Advanced Numerical Applications and Plasticity in by Vaughan D. Griffiths, Giancarlo Gioda

By Vaughan D. Griffiths, Giancarlo Gioda

Through the contributions of famous students, this booklet presents an up-to-date evaluation of a few suitable advancements and purposes during this quickly turning out to be box. subject matters comprise constitutive versions for geomaterials, numerical research of floor development innovations and tunnelling problems.

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Extra info for Advanced Numerical Applications and Plasticity in Geomechanics (CISM International Centre for Mechanical Sciences)

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Details of the finite element mesh. 2 Determination of the Material Parameters for the Non-Isotropic Model While the determination of the material constants to be used in the inhomogeneous analyses is straightforward, since they coincide with those of sand and reinforcements, a preliminary calculation is necessary to work out the shear strength parameters for the non-isotropic model. To this purpose, two plane strain analyses have been carried out, for the HAS and OPG cases, based on the inhomogeneous approach.

5m high vertical wall considering two alternative kinds of reinforcements. The first one consists of the assemblage of oriented polyethylene grids (OPG). The second reinforcement consists of high adherence steel strips (HAS). 75m, that corresponds to 10 reinforcement layers for the entire wall. A first set of finite element analyses of tllis structure was based on elastic and elasto-perfectly plastic behaviour for tl1e sand layers and t11e reinforcements, respectively. The analyses of both HAS and OPG cases were carried out using SoSIA (Soil Structure Interaction Analysis) finite element progran1 (Cividini and Gioda, 1992), adopting both 2D, plane strain, and 3D models.

1994 ). An application to the finite element analysis of a vertical earth wall is subsequently presented. In particular, two alternative approaches are comparatively evaluated. , 1997). g. Smith and Segrestin, 1992), the reinforced earth structure is discretised considering separately the reinforcements and the sand layers between them. g. , 1994). 1 Experimental Investigation and Modelling of the Laboratory Tests The ongoing experimental program includes axisymmetric triaxial and plane strain tests, aimed at evaluating the influence of the reinforcements on the overall load-displacement behaviour of the reinforced samples (Balduzzi and Milani, 1999; Luthi, 2000).

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