Publications by Francesco Parisio

Hydro-mechanical modeling of tunnel excavation in anisotropic shale with coupled damage-plasticity and micro-dilatant regularization

Lyesse Laloui, Francesco Parisio, Victor Vilarrasa Riano

The disposal of highly radioactive spent nuclear fuel in deep geological media will require excavating a large number of galleries in low-permeable rocks, altering initial rock integrity at the repository site. The FE-tunnel excavated in Opalinus Clay at t ...

2018

On the formulation of anisotropic-polyaxial failure criteria: a comparative study

Lyesse Laloui, Francesco Parisio

The correct representation of the failure of geomaterials that feature strength anisotropy and polyaxiality is crucial for many applications. In this contribution, we propose and evaluate through a comparative study a generalized framework that covers both ...

2017

Plastic-damage modeling of saturated quasi-brittle shales

Lyesse Laloui, Francesco Parisio

The constitutive modeling of shales is an important topic in the geomechanics community as it is often encountered in advanced applications such as nuclear waste storage, CO2 sequestration, and unconventional oil and gas exploitation. The goal of this work ...

Elsevier2017

Strength evolution of geomaterials in the octahedral plane under non-isothermal and unsaturated conditions

Lyesse Laloui, Francesco Parisio, Victor Vilarrasa Riano

Current geomechanical applications imply non-isothermal processes of unsaturated geomaterials, in most cases following stress paths different than the classical triaxial compression often used in laboratory testing. Though the effects of temperature, sucti ...

American Society of Civil Engineers2017

Constitutive and numerical modeling of anisotropic quasi-brittle shales

Francesco Parisio

Understanding the hydro-mechanical behavior of shale is fundamental to assess the safety of deep geological nuclear repository sites. Several countries have adopted argillaceous formations as host geological media for the repository. In Switzerland, the ca ...

EPFL2016

Constitutive analysis of shale: a coupled damage plasticity approach

Lyesse Laloui, Francesco Parisio

Shales have become increasingly important because they play key roles in modern energy and environmental geomechanics applications, such as nuclear waste storage, non-conventional oil and gas operations and CO2 geological storage. Shale behaves in a quasi- ...

Elsevier2015

An elasto-plastic-damage model for quasi-brittle shales

Lyesse Laloui, Francesco Parisio, Sergio Luis Samat

A constitutive model that couples elastic-plastic and damage theories is developed to predict the mechanical behavior of a shale from the Mont Terri rock laboratory (Opalinus Clay). The framework of continuum damage mechanics allows to predict the degradat ...

2014