A constitutive model is developed within the framework of Perzyna’s viscoplasticity for predicting the stress-strain-time behaviour of soft porous rocks. The model is based on the hyperelasticity and multisurface viscoplasticity with hardening. A time-stepping algorithm is presented for integrating the creep sensitive law. An example of application to one-dimensional consolidation is presented....

From the 2000s onwards, unprecedented space missions have brought about a wealth of novel investigations on different aspects geomechanics. Such are related to exploratory activities such as drilling, sampling, coring, water extraction, anchoring, etc. So far, whole range constitutive research projects plate tectonics, morphology, volcanic and volatile content planetary bodies been implemented....

The paper is concerned with the derivation of failure criteria for anisotropic materials through a simple extension of the Mohr Coulomb failure criterion and embracing the critical plane concept. We revisit the classic problem of determining the macroscopic strength of a rock specimen with an initial structural anisotropy in relation to the directions of externally applied principal stresses. M...

We provide a brief overview of the Discrete Element Method (DEM) for modeling large frictional contact problems in granular flow dynamics and quasi-static geomechanics applications. In terms of contact, DEM can be divided into two approaches: the Constraint Method (CM) or rigid-body approach, and the Penalty Method (PM) or soft-body approach. We give a detailed presentation of a DEM-PM contact ...

Some of the most challenging problems in geomechanics involve the coupling between fluid flow and solid deformation. In this paper we briefly present an overview of existing coupling methods to problems involving fluid flow and deformation and describe testing of a new discrete-based coupling method for problems in porous media. Modeled permeability and porosity distributions are compared to id...