UDSM – Shotcrete model

19 February 2015

This user defined soil model, developed in cooperation with Graz University of Technology, will allow users to take into account time dependent strength and stiffness of concrete, strain hardening/ softening in compression and tension as well as creep and shrinkage. Most of the input parameters for the shotcrete model can be derived from standard uniaxial tension and compression tests. While the model was mainly developed to model the behaviour of shotcrete, it has also proven useful in applications related to soil improvements, for example jet grout columns.

In order to obtain the model, send your request to sales@plaxis.com. Support on the use of the shotcrete model is only provided for this DLL under the conditions of the PLAXIS VIP support service and Article 10 of the End-User Licence Agreement.

August 2017 - Remarks on the usage of the Shotcrete UDSM dll in PLAXIS 3D
In principle, the Shotcrete UDSM model model should also work in 3D conditions. We did not extensively test this model in PLAXIS 3D, at least not as extensively as in PLAXIS 2D.
We have seen a particular 3D case (similar to this one) in which we noticed that the results suffer from some mesh dependency. It appears that the techniques used in the user defined soil model to overcome mesh size differences (regularization techniques) do not work as expected for 3D. But we found this only for this specific example and currently investigating why it goes wrong and what we can do to improve this.
When using the Shotcrete UDSM, please be critical of the results and do a sensitivity study on the mesh coarseness of the volumes using the shotcrete model.

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