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Centrifuge tests on geosynthetic-encased stone column supported embankment on seasonal frozen soil
https://orcid.org/0000-0002-8245-924X
Abstract Geosynthetic-encased stone columns (GESCs) have been widely applied into soft foundation. This paper aimed to evaluate the availability and efficiency of GESCs in seasonal frozen ground. Four centrifuge tests were conducted on GESCs supported embankment on seasonal frozen soil under embankment load and thawing, where the foundation was frozen before the construction of embankment. The effects of encasement stiffness and lateral reinforced cushion were investigated. Three phases could be distinguished in the tests by two timing nodes due to the complete thawing of columns and soil, and analysis were made based on the three phases. It is found that high-stiffness encasement can effectively reduce the differential settlement between soil and columns before complete thawing of soil. The GESCs appeared a deformation mode of inward bending, which is in inverse to that in common composite foundation. The reinforced cushion rearranged stress on columns and soil, and influenced the development of pore pressure. The stress concentration ratio (SCR) first decreased to less than 1 due to column thawing, and experienced a steady stage until soil was completely thawed. The SCR rapidly increased after complete thawing of soil, and decreased to a constant value due to soil consolidation.
Highlights The behavior of composite foundation with geosynthetic-encased stone columns was studied under embankment load and thawing. The deformation mode of GESCs after freezing and thawing were found different from that without freeze-thaw conditions. Stress on soil and columns varied with the process of soil and column thawing. Pore pressure was not always dissipating due to freezing and thawing, and was influenced by the reinforced cushion.
Centrifuge tests on geosynthetic-encased stone column supported embankment on seasonal frozen soil
https://orcid.org/0000-0002-8245-924X
Abstract Geosynthetic-encased stone columns (GESCs) have been widely applied into soft foundation. This paper aimed to evaluate the availability and efficiency of GESCs in seasonal frozen ground. Four centrifuge tests were conducted on GESCs supported embankment on seasonal frozen soil under embankment load and thawing, where the foundation was frozen before the construction of embankment. The effects of encasement stiffness and lateral reinforced cushion were investigated. Three phases could be distinguished in the tests by two timing nodes due to the complete thawing of columns and soil, and analysis were made based on the three phases. It is found that high-stiffness encasement can effectively reduce the differential settlement between soil and columns before complete thawing of soil. The GESCs appeared a deformation mode of inward bending, which is in inverse to that in common composite foundation. The reinforced cushion rearranged stress on columns and soil, and influenced the development of pore pressure. The stress concentration ratio (SCR) first decreased to less than 1 due to column thawing, and experienced a steady stage until soil was completely thawed. The SCR rapidly increased after complete thawing of soil, and decreased to a constant value due to soil consolidation.
Highlights The behavior of composite foundation with geosynthetic-encased stone columns was studied under embankment load and thawing. The deformation mode of GESCs after freezing and thawing were found different from that without freeze-thaw conditions. Stress on soil and columns varied with the process of soil and column thawing. Pore pressure was not always dissipating due to freezing and thawing, and was influenced by the reinforced cushion.
Centrifuge tests on geosynthetic-encased stone column supported embankment on seasonal frozen soil
https://orcid.org/0000-0002-8245-924X
Abstract Geosynthetic-encased stone columns (GESCs) have been widely applied into soft foundation. This paper aimed to evaluate the availability and efficiency of GESCs in seasonal frozen ground. Four centrifuge tests were conducted on GESCs supported embankment on seasonal frozen soil under embankment load and thawing, where the foundation was frozen before the construction of embankment. The effects of encasement stiffness and lateral reinforced cushion were investigated. Three phases could be distinguished in the tests by two timing nodes due to the complete thawing of columns and soil, and analysis were made based on the three phases. It is found that high-stiffness encasement can effectively reduce the differential settlement between soil and columns before complete thawing of soil. The GESCs appeared a deformation mode of inward bending, which is in inverse to that in common composite foundation. The reinforced cushion rearranged stress on columns and soil, and influenced the development of pore pressure. The stress concentration ratio (SCR) first decreased to less than 1 due to column thawing, and experienced a steady stage until soil was completely thawed. The SCR rapidly increased after complete thawing of soil, and decreased to a constant value due to soil consolidation.
Highlights The behavior of composite foundation with geosynthetic-encased stone columns was studied under embankment load and thawing. The deformation mode of GESCs after freezing and thawing were found different from that without freeze-thaw conditions. Stress on soil and columns varied with the process of soil and column thawing. Pore pressure was not always dissipating due to freezing and thawing, and was influenced by the reinforced cushion.
Centrifuge tests on geosynthetic-encased stone column supported embankment on seasonal frozen soil
Gu, Zi-Ang (author) / Niu, Fu-Jun (author) / Chen, Jian-Feng (author) / Wang, Xing-Tao (author)
Geotextiles and Geomembranes ; 50 ; 922-931
2022-05-30
10 pages
Article (Journal)
Electronic Resource
English