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Characterizations of tensile yield and failure processes of frozen clay soils: laboratory testing and numerical modeling
https://orcid.org/0000-0002-7971-0085
Abstract An accurate characterization of the tensile failure processes of frozen soils under a warming environment is critical for predicting geological disasters such as thawing-induced slumps. In this study, the approaches of rod bar splitting test and double punch test are applied to measure the tensile strength of artificially prepared frozen sandy clay samples with the same clay fraction. The tests are conducted in a temperature-controlled cold room, and the applied temperature ranges from −15 to 0 °C. Our laboratory tests demonstrate that the rod bar splitting tests tend to overestimate frozen clay soil’s strength, which is owing to the increase in the contact area between loading strips and samples. By contrast, the double punch tests keep the same contacting area and provide more reliable results. The tensile strength-temperature relationships covering a temperature from −15 to 0 °C are modeled using an updated power law function. Our results show that the measured tensile strengths are highly dependent on the applied deformation rates. Finite element numerical simulations are conducted to investigate the tensile yield and failure processes in the studied frozen soil samples. The stress paths at key monitoring points are retrieved to demonstrate the tensile yield behavior. Impacts from the sample size and experimental conditions on estimated tensile strengths are analyzed, and optimized sample and puncher sizes are determined. Our numerical results confirm that the double punch test is an effective and reliable approach in measuring the tensile strength of frozen clay soils.
Characterizations of tensile yield and failure processes of frozen clay soils: laboratory testing and numerical modeling
https://orcid.org/0000-0002-7971-0085
Abstract An accurate characterization of the tensile failure processes of frozen soils under a warming environment is critical for predicting geological disasters such as thawing-induced slumps. In this study, the approaches of rod bar splitting test and double punch test are applied to measure the tensile strength of artificially prepared frozen sandy clay samples with the same clay fraction. The tests are conducted in a temperature-controlled cold room, and the applied temperature ranges from −15 to 0 °C. Our laboratory tests demonstrate that the rod bar splitting tests tend to overestimate frozen clay soil’s strength, which is owing to the increase in the contact area between loading strips and samples. By contrast, the double punch tests keep the same contacting area and provide more reliable results. The tensile strength-temperature relationships covering a temperature from −15 to 0 °C are modeled using an updated power law function. Our results show that the measured tensile strengths are highly dependent on the applied deformation rates. Finite element numerical simulations are conducted to investigate the tensile yield and failure processes in the studied frozen soil samples. The stress paths at key monitoring points are retrieved to demonstrate the tensile yield behavior. Impacts from the sample size and experimental conditions on estimated tensile strengths are analyzed, and optimized sample and puncher sizes are determined. Our numerical results confirm that the double punch test is an effective and reliable approach in measuring the tensile strength of frozen clay soils.
Characterizations of tensile yield and failure processes of frozen clay soils: laboratory testing and numerical modeling
https://orcid.org/0000-0002-7971-0085
Abstract An accurate characterization of the tensile failure processes of frozen soils under a warming environment is critical for predicting geological disasters such as thawing-induced slumps. In this study, the approaches of rod bar splitting test and double punch test are applied to measure the tensile strength of artificially prepared frozen sandy clay samples with the same clay fraction. The tests are conducted in a temperature-controlled cold room, and the applied temperature ranges from −15 to 0 °C. Our laboratory tests demonstrate that the rod bar splitting tests tend to overestimate frozen clay soil’s strength, which is owing to the increase in the contact area between loading strips and samples. By contrast, the double punch tests keep the same contacting area and provide more reliable results. The tensile strength-temperature relationships covering a temperature from −15 to 0 °C are modeled using an updated power law function. Our results show that the measured tensile strengths are highly dependent on the applied deformation rates. Finite element numerical simulations are conducted to investigate the tensile yield and failure processes in the studied frozen soil samples. The stress paths at key monitoring points are retrieved to demonstrate the tensile yield behavior. Impacts from the sample size and experimental conditions on estimated tensile strengths are analyzed, and optimized sample and puncher sizes are determined. Our numerical results confirm that the double punch test is an effective and reliable approach in measuring the tensile strength of frozen clay soils.
Characterizations of tensile yield and failure processes of frozen clay soils: laboratory testing and numerical modeling
Li, Biao (Autor:in) / Akhtar, Sohail (Autor:in)
2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
Laboratory investigation on tensile strength characteristics of warm frozen soils
| Online Contents | 2015
Numerical Modeling of Frozen Soils
| ASCE | 2014
Numerical Modeling of Frozen Soils
| British Library Conference Proceedings | 2014
Dielectric properties of frozen clay and silt soils
| Elsevier | 1992