Abstract

The rheological behavior of soil–water mixtures can affect the flow dynamics of natural processes such as flow-type landslides and sediment transport. In this study, an experimental investigation was carried out on soil–water mixtures containing particles up to 0.425 mm with volumetric solid concentrations of 0.05CV0.35 using a wide-gap rotational viscometer, and the contributions of particle–fluid, collisional, and colloidal interactions to their rheological behavior were evaluated thoroughly. The torque-scaling method was applied to identify the flow regime and extract the effective rheological parameters from turbulent flows. A transition between dilute and concentrated mixtures can be identified based on their sediment type, CV, and the predominance of particle–fluid and interparticle interactions. For dilute mixtures (CV<0.250.28) the particle-fluid interaction is dominant. The colloidal interactions induce another force scale that is independent of the shear rate. Thus, the Bingham model can be applied to such mixtures (debris or mud flood). For concentrated mixtures (CV>0.250.28), the shear-thickening rheology can be applied for granular mixtures (debris flows), because the collisional interactions are dominant, whereas shear-thinning rheology can be applied for fine-grained mixtures (mudflows), because colloidal interactions are dominant.

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Data Availability Statement

Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.

Acknowledgments

The authors appreciate the financial support from the National Key R&D Program of China (2018YFC1508601), the NSFC/RGC Joint Research Scheme (Grant No. N_HKUST620/20), the Research Grants Council of the Hong Kong SAR (Grant No. 16205118) and the Joint Ph.D. Program Agreement between Hong Kong University of Science and Technology and Sharif University of Technology, Tehran, Iran.

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Go to Journal of Geotechnical and Geoenvironmental Engineering
Journal of Geotechnical and Geoenvironmental Engineering
Volume 148Issue 7July 2022

History

Received: Jan 13, 2022
Accepted: Apr 1, 2022
Published online: May 6, 2022
Published in print: Jul 1, 2022
Discussion open until: Oct 6, 2022

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Research Assistant, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Hong Kong; Ph.D. Candidate, Dept. of Civil Engineering, Sharif Univ. of Technology, Tehran 1458889694, Iran. ORCID: https://orcid.org/0000-0002-0986-9920. Email: [email protected]
Professor, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Hong Kong (corresponding author). ORCID: https://orcid.org/0000-0001-7208-5515. Email: [email protected]
Professor, Dept. of Civil Engineering, Sharif Univ. of Technology, Tehran 1458889694, Iran. ORCID: https://orcid.org/0000-0001-9296-5843. Email: [email protected]
Z. D. Xu, Ph.D. [email protected]
Research Assistant, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Hong Kong. Email: [email protected]
Research Assistant Professor, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Hong Kong. ORCID: https://orcid.org/0000-0003-4255-8267. Email: [email protected]

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  • Rheological behaviour of dilute soil-water mixtures: role of interactions from colloidal and non-colloidal particles, Canadian Geotechnical Journal, 10.1139/cgj-2021-0437, 60, 2, (139-150), (2023).

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