Location
San Diego, California
Presentation Date
29 Mar 2001, 4:00 pm - 6:00 pm
Abstract
A series of undrained cyclic torsional shear tests was conducted to investigate the effects of initial confining stress level on liquefaction resistance of sand. Hollow-cylindrical dense specimens with outer diameter of 10 cm, inner diameter of 6 cm and height of 20 cm are prepared with two kinds of sand. After being saturated, they were isotropically consolidated under an initial confining stress σc’ of 4.9, 9.8 or 98 kPa, and subjected to undrained cyclic torsional shear while maintaining the axial and lateral stresses constant. The amplitude of the cyclic torsional shear stress τcy was kept constant with a correction for the effects of membrane force. As a result, for both sands, the cyclic shear stress ratio τcy/ σc’ to cause liquefaction in a specified number of cycles was found to increase as the initial confining stress σc’ decreased. This tendency is consistent with the results of previous studies based on undrained cyclic triaxial tests. Such increase in the liquefaction resistance under low confining stress levels should be considered in analyzing relevant model test results. It was also demonstrated that in conducting cyclic torsional shear tests under low confining stresses, correction for the effects of membrane force is indispensable.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
4th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 2001 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Koseki, Jinichi; Itakura, Daisuke; Kawakami, Sadahiro; and Sato, Takeshi, "Cyclic Torsional Shear Tests on Liquefaction Resistance of Sands Under Low Confining Stress" (2001). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 3.
https://scholarsmine.mst.edu/icrageesd/04icrageesd/session01/3
Included in
Cyclic Torsional Shear Tests on Liquefaction Resistance of Sands Under Low Confining Stress
San Diego, California
A series of undrained cyclic torsional shear tests was conducted to investigate the effects of initial confining stress level on liquefaction resistance of sand. Hollow-cylindrical dense specimens with outer diameter of 10 cm, inner diameter of 6 cm and height of 20 cm are prepared with two kinds of sand. After being saturated, they were isotropically consolidated under an initial confining stress σc’ of 4.9, 9.8 or 98 kPa, and subjected to undrained cyclic torsional shear while maintaining the axial and lateral stresses constant. The amplitude of the cyclic torsional shear stress τcy was kept constant with a correction for the effects of membrane force. As a result, for both sands, the cyclic shear stress ratio τcy/ σc’ to cause liquefaction in a specified number of cycles was found to increase as the initial confining stress σc’ decreased. This tendency is consistent with the results of previous studies based on undrained cyclic triaxial tests. Such increase in the liquefaction resistance under low confining stress levels should be considered in analyzing relevant model test results. It was also demonstrated that in conducting cyclic torsional shear tests under low confining stresses, correction for the effects of membrane force is indispensable.
