Daniel F. Ruiz

• PhD in Geotechnical Engineering
• Professor (Assistant) at Universidad EAFIT

This chapter presents an overview of modeling frameworks available within the theory of elastoplasticity and able to capture main features of shale behavior including: yield under compression, failure under deviatoric strain, strain‐softening, degradation, anisotropy of elastic moduli, strength and permeability, as well as creep and viscous respons...

The paper addresses the numerical simulation of strain localisation in stiff clays that exhibit softening behaviour. An elastoplastic constitutive model developed to incorporate key features of stiff clay behaviour is described first. A non-local formulation is then introduced for the regularisation of the analysis of localisation. A series of anal...

The paper contains a coupled numerical analysis of the hydration of a potential sealing system for isolating shafts, ramps, and connecting galleries in a deep geological repository for high level nuclear waste. The modeling adopted for the different components of the seal are described first together with the basic features of the numerical model....

In the present paper a nonlocal plasticity model is described, intended to reproduce the mechanical behaviour of stiff fine-grained soils, including the objective simulation of strain localization; the phenomenon of accumulation of deformations in narrow zones in the form of shear bands or fractures. A number of analyses have been performed to asse...

The paper presents selected results from a hydromechanical analysis of an excavation at great depth in argillaceous rock. A constitutive model specifically developed for this type of materials has been used. It incorporated anisotropy of strength and stiffness, stress-strain nonlinearity, significant softening after peak, time-dependent creep defor...

The paper presents a constitutive model for argillaceous rocks, developed within the framework of elastoplasticity, that includes a number of features that are relevant for a satisfactory description of their hydromechanical behaviour: anisotropy of strength and stiffness, nonlinear behaviour and occurrence of plastic strains prior to peak strength...

The paper presents a constitutive model for argillaceous rocks, developed within the framework of elastoplasticity, that includes a number of features that are relevant for a satisfactory description of their hydromechanical behaviour: anisotropy of strength and stiffness, behaviour nonlinearity and occurrence of plastic strains prior to peak stren...

A cross-anisotropic formulation for elasto-plastic constitutive models based on a non-uniform scaling of the stress tensor is described. Taking advantage of the material symmetries characterising cross-anisotropy, only two scaling factors, one for the normal stress components and one for the shear stress components, are required. It is shown that t...

Currently underground storage is considered as the most suitable management procedure for high-level nuclear waste. A deep repository is composed by different kinds of galleries. Keeping in mind that the final goal is the isolation of the waste from the biosphere, an effective sealing system of the galleries has to be implemented. The response of t...

A cross-anisotropic extension of an elastoplastic constitutive model is described, based on a non-uniform scaling of the stress tensor. The Mohr-Coulomb yield condition is employed, although this concept can be applied to any other stress-based criterion. It has as main advantage the possibility of being incorporated into an already implemented con...

The construction of a repository will involve the sinking of a number of access shafts, the excavation of a network of horizontal access drifts and the drilling of vertical boreholes or excavation of additional horizontal drifts for waste emplacement. Prior to closure, it will be necessary to seal and backfill access tunnels and shafts so that they...

This study presents the results of a numerical analysis aimed to reproduce the hydromechanical behaviour of the GCS drift, in the Meuse/Haute-Marne Underground ResearchLaboratory (MHM URL), excavated in the Callovo-Oxfordian claystone (COX) formation. The employed constitutive model was developed under the framework of elastoplasticity and includes...

Landslides induced by rainfall represent a significant natural hazard for large part of Europe. The catastrophic flowslides that occurred on steep slopes in Campania (southern Italy) in 1998, 1999, and 2005 were triggered by rainwater infiltration into shallow deposits of pyroclastic soils, which were initially unsaturated. In this work we present...

Landslides induced by rainfall represent a significant natural hazard for large part of Europe. The catastrophic flowslides that occurred on steep slopes in Campania (southern Italy) in 1998, 1999, and 2005 were triggered by rainwater infiltration into shallow deposits of pyroclastic soils, which were initially unsaturated. In this work we present...

This paper deals with the numerical analysis of the response of a rock cliff that presents recurrent instabilities as the results of the effect the climatic actions. The Rock cliff is located above an important historic and touristic village, France. It has been recently instrumented in order to detect possible forthcoming failures after the last i...

This paper presents the modelling of a particular case under climatic actions; specifically it is a calcareous cliff exposed to solar radiation and changes in air temperature. Due to recent failure of the roof within cavern (2010) situated at mid-height of the cliff was generated an investigation through instrumentation within and above it. The int...

The city of Medellin and the Aburra Valley (Valle del Aburra), as part of microzonification projects, has installed seismic networks composed by three-directional accelerographs. The network equipment is located in order to identify local effects in the Aburrá Valley, considering that may occur simultaneously amplification effects of the soil and g...