Experimental evidence for shallow, slow-moving landslides activated by a decrease in ground temperature
| Autor: | Sumio Matsuura, Tatsuya Shibasaki, Takashi Okamoto |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010504 meteorology & atmospheric sciences
0211 other engineering and technologies Landslide 02 engineering and technology Slip (materials science) 01 natural sciences Instability Residual strength Geophysics Shear (geology) Rheology Soil water General Earth and Planetary Sciences Geotechnical engineering Clay minerals Geology 021101 geological & geomatics engineering 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Research Letters. 43:6975-6984 |
| ISSN: | 0094-8276 |
| Popis: | In order to understand the trigger mechanism of slow-moving landslides occurring in the early cold season from late autumn to winter, we investigated the effect of temperature on the shear strength of slip surface soils. Displacement-controlled and shear stress-controlled box shear experiments were performed on undisturbed slip zone soils under residual strength conditions. Test results conducted at temperatures from 9 to 25°C showed remarkable shear strength reductions with decreasing temperature. Creep-like slow shear displacements were induced by a decrease in temperature. These temperature-dependent shear behaviors are attributed to the rheological properties of hydrous smectite that dominantly compose the soil material along the failure surface. Our experimental results imply that ground temperature conditions influence slope instability, especially for shallow landslides occurring in smectite-bearing rock areas. |
| Databáze: | OpenAIRE |
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