Effect of hydraulic and mechanical characteristics of sediment layers on water film formation in submarine landslides
| Autor: | Daisuke Asahina, Hinako Hosono, Takato Takemura, Keiji Kitajima, Shogo Kawakita |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
010502 geochemistry & geophysics 01 natural sciences law.invention Tensile strength Pore water pressure Submarine landslides law Ultimate tensile strength Geotechnical engineering 0105 earth and related environmental sciences Hydrogeology lcsh:QE1-996.5 lcsh:Geography. Anthropology. Recreation Overburden pressure Cementation (geology) Water film Pore pressure lcsh:Geology Portland cement Permeability (earth sciences) lcsh:G General Earth and Planetary Sciences Layer interface Geology Submarine landslide |
| Zdroj: | Progress in Earth and Planetary Science, Vol 7, Iss 1, Pp 1-12 (2020) |
| ISSN: | 2197-4284 |
| DOI: | 10.1186/s40645-020-00375-7 |
| Popis: | Through two lab-scale experiments, we investigated the hydraulic and mechanical characteristics of sediment layers during water film formation, induced by elevated pore pressure—considered one of the triggers of submarine landslides. These involved (1) sandbox experiments to prove the effect of water films on mass movement in low slope gradients and (2) experiments to observe the effect of the tensile strength of semi-consolidated sediment layers on water film formation. Portland cement was used to mimic the degree of sediment cementation. We observed a clear relationship between the amount of cement and pore pressure during water film formation; pressure evolution and sediment deformation demonstrated the hydraulic and mechanical characteristics. Based on the results of these experiments, conditions of the sediment layers during water film formation are discussed in terms of pore pressure, permeability, tensile strength, overburden pressure, and tectonic stresses. The results indicate that the tensile strength of the sediment interface provides critical information on the lower limit of the water film formation depth, which is related to the scale of potential submarine landslides. |
| Databáze: | OpenAIRE |
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