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Resonant column experiments with fine-grained model material – evidence of particle surface forces

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Abstract

Resonant column experiments were conducted with an extremely fine-grained material, viz. an α-aluminum oxide (Al2O3), which serves as a model material for cohesive soils with particle diameters in the range of μm. With this particle size interparticle forces from van der Waals and Coulombic interaction have an influence on the behavior of the material in dynamic shear tests. By adjusting the surface charge, and hence the Coulombic repulsion, we obtain repulsive or attractive particles, which influences sample fabric and shear stiffness. From the increase of shear stiffness at small strain (γ≤10−6) with effective pressure we have estimated the net interparticle pressure from surface forces in the range of some kPa for a mean particle diameter of 0.8 μm. Our results show that the behavior of fine-grained granular materials at small shear strains cannot only be described by their density and stress state. Particle surface forces have to be taken into account.

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Authors and Affiliations

  1. Institute of Soil Mechanics and Rock Mechanics, University of Karlsruhe, 76128, Karlsruhe, Germany

    S. Richter & G. Huber

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  1. S. Richter
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  2. G. Huber
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Correspondence to S. Richter.

Additional information

The study described in this paper was sponsored by the German Research Council (DFG), Research Group FOR 371-2. The support is gratefully appreciated.

We would like to thank Professor Gudehus for his valuable advice and many stimulating discussions.

The KSEM micrograph and the grain size distribution data have been provided by the Institute of Ceramics in Mechanical Engineering, University of Karlsruhe (Research Group FOR 371, German Research Council, DFG). We would like to thank for cooperation and support.

We thank the Institute for Technical Chemistry, Research Center Karlsruhe for providing the ESEM micrograph.

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Richter, S., Huber, G. Resonant column experiments with fine-grained model material – evidence of particle surface forces. GM 5, 121–128 (2003). https://doi.org/10.1007/s10035-003-0144-8

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  • DOI: https://doi.org/10.1007/s10035-003-0144-8

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