Abstract
This study provides some insights into the micro-slip behaviour of geological materials. The micromechanical experiments are conducted using a custom-built grain-scale apparatus on Leighton buzzard sand (LBS), which is a soil of relatively smooth and stiff grains, and completely decomposed volcanic (CDV) granules, which is a material composed of very rough and soft grains. It was observed that the CDV granules show more pronounced initial soft behaviour during normal loading, which might be due to their low apparent Young’s modulus and very high roughness. The results show that the micro-slip behaviour during inter-particle shearing can be related to the tangential stiffness degradation; this degradation is a function of the applied normal force, the surface roughness and the apparent Young’s modulus.
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Acknowledgments
The authors acknowledge the grants from the Research Grants Council of the Hong Kong Special Administrative Region, China, Project No. T22-603/15 N (CityU 8779012)) and Project No. 9042491 (CityU 11206617).
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Sandeep, C.S., Senetakis, K. (2018). An Experimental Study on the Tangential Contact Behaviour of Soil Interfaces. In: Giovine, P., Mariano, P., Mortara, G. (eds) Micro to MACRO Mathematical Modelling in Soil Mechanics. Trends in Mathematics. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-99474-1_31
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DOI: https://doi.org/10.1007/978-3-319-99474-1_31
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