Voids and Granulometry: Effects on Shear Modulus of Unsaturated Sands
Publication: Journal of Geotechnical Engineering
Volume 119, Issue 2
Abstract
This paper describes the results of an experimental investigation of capillary effects on the low strain shear modulus of sands in a partially saturated condition. It studies: (1) Void ratio; (2) confining pressure; (3) grain shape; and (4) grain size distribution on shear modulus. The results of resonant column tests show that capillary stresses significantly increase the shear modulus of partially saturated sands. These effects are more pronounced for soils with low void ratios and confining pressures. The optimum degree of saturation increases with increasing void ratio and a linear relationship exists between the maximum shear modulus ratio and void ratio. The slope of this relationship is not affected by confining pressure and grain size distribution, and instead depends on the soil grain shape. If the smallest grains of a sand are larger than the 400 sieve size, the grain size distribution does not affect the optimum degree of saturation, but only affects the maximum shear modulus in a partially saturated condition. The content of the minus 400 sieve size fraction can affect both the maximum shear modulus and the optimum degree of saturation for unsaturated sands. Soil grain shape also affects both the maximum shear modulus and the optimum degree of saturation.
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References
1.
Drnevich, V. P. (1967). “Effects of strain history on the dynamic properties of sand,” PhD thesis, University of Michigan, Ann Arbor, Mich.
2.
Drnevich, V. P. (1978). “Resonant column testing—Problems and solutions.” Dynamic Geotechnical Testing, ASTM, STP 654, American Society for Testing and Materials, Philadelphia, Pa., 384–398.
3.
Hardin, B. O., and Richart, F. E., Jr. (1963). “Elastic wave velocities in granular soils.” J. Soil Mech. and Found. Engrg. Div., ASCE, 89(1), 33–65.
4.
Iida, K. (1938). “The velocity of elastic waves in sand.” Bull. Earthquake Res. Inst. Univ. Tokyo, 16, 131–144.
5.
Iida, K. (1940). “On the elastic properties of soil particularly in relation to its water content.” Bulletin of the Earthquake Research Institute, Tokyo Imperial University, Vol. 18, pp. 675–690.
6.
Qian, X. (1990). “Dynamic behavior of unsaturated cohesionless soils,” PhD thesis, University of Michigan, Ann Arbor, Mich.
7.
Richart, F. E., Jr., Hall, J. R., Jr., and Woods, R. D. (1970). “Vibrations of soils and foundations.” Prentice‐Hall, Inc., Englewood Cliffs, N.Y.
8.
Wilson, S. D., and Dietrich, R. J. (1960). “Effect of consolidation pressure on elastic and strength properties of clay.” Proc. Res. Conf. on Shear Strength of Cohesive Soils, ASCE.
9.
Woods, R. D. (1977). “Parameters affecting elastic properties.” Dynamical methods in soil and rock mechanics, Vol. 1, Karlsruhe, Germany, 37–60.
10.
Wu, S. (1983). “Capillary effects on dynamic modulus of fine‐grained cohesionless soils,” PhD thesis, University of Michigan, Ann Arbor, Mich.
11.
Wu, S., Gray, D. H., and Richart, F. E., Jr. (1984). “Capillary effects on dynamic modulus of sands and silts.” J. Geotech. Engrg. Div., ASCE, 110(9), 1188–1203.
12.
Youd, T. L. (1973). “Factor controlling maximum and minimum densities of sand.” Evaluation of relative density and its role in geotechnical projects involving cohesionless soils. ASTM STP 523, American Society for Testing and Materials, Philadelphia, Pa., 98–112.
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Copyright © 1993 American Society of Civil Engineers.
History
Received: Nov 13, 1990
Published online: Feb 1, 1993
Published in print: Feb 1993
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