The excavation damage zone surrounding an underground tunnel/gallery, and in particular its evolution, is being studied for the performance assessment of a radioactive waste repository. This paper focuses on numerical analysis self-sealing damaged based in-situ CDZ experiment exploring during hydration process. A plastic model employed to describe mechanical behaviour Callovo-Oxfordian clayston...

The Opalinus Clay is a claystone considered as potential host rock for deep geological disposal of radioactive wastes in Switzerland and Gemany. During the operational phase repository, an increase underground water pH , from 7.5 to value high 13.5 expected, due release alkaline plumes concrete degradation, resulting possible changes mineralogy rock. While clay mineral dissolution known occur a...

A high-speed railway viaduct experienced a sustained heave at high rates after its construction. The pillars of the bridge are founded on an Eocene hard anhydritic-gypsiferous claystone by means of massive foundations. Field investigations identified an active layer below the piles’ tips where expansions occur as a result of gypsum crystal growth in discontinuities from supersaturated aqueous s...

In this paper, we present a detailed analysis of the possibility using unsupervised machine learning techniques for reservoir interpretation based on parameters obtained from geophysical measurements that are related to elastic properties rocks. Four different clustering algorithms were compared, including balanced iterative reducing and hierarchies, Gaussian mixture model, k-means, spectral cl...

This paper presents a modified Biot’s model for describing the hydromechanical behaviour of Callovo-Oxfordian Argillite (COx) Claystone. The COx Claystone exhibits significant deformation during water desaturation/resaturation, and standard is unable to predict large shrinkage/swelling material. authors then introduced an additional swelling/shrinkage law simulate deformations upon changes in c...