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![]() Thus the MC soil model is regarded as a perfectly elastic-perfectly plastic soil model or a bi-linear soil model. The Mohr-Coulomb (MC) soil model is an advancement on the LE soil model in that soil failure is accounted for according to the Mohr-Coulomb failure criterion i.e.Īn input of the cohesion strength c' and friction angle is required as PLAXIS recommends users to input drained parameters as opposed to undrained parameters. When applied to pile foundations, a LE soil model considerably over-estimates pile-to-pile interaction and thus can provide an overly-conservative estimate of pile group settlement. Thus a LE soil model should only be used for small strain response. A LE soil model should only be applied where users are confident that elastic soil conditions are present or where there is a sufficiently high Factor of Safety (FOS) against failure. The LE soil model is perfectly elastic and thus does not account for plastic displacements, therefore soil failure is not accounted for. The main input parameters are the Young's modulus of the soil and Poisson's ratio. The Linear Elastic (LE) soil model is the most basic and straightforward soil model. These limitations must then be considered in design or research and results should be put into context accordingly. PLAXIS users must always be aware of the various limitations associated with each soil model. ![]() It can be difficult to choose an appropriate soil model for a certain application. ![]()
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