Počet záznamů: 1
Rate-dependency of residual shear strength of soils: implications for landslide evolution
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SYSNO ASEP 0572535 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Rate-dependency of residual shear strength of soils: implications for landslide evolution Tvůrce(i) Duque, J. (CO)
Loche, Marco (USMH-B) ORCID, RID
Scaringi, G. (CZ)Celkový počet autorů 3 Zdroj.dok. Geotechnique Letters - ISSN 2049-825X
Roč. 13, č. 2 (2023), s. 105-112Poč.str. 8 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova landslide ; residual shear strength ; shear-rate effect ; velocity strengthening ; velocity weakening Obor OECD Environmental and geological engineering, geotechnics CEP SS02030023 GA TA ČR - Technologická agentura ČR Způsob publikování Omezený přístup Institucionální podpora USMH-B - RVO:67985891 UT WOS 000987679900001 EID SCOPUS 85160347537 DOI 10.1680/jgele.23.00004 Anotace Shear-rate weakening or strengthening behaviours can effectively control landslide runouts, defining sudden runaway sliding or years-long slow-creep phases. These behaviours are partly controlled by the properties of the basal material. Understanding its stress-strain-time response is crucial in physically-based assessments of landslide dynamics and the associated risk. We investigate the frictional resistance of a calcium bentonite, a kaolin and a quartz sand by means of a conventional ring-shear apparatus under normal stresses representative of landslide shear zones. Results for the fine-grained soils, in line with literature on pure clays, indicate important velocity strengthening, whereas small shear-rate effects were observed in sand. As long as effective stresses remain constant, a velocity strengthening response can exert a feedback that, under certain conditions, counteracts perturbations in boundary conditions and prevents fast runouts on pre-existing shear zones. Accordingly, we argue that specifically testing for shear-rate-dependency and incorporating observed behaviours in model formulations can be beneficial for better predicting landslide fates. Pracoviště Ústav struktury a mechaniky hornin Kontakt Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Rok sběru 2024 Elektronická adresa https://doi.org/10.1680/jgele.23.00004
Počet záznamů: 1