粒状体モデルによる弾性波の伝ぱとホプキンソン効果の検討

抄録

The technologies of the numerical analysis made remarkable progress to understand the geoscience phenomena. In these approaches, however, the subsurface has been modeled by a continuum medium and the finite difference method, finite element method or boundary element method is adopted to solve the governing equations. Therefore, it is hard to treat the discontinuous phenomena. We applied a granular model to represent the bedrock medium to handle this problem. In this paper, we introduced the normal and shear springs to connect particles in granular model and this leads the Poisson's ratio of the medium changeable. We simulated the elastic wave propagation phenomena and also the Hopkinson bar phenomena in the granular model. The simulation results show this approach is quite useful for analyzing the fracturing and/or discontinuity phenomena in the subsurface.