主讲人简介：
Dr. François Nicot is currently Professor at Université Savoie Mont Blanc (Lab. EDYTEM). He received his Engineer and PhD degrees in civil engineering on 1995 and 1999, respectively, at Centrale School of Lyon (France). As a world-renowned researcher in soil mechanics, his activities deal with geomechanics, with a special focus on micromechanics of granular materials and multiscale failure modeling. He has published more than 200 articles and more than 20 collective books.He is deputy director of the International Research Network GeoMech and is currently Editor-in-Chief of the European Journal of Environmental and Civil Engineering, Associate Editor of Water Science and Engineering and Granular Matter.
内容简介：
Solving boundary value problems requires implementation of sufficiently robust constitutive models,most of which try to incorporate a great deal of phenomenological ingredients often leading to overcomplicated formulations with a large number of parameters. On the other hand, geomaterials are known to have an internal microstructure. Most macroscopic properties observed result from the microstructural arrangement of grains. Thus, the emergent complexity is not related to the constitutive description, but to the basic topological properties taking place on the microscopic scale. This presentation discusses and showcases recent discrete element simulation results. An advanced micromechanical model (3D-H model) is presented. It introduces an intermediate scale composed of a set of adjoining particles and can recover many constitutive properties observed on the macroscopic scale in a very natural way, such as the occurrence of diffuse versus localized failure modes. Some FEM results are presented to give clear insights into the capability of such multiscale approaches.