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- W4367692605 abstract "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 $${sigma }_{max}^{sw}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msubsup> <mml:mi>σ</mml:mi> <mml:mrow> <mml:mi>max</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>sw</mml:mi> </mml:mrow> </mml:msubsup> </mml:math> , swelling parameter $$k$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>k</mml:mi> </mml:math> , and diffusion coefficient $$D$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>D</mml:mi> </mml:math> 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." @default.
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- W4367692605 date "2023-05-03" @default.
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- W4367692605 title "A Hydro-mechanical Approach to Model Swelling Tests of Clay-Sulfate Rocks" @default.
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- W4367692605 doi "https://doi.org/10.1007/s00603-023-03343-x" @default.
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