Diverse shear behaviors of clayey materials: Implications for differing landsliding behaviors within the same area in Niigata, Japan

Wang, Gonghui; Watanabe, Naoharu; Hoshikawa, Keigo; Furuya, Gen; Cai, Fei; Wu, Shengshan

doi:10.1016/j.enggeo.2022.106932

Cited by 12 publications

(2 citation statements)

References 79 publications

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“…The sample with hardly any clay, on the other hand, shows a rate-and-state frictional behavior of an immediate strength drop and a following fast recovery to the slow-residual state. The same behavior has been reported in other studies (Agliardi et al, 2020;Scaringi et al, 2018;Wang et al, 2023).…”

Section: Comparison To Other Landslidessupporting

confidence: 90%

“…Although these are classified as granular soils, neutral rate effects cannot be assumed a priori for their residual strength, because of their non‐negligible clay content. In fact, various studies have demonstrated both positive and negative rate effects for such soils, depending on the shearing rates and the clay content (Kang et al., 2022; Scaringi & Di Maio, 2016; Scaringi et al., 2018; Tika et al., 1996; Wang et al., 2023). The problem with alpine soils, which are silty sands, is not only that their rate effects are less pronounced and understood, but also that their clay content (>5%) makes the understanding of rate effects even more complicated, but nevertheless critical for the risk assessment of these landslides.…”

Section: Introductionmentioning

confidence: 99%

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Rate, Water Pressure, and Temperature Effects in Landslide Shear Zones

Kohler,

Hottiger,

Puzrin

2023

JGR Earth Surface

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The behaviour of slow‐moving landslides is controlled by the residual strength of the shear zone. Despite their mobile state, such slides can often withstand extreme events like heavy rainfalls and earthquakes. A rate‐hardening in the shear zone is suspected to be one of the main stabilizing factors and has been well investigated, in particular for clayey soils. Soils from steep alpine landslides, on the other hand, are often dominated by silts and sands with various clay content, and while understanding of their rate dependency is less advanced, it remains critical for the reliable risk assessment. In this article, an improved ring shear apparatus is presented and applied to investigate rate, pore water pressure and temperature effects in landslide shear zones. The testing program on samples from two alpine landslides in Switzerland reveals a moderately positive rate effect explaining their mobile state. An achieved insight into the thermo‐hydro‐mechanical processes of fast shearing provides physical evidence to the widely debated hypothesis on generation of excess pore water pressure due to frictional heating. However, for the tested materials this effect only occurs after extended shearing and does not lead to a complete loss of shear strength. Based on that and the observed positive rate effects, catastrophic failure seems unlikely for these landslides. At the same time, the results suggest that for less permeable soils, frictional heating may indeed be a source of negative rate effect during very rapid shearing.

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Section: Comparison To Other Landslidessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Rate, Water Pressure, and Temperature Effects in Landslide Shear Zones

Kohler,

Hottiger,

Puzrin

2023

JGR Earth Surface

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Mechanism of enhanced mobility of glacial debris flows induced by ice and rock avalanches in southeast Tibet, China: Insights from impact loading tests

Jiang,

Lu,

Wang

et al. 2024

Earth Surf Processes Landf

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Glacial debris flows, which are induced by ice and rock avalanches, pose an increasing threat to human life and critical infrastructure under climate change. Therefore, the movement characteristics of debris flows induced by ice and rock avalanches have attracted increasing attention, but the understanding of the effects of ice and rock avalanches on the mechanism of debris flow mobility remains incomplete. To study the mechanisms of the enhanced mobility of debris flows and simulate the impacts of ice and rock avalanches, we employed a servo‐hydraulic‐controlled ring–shear apparatus to examine the undrained shear behaviour of moraine material under monotonic and impact loading conditions. It is found that impact loading caused a significant reduction in the shear strength of moraine, with the mobilized friction angle decreasing by 16.1% (from 20.6 to 17.3°) and the residual angle of internal friction decreasing by 52.9% (from 7.0 to 3.3°). After moraine failure (at the peak shear strength), the moraine material exhibited rapid shear strength reduction behaviour under impact loading conditions owing to the lower strength weakening coefficient and smaller slip‐weakening distance. Compared with the monotonic loading ring–shear test results, the liquefaction potential was greater, and the shear energy needed to reach the same pore water pressure ratio and ultimate pore water pressure was much lower under impact loading. This suggests that under impact loading, moraine is more susceptible to liquefaction and exhibits mobility characteristics. Our results provide new insights and increase the understanding of the mechanism underlying the enhanced mobility of glacial debris flows induced by ice and rock avalanches.

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Mobility forecast of gravel-silty clay landslide using ring shear test and discrete element method in Shaziba, southwestern Hubei Province, China

Sheng,

Zhang,

et al. 2024

Bull Eng Geol Environ

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Diverse shear behaviors of clayey materials: Implications for differing landsliding behaviors within the same area in Niigata, Japan

Cited by 12 publications

References 79 publications

Rate, Water Pressure, and Temperature Effects in Landslide Shear Zones

Rate, Water Pressure, and Temperature Effects in Landslide Shear Zones

Mechanism of enhanced mobility of glacial debris flows induced by ice and rock avalanches in southeast Tibet, China: Insights from impact loading tests

Mobility forecast of gravel-silty clay landslide using ring shear test and discrete element method in Shaziba, southwestern Hubei Province, China

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