Abstract
Debris flows are a type of fast landslides where a mixture of soil and water propagates along narrow channels. The main characteristics are (1) important relative displacements between the solid and fluid phases, and (2) development of pore-water pressures in excess to hydrostatic. The ratios between vertical and horizontal displacements of the flow, from the triggering point to the deposition, indicate that friction angles are much smaller than those measured in laboratories. Debris flows are modeled as two phases flow, but implementing pore-water pressure is an important issue. The purpose of this paper is to improve the existing two phases debris flow models by implementing pore-water pressures in excess to hydrostatic. It is found that pore pressure evolution depends on consolidation, changes in the flow depth, and changes and gradients of porosity. The proposed depth integrated mathematical model is discretized using two sets of SPH nodes (solid and fluid), with a set of finite difference meshes associated with each solid material SPH point. The paper presents two examples from where it is possible to gain insight into the differences between the models (with and without excess pore water pressure).
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Acknowledgements
The authors gratefully acknowledge the economic support provided by the Spanish Ministry MINECO under project ALAS (BIA2016-76253-P). In addition, the authors gratefully acknowledge the support of the Geotechnical Engineering Office, Civil Engineering and Development Department of the Government of the Hong Kong SAR in the provision of the digital terrain models for the Hong Kong landslide case.
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Pastor, M., Tayyebi, S.M., Stickle, M.M. et al. A depth integrated, coupled, two-phase model for debris flow propagation. Acta Geotech. 16, 2409–2433 (2021). https://doi.org/10.1007/s11440-020-01114-4
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DOI: https://doi.org/10.1007/s11440-020-01114-4