Energy Dissipation and Rheological Characterization of Sand-Clay Mixtures
DOI:
https://doi.org/10.64862/Keywords:
rheology, energy dissipation, geophysical flowsAbstract
Geophysical flows-such as floods, mudflows, and debris flows- display increasingly complex rheological behaviour as solid fraction rises, greatly impacting hazard assessment and mitigation. While prior research concentrated on monotonic shearing of two-phase flows, the detailed mechanisms governing energy dissipation during shear deformation remain unclear This study systematically explores rheological transitions in sand-clay-water mixtures subjected to oscillatory shear using parallel plate rheometer, quantifying elastic, viscous and plastic energy contributions. The results demonstrate that rising clay content promotes a transition from elastic to viscous stress dominance and enhances shear-thinning behaviour.
References
Bhatta A. (2025). Investigation of two-phase flow rheology and impact against dual barriers. [Ph.D. Dissertation] The Hong Kong University of Science and Technology, Hong Kong SAR, China.
Ettehadi A., Tezcan M. and Altun G. (2020). Rheological behavior of water-clay suspensions under large amplitude oscillatory shear. Rheological Acta 59, No. 9, 665-683p. https://doi.org/10.1007/s00397-020-01221-9
Iverson R. M. (1997). The physics of debris flows. Revies of Geophysics 35, No. 3, 245-296p. https://doi.org/10.1029/97RG00426
Mezger T. (2020). The rheology handbook: for users of rotational and oscillatory rheometers. European Coatings
Ng C.W.W., Bhatta A., Choi C.E., Poudyal S., Liu H., Cheung R.W.M., and Kwan J.S.H. (2024). Effects of debris flow rheology on overflow and impact dynamics against dual-rigid barriers. Géotechnique, 74, No. 12, 1172–1185p. https://doi.org/10.1680/jgeot.21.00226
Pudasaini S.P. (2020). A full description of generalized drag in mixture mass flows. Engineering Geology 265, 105429. https://doi.org/10.1016/j.enggeo.2019.105429
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