Abstract
Sandstone, limestone, slate with the diameter of 50 mm are used to simulate ball-ball contact of coarse-grained soil under the joint action of normal and tangential force by employing Rock Rheological Testing System. Breakage modes of particles, Elastic Core, tangential force-displacement curve are occupied to analyze the influence of breakage characteristics of particles by considering the material properties and the normal force percentage. Through the experimental study, it was discovered that contact point was eroded under the normal force, and the failures of particles depended on normal and tangential force. Particles were easier to break into more pieces and quality ratio was closer to 1 under larger normal force percentage. The top area and the depth of Elastic Core is proportional to the normal force percentage. For every 10% increase in normal force, the tangential force and tangential displacement are reduced by 20% and 10%, respectively. The tangential stiffness increases linearly with the normal force percentage. This paper studies particle breakage characteristics of coarse-grained soil from particle contact perspective, which lights up a new way to study the particle breakage of coarse-grained soil, and can also be expected to provide contact mechanical parameters for discrete element numerical simulation.
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Zhou, J., Zhang, Yw., Ouyang, Gb., Zhao, C. (2018). Experimental Study on Particle Breakage Characteristics of Coarse-Grained Soil Under Normal and Tangential Force. In: Zhou, A., Tao, J., Gu, X., Hu, L. (eds) Proceedings of GeoShanghai 2018 International Conference: Fundamentals of Soil Behaviours. GSIC 2018. Springer, Singapore. https://doi.org/10.1007/978-981-13-0125-4_84
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DOI: https://doi.org/10.1007/978-981-13-0125-4_84
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