Publications de Vincent Labiouse

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Landslide hazard mapping aims at providing very useful information for urban planning and for risk analysis. Though landslide risks represent a common threat to human lives and properties worldwide, the procedures applied for hazard and risk assessment are ...

European-wide standard methodologies for rock fall hazard assessment and mapping would constitute a very important step towards more transparent and reproducible procedures used for these purposes, and would provide as well a higher uniformity in land use ...

The SELFRAC project aimed to study the fractures within the Excavation Damaged Zone (EDZ) around galleries in the Boom clay and Opalinus clay formations and their possible sealing/healing with time. Tests carried out at LMR-EPFL aimed at quantifying on the ...

Four gravel unconstrained flow experiments were modelled with the DAN-3D and RASH-3D codes. Both the codes, based on continuum mechanics, were developed for the propagation of rapid landslides, like rock avalanches. The codes were at first run to back-calculate the dynamic basal friction angle (frictional rheology) in order to model the runout of one of the experiments. The best fit value was then compared with the dynamic basal friction angle measured with a tilting test and finally applied for the modelli

Rockfall propagation areas can be determined using a simple geometric rule known as shadow angle or energy line method based on a simple Coulomb frictional model implemented in the CONEFALL computer program. Runout zones are estimated from a digital terrai ...

In the present work, an attempt has been achieved to describe the effects of ageing and of water on the hydro-mechanical behaviour of chalks from underground quarries of northern Parisian basin. Physical and mechanical properties were obtained as a functio ...

In order to evaluate the general conditions (i.e. safety, serviceability and durability) of tunnels, a detailed analysis of the lining structure and surrounding rock mass is required. During the service life of the tunnel, regular survey activities should ...

Rock falls represent a serious threat to communities living in mountainous areas in several European countries, and their potential hazard must be taken into account for an appropriate land-use planning and for establishing risk reduction measures. European-wide standard methods for hazard evaluation and mapping would be a very important step towards more transparent, reproducible and comparable proce-dures used for these purposes, and would provide as well a higher uniformity in land use planning and risk

The communication shows an alternative for introducing soil-structure interaction in the analysis of cut-and-cover tunnels. An uncoupled method is illustrated through two examples representative of the situations found in practice. The main features of eac ...

A series of triaxial laboratory experiments are performed on thick-walled hollow cylindrical samples of boom clay. The aim of this testing program is to better understand the anisotropic deformation during the excavation. The testing conditions are similar ...

Analytical solutions for tunnel design are widely used in practical engineering, as they allow a quick analysis of design issues such as estimation of support requirement. In recent years, several papers analyzing the behavior of rock masses that obey the ...

Cut-and-cover tunnels behavior at ultimate limit state depends strongly on the interactions between the foundation soil, the backfill and the reinforced concrete structure. Characterization of the potential failure modes of these types of structure necessi ...

Since both lining structure and rock mass exhibit delayed behaviour, tunnel equilibrium conditions evolve with time. After discussing existing work done on different aspects of long-term tunnel behaviour, the aim of this paper is to “understand” the influe ...

Although rock instabilities constitute a threat to human lives and settlements all over the world, methodologies for assessing and zoning rockfall hazards for urban development planning are far from being standardised. After presentation of the general background and classification of existing approaches, the report discusses uncertainties and difficulties which emerge when elaborating hazard maps. It is then underlined how national guidelines condition the hazard zoning and the implications on land use pla

Rockfall hazard assessment without the use of rockfall trajectory and runout zone models is unthinkable in the 21st century. Such rockfall models have existed since the sixties, but nowadays an almost confusing palette of rockfall trajectory and runout zone models in 2- and 3-D exists. Each of those adapted to specific rockfall problems. This chapter will give an exhaustive overview of available rockfall models. In addition, it will present state of the art solutions for the integration of protective measur

Rockfall is an extremely rapid process involving long travel distances. Due to these features, when an event occurs, the ability to take evasive action is practically zero and, thus, the risk of injury or loss of life is high. Damage to buildings and infra ...

Several authors have resorted to physical modelling in the field of rock avalanches. After a review of some of these works, the present paper describes tests carried out at the Ecole Polytechnique Fédérale de Lausanne. The main goal of these experiments, i ...

A proper evaluation of the perturbations of the host rock induced by the excavation and the emplacement of exothermic wastes is essential for the assessment of the long-term safety of high-level radioactive waste disposals in clay formations. The impact of ...

This paper investigates the load-bearing capacity of a perfectly smooth retaining wall laterally supported at both ends assuming that the wall fails by the development of three plastic hinges. The study considers the case of a cohesionless elastic–perfectl ...

In the framework of rockfall trajectory modelling, the bouncing phenomenon occurring when a rock block impacts with the slope surface is the most difficult to predict, owing to its complexity and its very limited understanding. To date, the rebound is comm ...

Vincent Labiouse

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Comparison of two rock fall hazard mapping methodologies based on the French and Swiss guidelines

Challenges in achieving European-wide methodologies for rock fall hazard mapping

Self-Sealing of Localised Cracks in Boom and Opalinus Clay Hollow Cylinders

Numerical simulation of gravel unconstrained flow experiments: A comparison between DAN-3D and RASH-3D codes

Technical note: Preliminary estimation of rockfall runout zones

Ageing of chalk rocks in underground quarries

Identification and analysis of Swiss National Road tunnels pathologies

Comparison of different rock fall hazard mapping methods: challenges in harmonising current procedures

Considerations on the design of cut-and-cover tunnels

Quantitative analysis of deformation in hollow cylinder tests on anisotropic clay formations

Improved analytical solutions for the response of underground excavations in rock masses satisfying the generalized Hoek-Brown failure criterion

Plasticity in soil-structure interaction applied to cut-and-cover tunnels

Analysis of the evolution of road tunnels equilibrium conditions with a convergence–confinement approach

Rockfall Hazard Zoning for Land Use Planning

Methods for predicting rockfall trajectories and runout zones

Rockfall characterization and structural protection - a review

Physical modelling to better understand rock avalanches

Consequences of the Thermal Transient on the Evolution of the Damaged Zone Around a Repository for Heat-Emitting High-Level Radioactive Waste in a Clay Formation: a Performance Assessment Perspective

Analytical and numerical analyses of the load-bearing capacity of retaining walls laterally supported at both ends

Half-scale experimental study of rockfall impacts on sandy slopes