Influence of temperature on the residual shear strength of landslide soil: role of the clay fraction

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F25%3A00637665" target="_blank" >RIV/67985891:_____/25:00637665 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/25:10499889

Výsledek na webu

<a href="https://doi.org/10.1007/s10064-025-04405-w" target="_blank" >https://doi.org/10.1007/s10064-025-04405-w</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10064-025-04405-w" target="_blank" >10.1007/s10064-025-04405-w</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Influence of temperature on the residual shear strength of landslide soil: role of the clay fraction

Popis výsledku v původním jazyce

The occurrence and fate of landslides are, among other factors, controlled by the shear strength of the materials involved and by how this strength changes during the landslide process. Temperature affects the strength of pure clays according to their mineralogy, stress history, and hydro-mechanical boundary conditions. However, natural soils often consist of heterogeneous mixtures of various clay and non-clay minerals. The effect of temperature on the residual shear strength of low-plasticity soils, in particular, remains poorly understood. To address this gap, ring-shear experiments were conducted on remoulded soil samples from a landslide-prone portion of the Melamchi Catchment in Nepal. The tests were performed in water-saturated conditions under representative normal stresses (50, 100, 150 kPa) and a constant rate of shearing (0.1 mm/min). Specimens with clay fractions ranging from 10 to 24% were subjected to heating-cooling cycles (20-50-20 degrees C) after attaining the residual shear condition. The results were analysed statistically, and a t-test was implemented to discern possible thermal effects from the experimental noise. A decrease in residual friction angle by up to 1 degrees upon heating (thermal weakening) was seen in specimens richer in clay under larger normal stresses. However, the effect was non-significant in many cases, suggesting a minor role of thermo-mechanical coupling in shear zones of slow-moving landslides. Further research encompassing a wider range of soil compositions is warranted to better quantify the influence of temperature on the shear strength of landslide soils.

Název v anglickém jazyce

Influence of temperature on the residual shear strength of landslide soil: role of the clay fraction

Popis výsledku anglicky

The occurrence and fate of landslides are, among other factors, controlled by the shear strength of the materials involved and by how this strength changes during the landslide process. Temperature affects the strength of pure clays according to their mineralogy, stress history, and hydro-mechanical boundary conditions. However, natural soils often consist of heterogeneous mixtures of various clay and non-clay minerals. The effect of temperature on the residual shear strength of low-plasticity soils, in particular, remains poorly understood. To address this gap, ring-shear experiments were conducted on remoulded soil samples from a landslide-prone portion of the Melamchi Catchment in Nepal. The tests were performed in water-saturated conditions under representative normal stresses (50, 100, 150 kPa) and a constant rate of shearing (0.1 mm/min). Specimens with clay fractions ranging from 10 to 24% were subjected to heating-cooling cycles (20-50-20 degrees C) after attaining the residual shear condition. The results were analysed statistically, and a t-test was implemented to discern possible thermal effects from the experimental noise. A decrease in residual friction angle by up to 1 degrees upon heating (thermal weakening) was seen in specimens richer in clay under larger normal stresses. However, the effect was non-significant in many cases, suggesting a minor role of thermo-mechanical coupling in shear zones of slow-moving landslides. Further research encompassing a wider range of soil compositions is warranted to better quantify the influence of temperature on the shear strength of landslide soils.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/LL2316" target="_blank" >LL2316: Teplotně podmíněná nestabilita svahů při změně klimatu</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Bulletin of Engineering Geology and the Environment

ISSN

1435-9529

e-ISSN

1435-9537

Svazek periodika

84

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

20

Strana od-do

394

Kód UT WoS článku

001526105400001

EID výsledku v databázi Scopus

2-s2.0-105010152846