Abstract
The finite element method, in conjunction with elasto-plastic constitutive laws, is able to give accurate estimates of collapse loads in geotechnical problems. The mechanisms of failure produced by these analyses, however, are often diffuse and poorly defined, as compared with those assumed in classical limit analysis techniques. This paper describes two methods for improving their visualization. It is shown that by introducing a small degree of post-peak material softening into the constitutive law, a considerably more localized mechanism is achieved. In contrast to previous attempts to “trigger” mechanisms whereby select elements were weakened, all elements are given the same constitutive law in the present approach. A second method involves a re-gridding approach, together with the use of incremental displacements. In this approach, the displacement field is enhanced by interpolating between the nodal values.
Published Version
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