Temperature-dependent residual shear strength of bentonite: experimental investigation and numerical modelling
Temperature-dependent residual shear strength of bentonite: experimental investigation and numerical modelling
This paper describes experimental and numerical approaches to account for the effect of temperature on the residual shear strength of soil under slow-to-rapid shearing rates. We used ring-shear test results obtained on reconstituted samples of Ca-Mg bentonite, which were sheared to evaluate the drained residual friction angle ( ) under various confining stresses ( ), shearing rates ( ), and temperatures ( ). These results highlighted a dependence of on both and . In particular, thermal strengthening was observed under relatively low , which turned into thermal weakening under high . To reproduce this behaviour, we propose a non-isothermal viscoplastic model, which we implemented in a finite-element computer code for thermo-hydro-mechanical analysis of porous media. We calibrated the model using the experimental results, achieving a satisfactory performance. Owing to the significance of thermal effects in soil, we argue that approaches such as ours should be developed further and incorporated in modelling practices.
Saeed Tourchi; Marco Loche; Gianvito Scaringi
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
7. Dams, embankments and slopes
https://doi.org/10.53243/NUMGE2023-115
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