I am a PhD student in Zhejiang University. Recently, I have been working on the simulation of a braced excavation with Abaqus. I want to simulate the soil with the sand hypoplasticity model provided by Prof. Masin. However, because I am a new user of Abaqus and the advanced sand hypoplasticity model, I have encountered many questions during this work. My questions are as follows. Any suggestion or comment will be appreciated.
(1) When I use the umat.for file downloaded from https://soilmodels.com/download/plaxis-umat-hypoplas-zip to simulate an excavation in granular soils with Abaqus, I encountered the problem “ERROR in job messaging system: Error in connection to analysis”. The calculation was not forwarded, but ended with “Job test-1 completed successfully.”. Could you please tell me what is the possible reason for this problem?
(2) When using the umat. for file, it is needed to input the number of solution-dependent state variables in Abaqus. But I don’t know the number. So, my question is how many state variables have been used in the umat.for file?
(3) How to set the initial values for these state variables?sand hypoplasticity