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Influence of heterogeneity on rock strength and stiffness using discrete element method and parallel bond model

Journal of Rock Mechanics and Geotechnical Engineering 2017年第4期9卷 575-584页

作者： spyridon liakas Catherine O’Sullivan Charalampos Saroglou Arup Geotechnics Solihull UK Department of Civil & Environmental Engineering Imperial College London London UK Department of Geotechnical Engineering School of Civil Engineering National Technical University Athens Athens Greece

The particulate discrete element method(DEM) can be employed to capture the response of rock,provided that appropriate bonding models are used to cement the particles to each *** of laboratory tests are important to establish the extent to which those models can capture realistic rock *** the focus in such comparison studies has either been on homogeneous specimens or use of two-dimensional(2D) *** situ rock formations are often heterogeneous,thus exploring the ability of this type of models to capture heterogeneous material behavior is important to facilitate their use in design *** situ stress states are basically three-dimensional(3D),and therefore it is important to develop 3D models for this *** paper revisits an earlier experimental study on heterogeneous specimens,of which the relative proportions of weaker material(siltstone) and stronger,harder material(sandstone) were varied in a controlled *** a 3D DEM model with the parallel bond model,virtual heterogeneous specimens were *** overall responses in terms of variations in strength and stiffness with different percentages of weaker material(siltstone) were shown to agree with the experimental *** was also a good qualitative agreement in the failure patterns observed in the experiments and the simulations,suggesting that the DEM data enabled analysis of the initiation of localizations and micro fractures in the specimens.

关键词： Discrete element method(DEM) Heterogeneous rocks Strength and stiffness Parallel bond model

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