Elastoplastic finite element analysis of ground deformation behavior due to uplifting of anchor

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  • ４．非線形力学　　アンカー引抜時の地盤の変形挙動に関する弾塑性有限要素解析

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Finite element method in which the subloading surface model falling within the unconventional plasticity was introduced is applied for analyzing anchor uplift problem in shallow sand layer. In order to clarify the features of the present finite element program the influences of material constant u controlling intensity of the plastic deformatio inside the yield surface and the initial value of yield surface F0 are examined choosing their values in several levels. The ultimate uplift resistance grows with increase of u and/or F0.Further, the inclination of shear band reduces with increasing of Fo since the dilatancy gradually becomes large following the increase of F0 On the other hand, the present finite element method is evaluated by comparing with experimental data after Sakai and Tanaka (1998) and their numerical results. The present numerical results agree well with their experimental data. Especially, the progressive failure phenomena in the post-peak process of uplift resistance could be described appropriately in the present finite element simulations.

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