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We present a study of the microstructural rôle of contact interactions in a rock filled gabion, based on some numerical tests. The gabion is a granular material, made of large stones with respect to its characteristic overall measure, wrapped by a steel wire mesh. In the framework of the theory of continua with microstructure, a model was put forward for such systems where the set of contacts around...
We present a micro-mechanical continuum model used for the description of dilatant granular materials with incompressible rotating grains for which the kinetic energy, in addition to the usual translational one, consists of other two terms owing to microstructural motions: in particular, it includes the dilatational expansions and contractions of the granules relative to one another, as well as the...
The object of this paper is the formulation of a new isotropic yield criterion for pressure dependent materials. The main features of the proposed formulation are: (1) variation of the deviatoric profile of the surface with the stress ratio, (2) presence of an embedded tensile cut-off, and (3) high flexibility in shape. Due to the number of parameters of the function, a simple automatic calibration...
High factors of safety and conservative methods are commonly used on foundation design on shelly carbonate soils. A better understanding of the behavior of this material is, thus, critical for more sustainable approaches for the design of a number of offshore structures and submarine pipelines. In particular, understanding the physical phenomena taking place at the microscale has the potential to...
A numerical investigation on the behavior of granular materials subjected to the rotation of principal stresses using the discrete element method is presented. A numerical procedure is developed to implement the two-dimensional arbitrary stress or strain paths imposed on polygonal specimens. Significant volumetric strain can be obtained and granular assembly appears to develop an anisotropic internal...
The flowability of granular materials is a crucial parameter to consider that impacts many engineering and industrial applications such as slope stability, powder handling and storage. The dependence of mechanical properties of granular materials on their water content is widely encountered but poorly understood. This paper presents a three-dimensional (3D) discrete element method model to simulate...
Within the field of soil mechanics a continuum assumption is generally adopted in order to avoid the complications of modelling micro-mechanical behaviour. However, certain constitutive behaviour can only be explained by investigating particle level interactions. Numerical investigations, such as those using the Discrete Element Method (DEM) to model soil particles as clusters of spheres, have delivered...
The interaction between near-surface geology and seismic radiation determines the features of wave propagation in terms of path, amplification or damping of the seismic signal, which in certain cases might cause the so called site effect. Here, we consider the propagation of seismic waves in a geological site modeled as a granular material. The model equations have been integrated with null initial...
In comparison to the description of particle size and shape, the surface roughness, which mainly affects the inter-particle friction, is more difficult to measure and quantify. One difficulty arises from the variability between particles and the heterogeneity of roughness within one particle. In this study, optical interferometry, which has the advantage of non-contact measurements of the particle...
In this work, concrete is studied at meso-scale (aggregates, macro-pores and mortar matrix), where the local failure mechanisms are known to drive the macroscopic behaviour of the material. In order to highlight the impact of the mechanical and morphological properties of each phase (along with their interfaces), micro-concrete specimens are prepared with rather small dimensions compared to the size...
In this paper the effect of grain fragmentation of a cohesionless granular material on the change of microstructure quantities is investigated using a micropolar continuum model. To this end the change of the grain size distribution is related in a simplified manner to a reduction of the mean grain diameter, which enters the constitutive equation as the internal length. The additional densification...
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