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Degree of saturation affecting liquefaction resistance and undrained shear strength of silty sands
Abstract The undrained shear strength and liquefaction cyclic resistance of silty sands are examined based on a large number of laboratory triaxial test results. The influence of saturation on the liquefaction triggering and occurrence of liquefaction-induced flow slides is highlighted. The laboratory triaxial tests are conducted separately in the three phases of full saturation, partial saturation and unsaturation. The past studies of the authors’ are first reviewed and some new data are added where appropriate. The different responses of silty sands in those three phases of saturation are discussed in detail.
Highlights The influence of saturation on the liquefaction resistance and undrained shear strength is examined based on the laboratory triaxial tests. In full saturation, the largest value of undrained shear strength ratio causing “flow” is 0.24. In partial saturation, the ranges of B-value causing “flow” are different for triaxial compression and extension. In unsaturation, the condition of “flow” only occurs under the value of Sr greater than 60% in triaxial extension. Partial saturation and unsaturation lead to the apparent increase of liquefaction resistance up to 2–3 times greater than full saturation. Overall, those three phases were found to yield to distinctly different responses of silty sands and led to different characteristics in the undrained shear strength and liquefaction cyclic resistance.
Degree of saturation affecting liquefaction resistance and undrained shear strength of silty sands
Abstract The undrained shear strength and liquefaction cyclic resistance of silty sands are examined based on a large number of laboratory triaxial test results. The influence of saturation on the liquefaction triggering and occurrence of liquefaction-induced flow slides is highlighted. The laboratory triaxial tests are conducted separately in the three phases of full saturation, partial saturation and unsaturation. The past studies of the authors’ are first reviewed and some new data are added where appropriate. The different responses of silty sands in those three phases of saturation are discussed in detail.
Highlights The influence of saturation on the liquefaction resistance and undrained shear strength is examined based on the laboratory triaxial tests. In full saturation, the largest value of undrained shear strength ratio causing “flow” is 0.24. In partial saturation, the ranges of B-value causing “flow” are different for triaxial compression and extension. In unsaturation, the condition of “flow” only occurs under the value of Sr greater than 60% in triaxial extension. Partial saturation and unsaturation lead to the apparent increase of liquefaction resistance up to 2–3 times greater than full saturation. Overall, those three phases were found to yield to distinctly different responses of silty sands and led to different characteristics in the undrained shear strength and liquefaction cyclic resistance.
Degree of saturation affecting liquefaction resistance and undrained shear strength of silty sands
Tsukamoto, Yoshimichi (author)
Soil Dynamics and Earthquake Engineering ; 124 ; 365-373
2018-04-25
9 pages
Article (Journal)
Electronic Resource
English
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