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Archive | 2006

MODELS AVAILABLE TO UNDERSTAND FAILURE AND PRE-FAILURE BEHAVIOUR OF LARGE ROCK SLOPE MOVEMENTS: THE CASE OF LA CLAPIÈRE, SOUTHERN ALPS, FRANCE

Véronique Merrien-Soukatchoff; Yann Gunzburger

We examine the choices model-users have to face when applying models to better understand slope failure and prefailure movements of large rock slopes and illustrate how modelling can help understand rock slope movements. At first, the questions that the models can help to answer are listed. The different types of models available to understand the hydromechanical behaviour of rock slope movements are then specified. Different types of models have been applied to the La Clapiere case. This movement is described and three different modelling analyses of this landslide are outlined. Each model allows an understanding of a part of the problem raised by rock slope movements, but none of them can actually represent totally the phenomena involved in the movement.


International Congress and Exhibition "Sustainable Civil Infrastructures: Innovative Infrastructure Geotechnology" | 2017

3D Numerical Simulation of the Goaf Due to Large-Scale Longwall Mining

Samar S. Ahmed; Marwan AlHeib; Yann Gunzburger; Vincent Renaud

Due to longwall excavations, the upper strata disturb, the roof and the floor of the opening become in contact. This disturbed area is commonly known as the “goaf area”. The challenge of simulating numerically the goaf area is to identify its geometry and its equivalent mechanical properties. The main objective of this study is to improve the 3D numerical simulation of longwall mining and its accompanying goaf area, which will permit us to observe the stress changes due to longwall excavations. The Provence coal mine in the South of France has been chosen to be the case study of the current research, where the mined coal seam has 2.5 m thickness and the average depth of the mine is 1000 m. The longwall panels have a regular width of 200 m and various lengths from 400 up to 1400 m. A large-scale finite difference numerical model of the mine was constructed by using FLAC3D. The numerical modeling of the goaf area was performed in two steps. The first step was to identify the geometry of the goaf area above longwall panels. The second step was to calibrate its equivalent mechanical properties with the total convergence between the roof and the floor. The goaf geometry and the mechanical properties were then calibrated with the in-situ surface subsidence. The results show that applying a linearly varying elastic modulus within the goaf area is a very effective method to express its heterogeneity, which also gave rational surface subsidence values for panels width less than 1000 m. In addition, in terms of stress redistribution, the induced vertical stress increases progressively with panel width, and it becomes close to the initial values at the center of the goaf for panel width larger than 1000 m.


Revue Française de Génie Civil | 2004

Prédisposition, préparation et déclenchement des mouvements de versant : L'exemple des Rochers de Valabres (Alpes-Maritimes)

Yann Gunzburger

ABSTRACT Rock slope movements can be considered, from a mechanical standpoint, as the consequence of predisposition, preparation and trigger factors. In the case study of the “Rochers de Valabres” slope (Southern French Alps), which experienced major rockfalls in 2000 and 2004, these factors are analysed by means of field observations, high-precision geodetic monitoring and acoustic emissions monitoring, as well as by numerical modelling. This paper places special emphasis on the role of both the fracture network and thermal effects.


International Journal of Rock Mechanics and Mining Sciences | 2005

Influence of daily surface temperature fluctuations on rock slope stability: case study of the Rochers de Valabres slope (France)

Yann Gunzburger; Véronique Merrien-Soukatchoff; Yves Guglielmi


Comptes Rendus Geoscience | 2002

Origine tectonique du pli supportant le glissement de terrain de la Clapière (Nord-Ouest du massif de l'Argentera–Mercantour, Alpes du Sud, France) d'après l'analyse de la fracturation

Yann Gunzburger; Bernard Laumonier


Earth Surface Processes and Landforms | 2011

Near-surface temperatures and heat balance of bare outcrops exposed to solar radiation

Yann Gunzburger; Véronique Merrien-Soukatchoff


Tectonophysics | 2014

Stress inversion and basement-cover stress transmission across weak layers in the Paris basin, France

Yann Gunzburger; Vincent Magnenet


Natural Hazards and Earth System Sciences | 2014

Statistical correlation between meteorological and rockfall databases

A. Delonca; Yann Gunzburger; Thierry Verdel


Tectonophysics | 2010

Stress state interpretation in light of pressure-solution creep: Numerical modelling of limestone in the Eastern Paris Basin, France

Yann Gunzburger


The Extractive Industries and Society | 2017

Social perception of unconventional gas extraction on the outskirts of a former coal-mining area in Northeast France

Yann Gunzburger; Marie-France Agnoletti; Michel Deshaies; Samuel Ferey; Pascal Raggi

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Vincent Renaud

École Normale Supérieure

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A. Delonca

University of Lorraine

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Yves Guglielmi

Aix-Marseille University

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Jean-Dominique Barnichon

Institut de radioprotection et de sûreté nucléaire

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