Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Numerical Study of the Effectiveness of Bentonite Treatment for Liquefaction Mitigation
This paper presents the results of a numerical study investigating the effectiveness at the field scale of a liquefaction mitigation technique based on the replacement of the soil pore fluid by a thixotropic bentonite suspension. While previous laboratory experimental work has demonstrated that this method increases the liquefaction resistance of sands in undrained cyclic triaxial tests, questions remain with regard to the field-scale performance, and the extent of soil treatment required. For this numerical study a bounding surface-based constitutive model was implemented in the finite difference software FLAC. Model parameters were obtained for the untreated and the bentonite treated sand, using experimental data, which included monotonic and cyclic triaxial and resonant column results. The implemented model is used to analyze the problem of a verticallyvibrating footing founded on a saturated sand. Loss of mean effective stress and settlement of the footing are used as performance indicators to assess the impact of soil treatment. For the case examined, the model indicates that a targeted soil treatment forestalls the onset of liquefaction in the bentonite treated soil.
Numerical Study of the Effectiveness of Bentonite Treatment for Liquefaction Mitigation
This paper presents the results of a numerical study investigating the effectiveness at the field scale of a liquefaction mitigation technique based on the replacement of the soil pore fluid by a thixotropic bentonite suspension. While previous laboratory experimental work has demonstrated that this method increases the liquefaction resistance of sands in undrained cyclic triaxial tests, questions remain with regard to the field-scale performance, and the extent of soil treatment required. For this numerical study a bounding surface-based constitutive model was implemented in the finite difference software FLAC. Model parameters were obtained for the untreated and the bentonite treated sand, using experimental data, which included monotonic and cyclic triaxial and resonant column results. The implemented model is used to analyze the problem of a verticallyvibrating footing founded on a saturated sand. Loss of mean effective stress and settlement of the footing are used as performance indicators to assess the impact of soil treatment. For the case examined, the model indicates that a targeted soil treatment forestalls the onset of liquefaction in the bentonite treated soil.
Numerical Study of the Effectiveness of Bentonite Treatment for Liquefaction Mitigation
Witthoeft, A. F. (Autor:in) / Santagata, M. C. (Autor:in) / Bobet, A. (Autor:in)
GeoCongress 2012 ; 2012 ; Oakland, California, United States
GeoCongress 2012 ; 1958-1967
29.03.2012
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Numerical Study of the Effectiveness of Bentonite Treatment for Liquefaction Mitigation
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