Evaluation of Data Analysis Methods for the CRS Consolidation Test
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 140, Issue 6
Abstract
The constant rate-of-strain (CRS) laboratory consolidation test is used to measure consolidation properties of fine-grained soils. Although the CRS test offers many advantages over the conventional incremental-loading consolidation test, uncertainties associated with the method of data analysis have presented an obstacle to more widespread use of the CRS test in practice. This paper presents results from a numerical investigation of the accuracy of linear and nonlinear data analysis methods for the CRS consolidation test. Numerical simulations were conducted using a validated large strain consolidation model for CRS loading conditions, published material properties for two reconstituted clay soils, and three applied strain rates. Based on the numerical results, recommendations are provided for analysis of CRS consolidation data, including changes to the ASTM D4186 equations for nonlinear data analysis. The most appropriate analysis method for soils with linear compressibility is the current ASTM D4186 linear theory method. The most appropriate analysis method for soils with nonlinear compressibility is the proposed modified nonlinear (MNL) theory method. These recommended congruent analysis methods provided good to excellent results for normally consolidated, steady-state conditions, including constant or variable coefficient of consolidation, but yielded large errors for overconsolidated conditions near the preconsolidation stress. As a precaution, CRS tests for overconsolidated soils should generally be conducted using lower strain rates.
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Acknowledgments
Financial support for this investigation was provided by Grant No. CMMI-1001023 from the Geotechnical Engineering Program of the U.S. National Science Foundation. This support is gratefully acknowledged. The authors also thank Dr. Thomas C. Sheahan, Senior Associate Dean for Academic Affairs and Professor of Civil & Environmental Engineering at Northwestern University, for providing additional information on CRS tests conducted for Boston blue clay and comments on this paper.
References
Armour, D. W., Jr., and Drnevich, V. P. (1986). “Improved techniques for the constant-rate-of-strain consolidation test.” STP 892, ASTM, West Conshohocken, PA, 170–183.
ASTM. (2006). “Standard test method for one-dimensional consolidation properties of saturated cohesive soils using controlled-strain loading.” D4186-06, West Conshohocken, PA.
Crawford, C. B. (1988). “On the importance of rate of strain in the consolidation test.” Geotech. Test. J., 11(1), 60–62.
Fox, P. J., and Berles, J. D. (1997). “CS2: A piecewise-linear model for large strain consolidation.” Int. J. Numer. Anal. Methods Geomech., 21(7), 453–475.
Fox, P. J., and Pu, H. (2012). “Enhanced CS2 model for large strain consolidation.” Int. J. Geomech., 574–583.
Gorman, C. T., Hopkins, T. C., Deen, R. C., and Drnevich, V. P. (1978). “Constant-rate-of-strain and controlled-gradient consolidation testing.” Geotech. Test. J., 1(1), 3–15.
Hamilton, J. J., and Crawford, C. B. (1959). “Improved determination of preconsolidation pressure of a sensitive clay.” STP 254, ASTM, West Conshohocken, PA.
Lee, J., and Fox, P. J. (2009). “Investigation of consolidation-induced solute transport. II: Experimental and numerical results.” J. Geotech. Geoenviron. Eng., 1239–1253.
Lee, K., Choa, V., Lee, S. H., and Quek, S. H. (1993). “Constant rate of strain consolidation of Singapore marine clay.” Geotechnique, 43(3), 471–488.
Leroueil, S., Kabbaj, M., Tavenas, F., and Bouchard, R. (1985). “Stress-strain-strain rate relation for the compressibility of sensitive natural clays.” Geotechnique, 35(2), 159–180.
Pu, H. F., Fox, P. J., and Liu, Y. (2013). “Model for large strain consolidation under constant rate of strain.” Int. J. Numer. Anal. Methods Geomech., 37(11), 1574–1590.
Sample, K. M., and Shackelford, C. D. (2012). “Apparatus for constant rate-of-strain consolidation of slurry mixed soils.” Geotech. Test. J., 35(3), 409–419.
Sheahan, T. C., and Watters, P. J. (1997). “Experimental verification of CRS consolidation theory.” J. Geotech. Geoenviron. Eng., 430–437.
Silvestri, V., Yong, R. N., Soulié, M., and Gabriel, F. (1986). “Controlled-strain, controlled-gradient, and standard consolidation testing of sensitive clays.” STP 892, ASTM, West Conshohocken, PA, 433–450.
Smith, R. E., and Wahls, H. E. (1969). “Consolidation under constant rate of strain.” J. Soil Mech. and Found. Div., 95(2), 519–539.
Vaid, Y. P., Robertson, P. K., and Campanella, R. G. (1979). “Strain rate behaviour of Saint-Jean-Vianney clay.” Can. Geotech. J., 16(1), 34–42.
Wissa, A. E. Z., Christian, J. T., Davis, E. H., and Heiberg, S. (1971). “Consolidation at constant rate of strain.” J. Soil Mech. and Found. Div., 97(10), 1393–1413.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 140 • Issue 6 • June 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 4, 2013
Accepted: Jan 31, 2014
Published online: Mar 14, 2014
Published in print: Jun 1, 2014
Discussion open until: Aug 14, 2014
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