Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A Hydro-mechanical Approach to Model Swelling Tests of Clay-Sulfate Rocks
https://orcid.org/0000-0002-0290-8106
Abstract We developed a coupled hydro-mechanical (HM) model based on a semi-logarithmic swelling law to reproduce the outcomes of swelling tests of a clay-sulfate rock specimen collected from the Freudenstein tunnel, which was constructed in Triassic Grabfeld Formation (formerly Gipskeuper = “Gypsum Keuper”) in Southwest Germany in the period of 1987–1991. The swelling tests were conducted using an oedometer apparatus under constrained (no strain) or constant load conditions. We used the strain–time data obtained from the laboratory testing to calibrate the HM model. We then ran a sensitivity analysis to reveal the importance of influential parameters, namely the maximum swelling pressure $${\sigma }_{max}^{sw}$$, swelling parameter $$k$$, and diffusion coefficient $$D$$ on the long-term swelling behaviour of clay-sulfate rocks under the oedometer conditions. The HM model is capable of predicting long-term swelling deformations, i.e., model results were found to agree reasonably well with the experimental data. The results also show that using only 12 months experimental strain–time data to calibrate the HM model leads to an underestimation of swelling strains at the equilibrium condition. The findings show that at least 24 months experimental data is required for the model calibration.
Highlights We developed a coupled hydro-mechanical model to simulate swelling tests of clay-sulfate rock specimens.The hydro-mechanical model describes the long-term swelling behaviour under oedometer conditions well.The findings show that at least 24 months strain-time experimental data is required to properly calibrating the HM model.
A Hydro-mechanical Approach to Model Swelling Tests of Clay-Sulfate Rocks
https://orcid.org/0000-0002-0290-8106
Abstract We developed a coupled hydro-mechanical (HM) model based on a semi-logarithmic swelling law to reproduce the outcomes of swelling tests of a clay-sulfate rock specimen collected from the Freudenstein tunnel, which was constructed in Triassic Grabfeld Formation (formerly Gipskeuper = “Gypsum Keuper”) in Southwest Germany in the period of 1987–1991. The swelling tests were conducted using an oedometer apparatus under constrained (no strain) or constant load conditions. We used the strain–time data obtained from the laboratory testing to calibrate the HM model. We then ran a sensitivity analysis to reveal the importance of influential parameters, namely the maximum swelling pressure $${\sigma }_{max}^{sw}$$, swelling parameter $$k$$, and diffusion coefficient $$D$$ on the long-term swelling behaviour of clay-sulfate rocks under the oedometer conditions. The HM model is capable of predicting long-term swelling deformations, i.e., model results were found to agree reasonably well with the experimental data. The results also show that using only 12 months experimental strain–time data to calibrate the HM model leads to an underestimation of swelling strains at the equilibrium condition. The findings show that at least 24 months experimental data is required for the model calibration.
Highlights We developed a coupled hydro-mechanical model to simulate swelling tests of clay-sulfate rock specimens.The hydro-mechanical model describes the long-term swelling behaviour under oedometer conditions well.The findings show that at least 24 months strain-time experimental data is required to properly calibrating the HM model.
A Hydro-mechanical Approach to Model Swelling Tests of Clay-Sulfate Rocks
https://orcid.org/0000-0002-0290-8106
Abstract We developed a coupled hydro-mechanical (HM) model based on a semi-logarithmic swelling law to reproduce the outcomes of swelling tests of a clay-sulfate rock specimen collected from the Freudenstein tunnel, which was constructed in Triassic Grabfeld Formation (formerly Gipskeuper = “Gypsum Keuper”) in Southwest Germany in the period of 1987–1991. The swelling tests were conducted using an oedometer apparatus under constrained (no strain) or constant load conditions. We used the strain–time data obtained from the laboratory testing to calibrate the HM model. We then ran a sensitivity analysis to reveal the importance of influential parameters, namely the maximum swelling pressure $${\sigma }_{max}^{sw}$$, swelling parameter $$k$$, and diffusion coefficient $$D$$ on the long-term swelling behaviour of clay-sulfate rocks under the oedometer conditions. The HM model is capable of predicting long-term swelling deformations, i.e., model results were found to agree reasonably well with the experimental data. The results also show that using only 12 months experimental strain–time data to calibrate the HM model leads to an underestimation of swelling strains at the equilibrium condition. The findings show that at least 24 months experimental data is required for the model calibration.
Highlights We developed a coupled hydro-mechanical model to simulate swelling tests of clay-sulfate rock specimens.The hydro-mechanical model describes the long-term swelling behaviour under oedometer conditions well.The findings show that at least 24 months strain-time experimental data is required to properly calibrating the HM model.
A Hydro-mechanical Approach to Model Swelling Tests of Clay-Sulfate Rocks
Taherdangkoo, Reza (Autor:in) / Barsch, Markus (Autor:in) / Ataallah, Ahmad (Autor:in) / Meng, Tao (Autor:in) / Liu, Quan (Autor:in) / Butscher, Christoph (Autor:in)
2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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