Energy Dissipation and Rheological Characterization of Sand-Clay Mixtures

Aastha Bhatta; Sunil Poudyal; Qi Zhang; Charles Wang Wai Ng

doi:10.64862/ajeg.2025.2sp.97.235

Energy Dissipation and Rheological Characterization of Sand-Clay Mixtures

Authors

Aastha Bhatta Department of Electricity Development, Ministry of Energy, Water Resources and Irrigation, Sano Gaucharan, Kathmandu, Nepal Author
Sunil Poudyal Department of Civil and Environment Engineering, The Hong Kong University of Science and Technology, Hong Kong SAR, China Author
Qi Zhang Department of Civil and Environment Engineering, The Hong Kong University of Science and Technology, Hong Kong SAR, China Author
Charles Wang Wai Ng Department of Civil and Environment Engineering, The Hong Kong University of Science and Technology, Hong Kong SAR, China Author

DOI:

https://doi.org/10.64862/ajeg.2025.2sp.97.235

Keywords:

Rheology, Energy dissipation, Geophysical flows

Abstract

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(9), 665-683. https://doi.org/10.1007/s00397-020-01221-9

Iverson, R. M. (1997). The physics of debris flows. Reviews of Geophysics, 35(3), 245-296. https://doi.org/10.1029/97RG00426

Mezger, T. (2020). The Rheology Handbook: For users of rotational and oscillatory rheometers. Vincentz Network (European Coatings). https://doi.org/10.1515/9783748603702

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(12), 1172–1185. 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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Published

2025-11-27

Issue

Vol. 2 No. Sp Issue (2025): Extended Abstract Volume of the ARC-15 of IAEG, Asian Journal of Engineering Geology

Section

ARC15 Extended Abstract

License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

Energy Dissipation and Rheological Characterization of Sand-Clay Mixtures. (2025). Asian Journal of Engineering Geology, 2(Sp Issue), 207-208. https://doi.org/10.64862/ajeg.2025.2sp.97.235