Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Centrifuge investigation on behavior of geosynthetic-encased stone column supported embankment under freeze-thaw cycles
https://orcid.org/0000-0002-8245-924X
https://orcid.org/0000-0002-4188-8152
Abstract In this paper, two centrifuge tests were conducted on geosynthetic-encased stone column (GESC) supported embankment to investigate the behavior under freeze-thaw cycles considering the effects of initial degree of consolidation and number of freeze-thaw cycles. The embankments with a height of 4.5 m supported by GESC-reinforced foundation with a thickness of 9 m in prototype were first consolidated to initial degrees of consolidation of 30% and 60%, respectively, and then subjected to three freeze-thaw cycles. The results showed that the foundation soil under the embankment toe experienced a higher degree of freezing than the soil outside the embankment with non-uniform frozen depths observed at different positions in soil under the embankment, and that multiple freeze-thaw cycles contributed to extra settlement in the foundation. Both the frost heave and thaw settlement appeared on GESCs prior to soil. During freezing, the stress on GESC increased first, while decreased rapidly when soil began freezing. The stress concentration ratio (SCR) reached nearly 1.0 before complete freezing. After the complete thawing of GESCs, the stress on GESC increased significantly. As the number of freeze-thaw cycles grew, the variation in settlement, stress and pore pressure was reduced. The final settlement on soil was greater in the foundation with lower initial degree of consolidation, as well as the SCR. The GESCs had larger deformation and showed outward bending under lower initial degree of consolidation, but inward bending appeared on GESCs under higher one.
Highlights This paper investigated the behavior of GESC-supported embankment under freeze-thaw cycles. The frozen depths were found to vary in different positions, and frost heave and thaw settlement were observed. The deformation modes of GESCs were different considering the initial consolidation degrees. Stress on soil and GESCs experienced increase and decrease according to different timing nodes during freeze-thaw cycles. Dissipation of excess pore pressure depended on the periods of freezing or thawing.
Centrifuge investigation on behavior of geosynthetic-encased stone column supported embankment under freeze-thaw cycles
https://orcid.org/0000-0002-8245-924X
https://orcid.org/0000-0002-4188-8152
Abstract In this paper, two centrifuge tests were conducted on geosynthetic-encased stone column (GESC) supported embankment to investigate the behavior under freeze-thaw cycles considering the effects of initial degree of consolidation and number of freeze-thaw cycles. The embankments with a height of 4.5 m supported by GESC-reinforced foundation with a thickness of 9 m in prototype were first consolidated to initial degrees of consolidation of 30% and 60%, respectively, and then subjected to three freeze-thaw cycles. The results showed that the foundation soil under the embankment toe experienced a higher degree of freezing than the soil outside the embankment with non-uniform frozen depths observed at different positions in soil under the embankment, and that multiple freeze-thaw cycles contributed to extra settlement in the foundation. Both the frost heave and thaw settlement appeared on GESCs prior to soil. During freezing, the stress on GESC increased first, while decreased rapidly when soil began freezing. The stress concentration ratio (SCR) reached nearly 1.0 before complete freezing. After the complete thawing of GESCs, the stress on GESC increased significantly. As the number of freeze-thaw cycles grew, the variation in settlement, stress and pore pressure was reduced. The final settlement on soil was greater in the foundation with lower initial degree of consolidation, as well as the SCR. The GESCs had larger deformation and showed outward bending under lower initial degree of consolidation, but inward bending appeared on GESCs under higher one.
Highlights This paper investigated the behavior of GESC-supported embankment under freeze-thaw cycles. The frozen depths were found to vary in different positions, and frost heave and thaw settlement were observed. The deformation modes of GESCs were different considering the initial consolidation degrees. Stress on soil and GESCs experienced increase and decrease according to different timing nodes during freeze-thaw cycles. Dissipation of excess pore pressure depended on the periods of freezing or thawing.
Centrifuge investigation on behavior of geosynthetic-encased stone column supported embankment under freeze-thaw cycles
https://orcid.org/0000-0002-8245-924X
https://orcid.org/0000-0002-4188-8152
Abstract In this paper, two centrifuge tests were conducted on geosynthetic-encased stone column (GESC) supported embankment to investigate the behavior under freeze-thaw cycles considering the effects of initial degree of consolidation and number of freeze-thaw cycles. The embankments with a height of 4.5 m supported by GESC-reinforced foundation with a thickness of 9 m in prototype were first consolidated to initial degrees of consolidation of 30% and 60%, respectively, and then subjected to three freeze-thaw cycles. The results showed that the foundation soil under the embankment toe experienced a higher degree of freezing than the soil outside the embankment with non-uniform frozen depths observed at different positions in soil under the embankment, and that multiple freeze-thaw cycles contributed to extra settlement in the foundation. Both the frost heave and thaw settlement appeared on GESCs prior to soil. During freezing, the stress on GESC increased first, while decreased rapidly when soil began freezing. The stress concentration ratio (SCR) reached nearly 1.0 before complete freezing. After the complete thawing of GESCs, the stress on GESC increased significantly. As the number of freeze-thaw cycles grew, the variation in settlement, stress and pore pressure was reduced. The final settlement on soil was greater in the foundation with lower initial degree of consolidation, as well as the SCR. The GESCs had larger deformation and showed outward bending under lower initial degree of consolidation, but inward bending appeared on GESCs under higher one.
Highlights This paper investigated the behavior of GESC-supported embankment under freeze-thaw cycles. The frozen depths were found to vary in different positions, and frost heave and thaw settlement were observed. The deformation modes of GESCs were different considering the initial consolidation degrees. Stress on soil and GESCs experienced increase and decrease according to different timing nodes during freeze-thaw cycles. Dissipation of excess pore pressure depended on the periods of freezing or thawing.
Centrifuge investigation on behavior of geosynthetic-encased stone column supported embankment under freeze-thaw cycles
Gu, Zi-Ang (Autor:in) / Niu, Fu-Jun (Autor:in) / Chen, Jian-Feng (Autor:in) / Yoo, Chungsik (Autor:in)
Geotextiles and Geomembranes ; 52 ; 2-11
24.08.2023
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch