soil models for irregular cyclic loadings.” J. Geotech. Engrg. Div., ASCE, 105(GT6), 715–726.
23.
Ramberg, W., and Osgood, W. R. (1943). “Description of stress‐strain curves by three parameters.” Technical Note 902, National Advisory Committee for Aeronautics, Washington, D.C.
24.
Vucetic, M. (1986). “The stress‐strain behavior of an offshore clay under irregular cyclic simple shear loading.” Report No. CE‐86‐02, Civil Engineering Department, Rensselaer Polytechnic Institute, Troy, N.Y.
25.
Vucetic, M., et al. (1985). “Cyclic simple shear behavior of overconsolidated offshore clay.” Proceedings, Second International Conference on Soil Dynamics and Earthquake Engineering, On board the liner Queen Elizabeth II, 107–116.
26.
Vucetic, M., and Dobry, R. (1986). “Cyclic degradation of normally and overconsolidated clays under simple shear loading conditions.” Report No. CE 86‐01, Civil Engineering Dept., Rensselaer Polytechnic Institute, Troy, N.Y.
27.
Vucetic, M., and Lacasse, S. (1982). “Specimen size effect in simple shear test.” J. Geotech. Engrg. Div., ASCE, 108(GT12), 1567–1585.
28.
Zienkiewicz, O. C., Chang, C. T., and Hinton, E. (1978). “Non‐linear seismic response and liquefaction.” Int. J. Numer. Anal. Methods Geomech., 2(4), 381–404.
Information & Authors
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Published In
Journal of Geotechnical Engineering
Volume 114 • Issue 2 • February 1988
Pages: 133 - 149
Copyright
Copyright © 1988 ASCE.
History
Published online: Feb 1, 1988
Published in print: Feb 1988
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