Ram Gopisetti
Ansys Employee

Hi @Puhan , As you specified Rock as material which is brittle in nature, you first need to model the material using any of the following law , Look into literature first and gather the requried models and their values. (compression strenghts are very important )

And answering to your question, yes we can apply pressures which can be controlled via step loading and this step can be last for 1 sec to your specified time. I hope you should take advantage of Structures Engineering Courses available for free of cost in the following link

While you research, check this white paper on the modelling the rock via FEA

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comment down your response, cheers Ram