I am running a critical state soil model by MS Excel. For the tri-axial compression drained test, I just input the vertical stress increment for a substep while keeping horizontal stress constant. For the tri-axial extension drained test, I keep the vertical stress constant but increase the horizontal stress instead. This gives a well prediction compared to the results in the paper. In the paper, there are also the tri-axial undrained test results for both compression and extension. My question is how to input the model in MS excel to obtain prediction? My idea now is to run that model from the finite element program in couple analysis with undrained mode. To do that it might waste much time to deal with FEM. Is there the way to solve this?
using numerical interpolating methods. Now the method of fractal interpolating functions used powerfully in the problems of soil
Hi Mr Kaewanam,
Do you refer to tests, as well? The failure modes must be different in compression and tension, I assume. If grain size changes while drained, the cohesion may increase, which is beneficial, however it depends on the compression, also. Close to the peak, it is highly nonlinear, so an interpolation will be an issue, for this nonhomogenous deformation distribution.
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