Pore Water Pressure Response of Soil Subjected to Dynamic Loading under Saturated and Unsaturated Conditions
Publication: International Journal of Geomechanics
Volume 16, Issue 6
Abstract
This study presents the results of one of the first attempts to characterize the pore water pressure response of soils subjected to dynamic loading under saturated and unsaturated conditions. The resilient modulus, which captures the soil stiffness under dynamic loading, is a critical parameter for pavement design. It has been recognized that the development of pore water pressure contributes to modulus degradation. Several efforts have been directed to model the effect of air and water pore pressures upon the modulus. However, none of them considered dynamic changes in pressures but rather were based on equilibrium values corresponding to either initial or final conditions. A testing program was conducted to characterize the pore water pressure response of a clayey sand subjected to dynamic loading. Using the results, models capable of predicting the cumulative excess pore pressure under both saturated and unsaturated conditions were proposed. Findings regarding the influence of the controlled variables challenge common beliefs. Upon further research, the proposed models may become a powerful tool not only to overcome unsaturated soil testing limitations, but also to prevent soil failure as a result of excessive pore water pressure development.
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Acknowledgments
The authors acknowledge the general overview, guidance, valuable input, and recommendations to conduct this study from Dr. Matthew Witczak.
References
Andersen, K. H., Rosenbrand, W. F., Brown, S. F., and Pool, J. H. (1980). “Cyclic and static laboratory test on drammen clay.” J. Geotech. Engrg., 106(5), 499–529.
Ansal, A. M., and Erken, A. (1989). “Undrained behavior of clay under cyclic shear stresses.” J. Geotech. Engrg., 968–983.
Barksdale, R. D. (1971). “A compressive stress pulse times in flexible pavements for use in dynamic testing.” Highway Res. Rec., 345, 32–44.
Bishop, W., and Henkel, D. J. (1957). The measurement of soil properties in the triaxial test, Edward Arnold, Ltd., London.
Brown, S. F., Lashine, K. F., and Hyde, A. F. L. (1975). “Repeated load triaxial testing of a silty clay.” Géotechnique, 15(1), 95–114.
Cary, C. E. (2008). “Resilient modulus testing for unsaturated unbound materials.” Master’s thesis, Arizona State University, Tempe, AZ.
Cary, C. E. (2011). “Pore water pressure response of a soil subjected to traffic loading under saturated and unsaturated conditions.” Doctoral dissertation, Arizona State University, Tempe, AZ.
Cary, C. E., and Zapata, C. E. (2010). “Enhanced model for resilient response of soils resulting from seasonal changes as implemented in mechanistic-empirical pavement design guide.” Transp. Res. Rec., 2170, 36–44.
Cary, C. E., and Zapata, C. E. (2011). “Resilient modulus for unsaturated unbound materials.” Road Mater. Pavement Des., 12(3), 615–638.
Fredlund, D. G., and Rahardjo, H. (1993). Soil mechanics for unsaturated soils, John Wiley and Sons, Inc., New York.
Fredlund, D. (2006). “Unsaturated soil mechanics in engineering practice.” J. Geotech. Geoenviron. Eng., 286–321.
Hsu, C., and Vucetic, M. (2006). “Threshold shear strain for cyclic pore-water pressure in cohesive soils.” J. Geotech. Geoenviron. Eng., 1325–1335.
Kim, C.-K., Hwang, W.-K., Choi, Y., Lee, M., and Kim, T.-H. (2009). “Characteristics of pore pressure and volume change during undrained loading of unsaturated compacted granite soil.” Soils and rock instrumentation, behavior, and modeling: Selected papers from the 2009 GeoHunan International Conference, Geotechnical special publication 194, L. Ge, B. Tang, W. Wei, and R. Chen eds., ASCE, Reston, VA, 50–56.
Lashine, A. K. (1971). “Some aspects of the characteristics of keuper marl under repeated loading.” Doctoral dissertation, University of Nottingham, Nottingham, U.K.
Mendoza, M. J., and Hernandez, V. M. (1994). “Pore-pressure build-up under cyclic loading in Mexico City clay.” Proc., 13th Int. Conf. on Soil Mechanics and Foundations Engineering, CRC Press, Boca Raton, FL, 181–186.
Minh Thu, T., Rahardjo, H., and Leong, E. (2006). “Shear strength and pore-water pressure characteristics during constant water content triaxial tests.” J. Geotech. Geoenviron. Eng., 441–419.
NCHRP (National Cooperative Highway Research Program). (2004). “Laboratory determination of resilient modulus for flexible pavement design.” Research Results Digest 285, Transportation Research Board of the National Academies, Washington, D.C.
Ogawa, S., Shibayama, T., and Yamaguchi, H. (1977). “Dynamic strength of saturated cohesive soil.” Proc., 9th Int. Conf. on Soil Mechanics and Foundations Engineering, CRC Press, Boca Raton, FL, 317–320.
Skempton, W. F. (1954). “The pore pressure coefficients, A and B.” Géotechnique, 4(4), 143–147.
Yang, S., Lin, H., Kung, J. H. S., and Huang, W. (2008). “Suction-controlled laboratory test on resilient modulus of unsaturated compacted subgrade soils.” J. Geotech. Geoenviron. Eng., 1375–1384.
Zapata, C., and Cary, C. (2008). “A new generation of resilient modulus characterization of unbound materials.” Contemporary topics in ground modification, problem soils, and geo-support, Geotechnical special publication 187, M. Iskander, D. F. Laefer, and M. H. Hussein, eds. ASCE, Reston, VA, 377–384.
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Published In
International Journal of Geomechanics
Volume 16 • Issue 6 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Oct 2, 2014
Accepted: Dec 7, 2015
Published online: Feb 3, 2016
Discussion open until: Jul 3, 2016
Published in print: Dec 1, 2016
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