Temperature Dependence of the Residual Shear Strength: the Role of Clay Fraction
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F24%3A10487326" target="_blank" >RIV/00216208:11310/24:10487326 - isvavai.cz</a>
Výsledek na webu
<a href="https://doi.org/10.5592/CO/EUROENGEO.2024.149" target="_blank" >https://doi.org/10.5592/CO/EUROENGEO.2024.149</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.5592/CO/EUROENGEO.2024.149" target="_blank" >10.5592/CO/EUROENGEO.2024.149</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Temperature Dependence of the Residual Shear Strength: the Role of Clay Fraction
Popis výsledku v původním jazyce
The residual shear strength is a key parameter in slope stability. It can depend on temperature according to the material's composition and hydro-mechanical boundary conditions. However, landslide materials are often heterogeneous and anisotropic, and the role of thermo-mechanical coupling in their behaviour remains poorly understood. We conducted ring-shear experiments on landslide soil samples from the Melamchi catchment in central Nepal, where a large-scale disaster occurred in 2021. We tested water-saturated specimens under normal stresses of 50-150 kPa and a rate of shearing of 0.1 mm/min. After attaining the residual shear condition, we increased the temperature to 50 °C to evaluate a new steady-state value of shear resistance. We explored the role of the clay fraction by progressively removing the coarsest particles according to different cutoff sizes (125, 62, and 20 μm). We observed thermal sensitivity - and, in particular, weakening upon heating - only in specimens with a clay fraction higher than 10%. This finding is consistent with mechanisms of thermal sensitivity observed in fine-grained soils, which are related to physico-chemical interactions in clay minerals.
Název v anglickém jazyce
Temperature Dependence of the Residual Shear Strength: the Role of Clay Fraction
Popis výsledku anglicky
The residual shear strength is a key parameter in slope stability. It can depend on temperature according to the material's composition and hydro-mechanical boundary conditions. However, landslide materials are often heterogeneous and anisotropic, and the role of thermo-mechanical coupling in their behaviour remains poorly understood. We conducted ring-shear experiments on landslide soil samples from the Melamchi catchment in central Nepal, where a large-scale disaster occurred in 2021. We tested water-saturated specimens under normal stresses of 50-150 kPa and a rate of shearing of 0.1 mm/min. After attaining the residual shear condition, we increased the temperature to 50 °C to evaluate a new steady-state value of shear resistance. We explored the role of the clay fraction by progressively removing the coarsest particles according to different cutoff sizes (125, 62, and 20 μm). We observed thermal sensitivity - and, in particular, weakening upon heating - only in specimens with a clay fraction higher than 10%. This finding is consistent with mechanisms of thermal sensitivity observed in fine-grained soils, which are related to physico-chemical interactions in clay minerals.
Klasifikace
Druh
O - Ostatní výsledky
CEP obor
—
OECD FORD obor
10505 - Geology
Návaznosti výsledku
Projekt
Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2024
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů