Thermal and Shear-Rate Effects in Landslides: From the Classics to the Future

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F24%3A10488840" target="_blank" >RIV/00216208:11310/24:10488840 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1007/978-981-99-9057-3_6" target="_blank" >https://doi.org/10.1007/978-981-99-9057-3_6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/978-981-99-9057-3_6" target="_blank" >10.1007/978-981-99-9057-3_6</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal and Shear-Rate Effects in Landslides: From the Classics to the Future

Popis výsledku v původním jazyce

The frictional resistance of geomaterials upon localized shearing has been shown to depend on the rate of shearing. Both weakening and strengthening phenomena have been observed, and mechanisms have been proposed which take the mineralogy and stress level into account. Evidence also exists that temperature plays an important role in defining the frictional resistance as well as its dependence on the shear rate. Temperature and rate-dependent mechanisms can indeed control landslide runouts, yielding runaway sliding or prolonged slow creep displacements. We reviewed the classic literature on the matter and noted that, while studies on shear-rate effects are abundant, systematic classifications useful in predicting landslide fates in a variety of lithologies and environments are lacking. As for thermal effects, these are well studied with respect to large and fast-runout landslides, where frictional heating plays a major role. Conversely, little is known about changes in slope stability (prior to failure, remobilization, or reactivation) in relation to changes in ground temperature caused by varying boundary conditions, such as changes in groundwater temperature or heat transfer from the surface under seasonal or long-term climatic changes. Results of our preliminary experiments, targeting clay-rich materials, demonstrate an important effect of temperature on the residual shear strength, which is coupled with changes in shear-rate response. Catchment-scale statistical analyses also reveal that surface temperature can be correlated with landslide activity in space and time. We conclude by suggesting that landslide modelling approaches in the future should account for thermal and shear-rate effects. In physically-based modelling, this may be achieved via coupled thermo-hydro-mechanical formulations, in which the constitutive model includes a time-dependent (e.g., thermo-viscous) component.

Název v anglickém jazyce

Thermal and Shear-Rate Effects in Landslides: From the Classics to the Future

Popis výsledku anglicky

The frictional resistance of geomaterials upon localized shearing has been shown to depend on the rate of shearing. Both weakening and strengthening phenomena have been observed, and mechanisms have been proposed which take the mineralogy and stress level into account. Evidence also exists that temperature plays an important role in defining the frictional resistance as well as its dependence on the shear rate. Temperature and rate-dependent mechanisms can indeed control landslide runouts, yielding runaway sliding or prolonged slow creep displacements. We reviewed the classic literature on the matter and noted that, while studies on shear-rate effects are abundant, systematic classifications useful in predicting landslide fates in a variety of lithologies and environments are lacking. As for thermal effects, these are well studied with respect to large and fast-runout landslides, where frictional heating plays a major role. Conversely, little is known about changes in slope stability (prior to failure, remobilization, or reactivation) in relation to changes in ground temperature caused by varying boundary conditions, such as changes in groundwater temperature or heat transfer from the surface under seasonal or long-term climatic changes. Results of our preliminary experiments, targeting clay-rich materials, demonstrate an important effect of temperature on the residual shear strength, which is coupled with changes in shear-rate response. Catchment-scale statistical analyses also reveal that surface temperature can be correlated with landslide activity in space and time. We conclude by suggesting that landslide modelling approaches in the future should account for thermal and shear-rate effects. In physically-based modelling, this may be achieved via coupled thermo-hydro-mechanical formulations, in which the constitutive model includes a time-dependent (e.g., thermo-viscous) component.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10505 - Geology

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)

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název statě ve sborníku

Engineering Geology for a Habitable Earth: IAEG XIV Congress 2023 Proceedings Vol. 1, Chengdu, China

ISBN

978-981-9990-56-6

ISSN

1863-5520

e-ISSN

1863-5539

Počet stran výsledku

12

Strana od-do

71-82

Název nakladatele

Springer Nature

Místo vydání

Cham

Místo konání akce

Chengdu, China

Datum konání akce

21. 9. 2023

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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