Publications de Vincent Labiouse

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The paper presents first considerations about methodologies for local hazard mapping related to rockfalls. This work is being currently carried out at the Swiss Federal Institute of Technology of Lausanne (EPFL), and it concerns the ESR8 research position within the framework of the Mountain Risks project (Marie Curie Research Training Network, funded by EC). The main aim of the research is to collect and use the most recent approaches and results in hazard analyses in order to develop an improved methodolo

Basic principles of living with natural risks are established according to the experience of each country in facing this problem. The strategies adopted for evaluating rockfall hazards and for reducing the potential risk they represent may therefore lead to the development of quite different guidelines. In fact, despite the approach defined for this purpose in most cases consists in coupling intensity and frequency of the process, the diagram used for merging this information and/or the threshold values pro

Most rock fall hazard zoning methodologies are currently based on trajectory modelling, usually performed along 2D slope profiles. For many topographic configurations, this approach cannot provide a realistic description of the way rock fall trajectories a ...

In the context of nuclear waste disposal in clay formations, laboratory experiments were performed to study at reduced scale the Excavation Damaged Zone (EDZ) induced by the construction of galleries in the Boom Clay formation. For this purpose, thick-wall ...

The need to cope with rockfall hazard and risk led many countries to adopt proper strategies for hazard mapping and risk management, based on their own social and political constraints. The experience of every single country in facing this challenge provides useful information and possible approaches to evaluate rockfall hazard and risk. More, with particular regard to the hazard mapping process, some important points are common to many methodologies in Europe, especially as for the use of rock fall intensi

Boom Clay is extensively studied as a potential candidate to host underground nuclear waste disposal in Belgium. To guarantee the safety of such a disposal, the mechanical behaviour of the clay during gallery excavation must be properly predicted. In that ...

Adopting effective maintenance strategies for transportation infrastructures requires good prediction of their long-term behaviour. For planning interventions without affecting the entire network’s capacity, tunnels in particular require a good overview of ...

Laboratory experiments play an important role in improving the modelling of rock avalanches since they contribute to a better understanding of the mechanisms that characterise propagation and to identifying parameters influencing velocity and deposit chara ...

In the context of nuclear waste disposal in clay formations, laboratory and in situ simulation experiments were performed to study at reduced scale the Excavation Damaged Zone (EDZ) around tunnels in the indurated Opalinus Clay at Mont Terri, Switzerland. ...

During the crossing of brittle rock formations at the Lötschberg base tunnel, failure phenomena have been observed both at the tunnel face and at the walls. A detailed analysis has been undertaken to explain these behaviours, based on the recent developmen ...

Rockfall constitute a serious threat to communities living in mountainous areas all over the world, and their potential hazard must be taken into account for an appropriate land use planning and for establishing risk mitigation measures. This chapter deals with guidelines and methodologies for assessing and zoning rockfall hazards for urban development planning. Depending on the purpose of the study, on the scale, as well as on the availability and quality of data, several methods are available, each based

The paper focuses on the delayed behaviour of marls induced by a change in stress state and by the effect of water. Seven experiments were conducted in oedometric cells on marl from the Arbus tunnel (France). The samples were subjected to a single loading step (i.e one-stage creep test) or to successive loading steps (i.e. multi-stage creep test) followed, after hydration, by several unloading stages. For the creep behaviour, Lemaitre’s law is found adequate to model the viscoplastic strain, but its paramet

Laboratory experiments which consist of releasing dry rigid non-cohesive grains or small bricks on an unconfined chute have been designed to investigate rock avalanche propagation mechanisms and to identify parameters influencing their deposit characterist ...

The aim of the TIMODAZ project is to investigate the effect of thermal changes on the excavation damaged zone (EDZ) around nuclear deep disposals in clay-based geological formations. In the framework of WP5.2 of this project, it is intended to develop cons ...

Rock fall hazard assessment and hazard mapping are essential for the risk management of vulnerable areas. This paper analyses some issues concerning fragmental rock fall hazard mapping methodologies. Two Swiss approaches based on rock fall trajectory simul ...

Landslide continuum dynamic models have improved considerably in the last years, but a consensus on the best method of calibrating the input resistance parameter values for predictive analyses has not yet emerged. In the present paper, numerical simulation ...

Within the framework of the TIMODAZ project laboratory and in-situ experiments have been performed to study the failure processes around tunnels in laminated clay rich sedimentary rocks at reduced scale. The fracture patterns observed in the hollow cylinde ...

Laboratory experiments carried out at the LMR-EPFL on thick-walled hollow cylindrical samples aim at modelling at small-scale conditions similar to those that will be experienced by host rocks around disposal galleries for heat emitting radioactive waste. The paper presents results on a Boom Clay sample cored parallel to the bedding planes and subjected to a decrease of the confining pressure in the central hole of the hollow cylinder. It focuses on medium resolution X-Ray Computed Tomography (XRCT) scans o

Rock fall hazard zoning is a challenging yet necessary task to be accomplished for planning an appropriate land use in mountainous areas. Methodologies currently adopted for elaborating zoning maps do not provide satisfactory results though, due to uncerta ...

This section reviews the current methodologies that are used for the assessment of the rockfall susceptibility, hazard and risk. Emphasis is given on quantitative methods although qualitative ones are also discussed. The different methodologies are presented with respect to their application scales (regional, local or site-specific). Highlight is given to recent advances, especially involving the consideration of the magnitude of the events and the intensity of the phenomena at selected locations as well as

Vincent Labiouse

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Considerations on rockfall hazard mapping based on trajectory modelling

Influence of national rockfall hazard guidelines on land-use planning

New Cadanav Methodology for Rock Fall Hazard Zoning Based on 3D Trajectory Modelling

Hollow cylinder simulation experiments of galleries in Boom Clay formation

Differences in experiences in rockfall hazard mapping in Switzerland and Principality of Andorra

Hollow Cylinder Tests on Boom Clay: Modelling of Strain Localization in the Anisotropic Excavation Damaged Zone

A GIS based approach for analysing geological and operation conditions influence on road tunnels degradation

Flow experiments with gravel and blocks at small scale to investigate parameters and mechanisms involved in rock avalanches

Laboratory and in situ simulation tests of the Excavation Damaged Zone around galleries in Opalinus Clay

Brittle rock failure in the Steg lateral adit of the Lötschberg base tunnel

Rockfall hazard zoning for land use planning

Analysis of multi-stage creep and swelling oedometric tests on a French marl

Empirical and analytical analyses of laboratory granular flows to investigate rock avalanche propagation

Thermo-Hydro-Mechanical Modelling of Hollow Cylinder Laboratory Experiments on Boom Clay

Considerations on Swiss methodologies for rock fall hazard mapping based on trajectory modelling

Numerical modelling of gravel unconstrained flow experiments with the DAN(3D) and RASH(3D) codes

Laboratory and in Situ Simulation Tests of the Fracturing in the EDZ around Galleries in Opalinus Clay

Medium resolution X-Ray Computed Tomography of hollow cylindrical samples of Boom Clay

New Cadanav methodology for quantitative rock fall hazard assessment and zoning at the local scale

Review and Advances in Methodologies for Rockfall Hazard and Risk Assessment