Bifurcations and Instabilities in Geomechanics: Proceedings by J.F. Labuz, A. Drescher

By J.F. Labuz, A. Drescher

This ebook includes a sampling of papers provided on the June 2-5, 2002 overseas Workshop on Bifurcations andamp; Instabilities in Geomechanics (IWBI 2002). The scope of the Workshop comprises analytical techniques, numerical tools, and experimental recommendations.

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Additional info for Bifurcations and Instabilities in Geomechanics: Proceedings of the International Workshop, IWBI 2002, Minneapolis, Minnesota, 2-5 June 2002

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Hopefully, the perturbations will automatically lead to the branch, which is statistically preferable. This, at least partly, resembles the choice of a branch in a real physical system that is influenced by random factors. Note that the latter present the only reason, which leads to a particular branch in an absolutely symmetric system such as the Euler’s column under the critical load. Numerical experiments, which simulate localization in systems with many elements in a plastic state, may serve to illustrate the approach (e.

La) gives way to localized deformation in a narrow planar zone (Fig. 1b). Deformation in the zone is a combination of shear and dilation or compression relative to the plane of the band. The orientation of the band varies with rock type and the confining (lateral) stress but typically makes an angle of about 30° with the direction of the axial compressive stress. Figure 1. Schematic illustration of the formation of a shear band (b) following homogeneous deformation (a) in the axisymmetric compression test.

2001). , Lisse, The Netherlands uniform properties. Although the micromechanical mechanisms of deformation are different in these various materials, similar phenomenological constitutive relations can be used to describe them (Gu et al. 2001). Thus, understanding the conditions for the occurrence of compaction bands is relevant to a variety of materials and technological processes. This paper describes in more detail the nature of compaction bands in geomaterials, recent observations of them in laboratory experiments and analyses for their formation.

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