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Liquefaction Resistance of Desaturated and Partly Saturated Clean Sand
https://orcid.org/http://orcid.org/0000-0001-6693-3434
https://orcid.org/http://orcid.org/0000-0003-1626-2067
https://orcid.org/http://orcid.org/0000-0001-9804-5423
Induced desaturation has been emerging as a new liquefaction mitigation technique. Laboratory study carried out, so far, on induced desaturation has mainly focused on shaking table and centrifuge studies. In the present study, triaxial specimens of saturated clean sand have been desaturated by injecting air/CO2 into it and stress-controlled undrained cyclic triaxial tests have been conducted on such samples. Few tests have been conducted on partly saturated samples as well. It is observed that the presence of air in the sample increases the liquefaction resistance of the sand. Further, desaturation affected not only liquefaction resistance but also dilative and contractive tendency of the soil. Slope of the phase transformation line on compression side initially increased and then decreased with reduction in degree of saturation whereas slope of phase transformation line on extension side initially decreased and then increased with reduction in the degree of saturation. In most of the cases, slope of the phase transformation line on extension side is found to be smaller than that on compression side.
Liquefaction Resistance of Desaturated and Partly Saturated Clean Sand
https://orcid.org/http://orcid.org/0000-0001-6693-3434
https://orcid.org/http://orcid.org/0000-0003-1626-2067
https://orcid.org/http://orcid.org/0000-0001-9804-5423
Induced desaturation has been emerging as a new liquefaction mitigation technique. Laboratory study carried out, so far, on induced desaturation has mainly focused on shaking table and centrifuge studies. In the present study, triaxial specimens of saturated clean sand have been desaturated by injecting air/CO2 into it and stress-controlled undrained cyclic triaxial tests have been conducted on such samples. Few tests have been conducted on partly saturated samples as well. It is observed that the presence of air in the sample increases the liquefaction resistance of the sand. Further, desaturation affected not only liquefaction resistance but also dilative and contractive tendency of the soil. Slope of the phase transformation line on compression side initially increased and then decreased with reduction in degree of saturation whereas slope of phase transformation line on extension side initially decreased and then increased with reduction in the degree of saturation. In most of the cases, slope of the phase transformation line on extension side is found to be smaller than that on compression side.
Liquefaction Resistance of Desaturated and Partly Saturated Clean Sand
https://orcid.org/http://orcid.org/0000-0001-6693-3434
https://orcid.org/http://orcid.org/0000-0003-1626-2067
https://orcid.org/http://orcid.org/0000-0001-9804-5423
Induced desaturation has been emerging as a new liquefaction mitigation technique. Laboratory study carried out, so far, on induced desaturation has mainly focused on shaking table and centrifuge studies. In the present study, triaxial specimens of saturated clean sand have been desaturated by injecting air/CO2 into it and stress-controlled undrained cyclic triaxial tests have been conducted on such samples. Few tests have been conducted on partly saturated samples as well. It is observed that the presence of air in the sample increases the liquefaction resistance of the sand. Further, desaturation affected not only liquefaction resistance but also dilative and contractive tendency of the soil. Slope of the phase transformation line on compression side initially increased and then decreased with reduction in degree of saturation whereas slope of phase transformation line on extension side initially decreased and then increased with reduction in the degree of saturation. In most of the cases, slope of the phase transformation line on extension side is found to be smaller than that on compression side.
Liquefaction Resistance of Desaturated and Partly Saturated Clean Sand
Lecture Notes in Civil Engineering
Sitharam, T. G. (editor) / Dinesh, S. V. (editor) / Jakka, Ravi (editor) / Chavan, Dhanaji (author) / Sitharam, T. G. (author) / Anbazhagan, P. (author)
2021-04-01
10 pages
Article/Chapter (Book)
Electronic Resource
English
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