Since the pressures are higher than those reported by the FLAC analysis, I consider the analysis to be conservative RE: 310 feet of 137. In the interim until I can get a fully inelastic soil model that I am comfortable with, I will run scenarios with the partially elastic model that I have currently working. Ultimately, this results in higher pressures than predicted by the FLAC analysis. Accepted 5 April 2007 KEY WORDS: box culverts embankment finite element. I do get a full solution from GEO5 when the soil directly surrounding the boxes is modelled elastically. The possibility of reducing earth pressure on deeply buried concrete box. I have been trying multiple scenarios (different meshes, soil properties, heights of soil layers) to get the models to converge to a solution but have been unsuccessful to get a full solution from a fully inelastic soil model. Furthermore, the Mohr-Coulomb soil as it is modelled in GEO5 creates instabilities in the model (the model fails to converge to a solution). GEO5 currently only has the capability of an elastic – perfectly plastic soil (Mohr-Coulomb).The current report highlights as well as some of the literature highlights the limitations of the Mohr-Coulomb soil model. FLAC uses model of the soil that uses a hyperbolic relationship between stress and strain for the soil.
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