砂の弾塑性挙動について

概要

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A Sand is such a complex material that is initiated dilatancy with loading and is largely influenced by stress histories. In the previous paper, an incremental stress-strain relationship was proposed which was given in terms of tensor considering the subsequent anisotropy of Sands. But it had a tendency to overestimate observed extensive dilatancy and it could not calculate stress strain behaviour of Sands under both unloading and reloading. So newly in this paper, an elasto-plastic stresss strain relationship (constitutive equation) is proposed considering a Sand as strain hardening material not only for shear but for compression, by adopting stress-dilatancy equation which is widely admitted in the field of soil engineering. And some stress path tests of Toyoura Sand are carried out for the verification of the proposed equation. As the results of the comparison of both obsreved and calculated values of the strains along with some stress paths subjected complex stress histories, it was acertained that the proposed equation estimates reasonably the elasto-plastic stress strain behaviour of Sands.
長崎大学工学部の論文