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Results
Morphological Analysis of Natural Marble Discontinuities
Hoang, T. T.N. (Laboratoire Régional des Ponts et Chaussées) | Gasc-Barbier, M. (Laboratoire Régional des Ponts et Chaussées) | Marache, A. (Université de Bordeaux) | Riss, J. (Université de Bordeaux) | Sulem, J. (UR Navier, CERMES, École des Ponts ParisTech)
ABSTRACT: In order to evaluate the influence of the surface morphology on the mechanical behavior of twelve natural rock joints, very accurate topography measurements of joint surfaces were performed before and after shear tests. The quantitative description of surfaces was performed using global and directional statistical parameters that lead to identify three groups of similar morphology according to a given direction. Based on the topography data of joint surfaces obtained before and after shearing, damage zones that occur during shearing were located for both walls of each joint. These characterizations of joint surfaces contribute to better understanding the shearing behavior of natural discontinuities. 1 INTRODUCTION It is well known that the deformability and the stability of rock masses depend mainly on the presence and the orientation of discontinuities and that their mechanical behavior is strongly related to the geometry of fracture surfaces. Our study is focused on natural joints. The test specimens come from core samples extracted for the preliminary design studies to ensure the excavation of a tunnel near St Béat, a small town on the highway no 125 in the French Pyrenees just 5 km before Spain. The site is located in the internal metamorphic zone of the Pyrenees with a rock formation dating from Lias and Lower Albian ages, which corresponds to a lithology dominated by metamorphic limestone or dolomite (marble). The rock mass is highly fractured. Some previous studies have been performed on this site: the fracture network as observed on outcrops has been presented in Gasc-Barbier et al. (2006), a discussion on the uncertainties affecting the knowledge of the fracture network in Gasc-Barbier et al. (2010) and some basic geometric and geomechanical simulations based on these fracture networks in Merrien-Soukatchoff et al. (2007).
- Geology > Geological Subdiscipline > Geomechanics (0.68)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (0.54)
- Well Completion > Hydraulic Fracturing (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization (1.00)
- Data Science & Engineering Analytics > Information Management and Systems (0.83)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Naturally-fractured reservoirs (0.75)
Mechanical Behavior of Natural Marble Discontinuities
Hoang, T. T.N. (Laboratoire Régional des Ponts et Chaussées) | Gasc-Barbier, M. (Laboratoire Régional des Ponts et Chaussées) | Sulem, J. (UR Navier, CERMES, École des Ponts ParisTech) | Marache, A. (Université Bordeaux) | Riss, J. (Université Bordeaux)
ABSTRACT: Laboratory mechanical characterization of natural discontinuities in marble is performed using a shear test apparatus. Samples with different morphological characteristics are selected. The direct shear tests were carried out under Constant Normal Loading (CNL) condition for a complete displacement cycle. The influence of the normal stress and the shear rate on the behavior of the discontinuities is investigated. 1 INTRODUCTION In fractured rock masses, the mechanical behavior is strongly dependent on the discontinuities. In order to understand the structural stability of jointed rock mass, it is necessary to study of the behavior of rock discontinuities under different loading conditions. The mechanical behavior of rock discontinuities is commonly studied in the laboratory using a direct shear apparatus. Many studies have been performed on artificial joints with saw-tooth (Crawford&Curran 1981, Huang et al. 1993, Homand et al. 2001, Lee et al. 2001, Biran et al. 2009) or on mortar replicas (Bandis et al. 1981, Jing et al. 1993, Gentier et al. 2000). Some authors have performed shear tests on natural rock joints (Huang et al. 1993, Armand et al. 1998). Huang et al. (1993) found that the natural rock joints showed some different characteristics as compared the artificial joints under cyclic loading. The site is located in the internal metamorphic zone of the Pyrenees with a rock formation dating from Lias and Lower Albian ages, which corresponds to a lithology dominated by metamorphic limestone or dolomite (marble). The rock mass is highly fractured. Some previous studies have been performed on this site: the fracture network as observed on outcrops has been presented in Gasc-Barbier et al. (2006), a discussion on the uncertainties affecting the knowledge of the fracture network in Gasc-Barbier et al. (2010) and some basic geometric and geomechanical simulations based on these fracture networks in Merrien-Soukatchoff et al. (2007).
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (0.54)