There are two principles which may be referred to as essentials to describing soil
and rock behavior. The mechanical behavior is associated to the law of conservation of linear
momentum, allowing forces balance analysis and the hydraulic behavior is characterized by
mass conservation. These phenomena are related: stress-strain state is affected by fluid
pressures and vice-versa. Therewith, it is intuitive the understanding of the importance of
coupled analyses, which are certainly a more precise manner of describing how mechanical
and hydraulic behavior are connected. Given certain difficulties related to the modeling
process, porous media numerical model representation is usually simplified. In certain cases,
simplifications do not imply on losses in results and behavior prediction. However, some
situations require more comprehensive approaches, with development of previously neglected
conditions. The main objective of this paper is to present a formulation for fully coupled
hydro-mechanical analyses considering fluid and solids compressibility. This formulation,
implemented in Finite Element program ALLFINE [1,2,3], was tested for a one-dimensional
consolidation case. A sensitivity analyses for the fluid compressibility parameter using
modified Cam-clay constitutive model showed that this consideration affects fluid pressure
responses significantly, with a delay in fluid pressure dissipation during consolidation
process. The simulations results were compared to Terzaghi’s analytical solution for the onedimensional
consolidation problem. Also, the comparison of the simulation results to the
analytical responses clearly shows the differences between using linear elastic and
elastoplastic models. In simulations for different stress levels with the modified Cam-clay
model, it is possible to capture a flow induction effect due to high stress levels
