Temperature Dependence of the Residual Shear Strength: the Role of Clay Fraction
The result's identifiers
Result code in 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>
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Temperature Dependence of the Residual Shear Strength: the Role of Clay Fraction
Original language description
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.
Czech name
—
Czech description
—
Classification
Type
O - Miscellaneous
CEP classification
—
OECD FORD branch
10505 - Geology
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
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
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů