Browsing by Author "Detournay, Emmanuel"

Now showing 1 - 13 of 13
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    Data for Response of a large, low porosity rock sample to hydromechanical loading
    (2024-10-22) Asem, Pouyan; Detournay, Emmanuel; Voller, Vaughan; Labuz, Joseph; pasem@umn.edu; Asem, Pouyan; University of Minnesota
    A unique laboratory framework is developed for measuring hydromechanical parameters in a 6025 mL confined specimen of Westerly blue granite. Tracking the water uptake in the sample shows that infiltration over a length scale of 230 mm is effectively modeled by assuming a sharp front separating saturated and dry regions. Through matching the movement of this front with the experimental data, an estimate of the sample permeability is obtained. In addition, following full saturation, Skempton coefficient B, drained bulk modulus K, unjacketed bulk modulus Ks′, and unjacketed pore modulus Ks'' are determined. Thus, we demonstrate that a single experimental framework for measuring the infiltration and saturation of a large, tight rock specimen provides a significant array of reliable parameters for use in modeling and characterizing critical hydrogeological processes.
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    Data for Saturating a Tight Rock and Measuring Its Hydromechanical Response
    (2023-08-21) Asem, Pouyan; Detournay, Emmanuel; Huang, Haiying; Labuz, Joseph; pasem@umn.edu; Asem, Pouyan
    Investigation of hydromechanical behavior of fluid-saturated tight rock is motivated by the need to quantify the effect of changes of fluid pressure p and mean stress P on rock deformation, hydrothermal fluid, and mass transport. In particular, hydromechanical properties of low porosity crystalline rock are required for analysis of geological processes including areal hydration or dehydration, mineral weathering, and fault mechanics. In this study, poroelastic parameters – drained bulk modulus K, and Biot coefficient α – governing the volumetric response of Westerly blue granite, a typical crystalline rock of low porosity are measured. Three additional hydromechanical properties, unjacketed bulk modulus Ks , expansion modulus H, and permeability k, are also measured. For the Terzaghi effective mean stress of 1.0 < P′ = P −p < 25.0 MPa, the unjacketed bulk modulus Ks = 57.5 GPa is constant within the range of mean stresses investigated but other poroelastic coeff icients exhibit effective mean stress dependency; the ranges are 13.2 < K < 32.3 GPa, 19.0 < H < 60.0 GPa, 0.83 > α > 0.38, and 20 > k > 5 nanodarcy. The agreement between poroelastic coefficients determined from various methods suggests that the underlying linear elastic assumption in Biot’s theory of poroelasticity is applicable to Westerly blue granite over small increments of effective mean stress.
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    Line Source in a Poroelastic Layer Bounded by an Elastic Space
    (2015) Mark, Julien; Savitski, Alexei; Detournay, Emmanuel
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    MATLAB codes for "Fast In-Plane Dynamics of a Beam with Unilateral Constraints"
    (2016-06-02) Liakou, Anna; Detournay, Emmanuel; Denoël, Vincent; aliakou81@gmail.com; Liakou, Anna
    A computationally efficient technique to simulate the dynamic response of a beam colliding with rigid obstacles is described in this paper. The proposed method merges three key concepts. First, a low order discretization scheme that maximizes the number of nodes of the discrete model, where impacts are detected, at the expense of the degree of continuity of the constructed displacement field. Second, the constrained problem is transformed into an unconstrained one by formulating the impact by means of a complementarity Signorini's law involving the impulse generated by the collision and the pre- and post- impact velocity linked via a coefficient of restitution. Third, Moreau's midpoint time-stepping scheme developed within the context of colliding rigid bodies, is used to advance the solution.
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    Modeling Axisymmetric Cracks in an Elastic Half-Space
    (2011-06-23) Gordeliy, Elizaveta; Detournay, Emmanuel
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    Scratch test results for Alabama marble
    (2022-07-18) Zhang, He; Le, Jia-Liang; Detournay, Emmanuel; detou001@umn.edu; Detournay, Emmanuel; Dr. Emmanuel Detournay
    This dataset contains cutting force signals, videos of rock cutting processes, particle size distribution from sieving analysis obtained from scratch tests conducted on Alabama marble at different depths of cut, which cover the rock failure in ductile, fragmentation and brittle regimes. The force signals and videos can be used to study the rock failure mechanism and energy scaling in the rock cutting process. The particle size distribution data explains the energy dissipation in rock cutting process and the scaling law of the specific energy in the fragmentation regime.
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    Scratch test results for Bonne Terre dolomite
    (2022-07-18) Zhang, He; Le, Jia-Liang; Detournay, Emmanuel; detou001@umn.edu; Detournay, Emmanuel; Dr. Emmanuel Detournay
    This dataset contains cutting force signals, videos of rock cutting processes, particle size distribution from sieving analysis obtained from scratch tests conducted on Bonne Terre dolomite at different depths of cut, which cover the rock failure in ductile, fragmentation and brittle regimes. The force signals and videos can be used to study the rock failure mechanism and energy scaling in the rock cutting process.
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    Scratch test results for Burlington limestone
    (2022-07-18) Zhang, He; Le, Jia-Liang; Detournay, Emmanuel; detou001@umn.edu; Detournay, Emmanuel; Dr. Emmanuel Detournay
    This dataset contains cutting force signals, videos of rock cutting processes, particle size distribution from sieving analysis obtained from scratch tests conducted on Burlington limestone at different depths of cut, which cover the rock failure in ductile, fragmentation and brittle regimes. The force signals and videos can be used to study the rock failure mechanism and energy scaling in the rock cutting process.
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    Scratch test results for Dunnville sandstone
    (2022-07-18) Zhang, He; Le, Jia-Liang; Detournay, Emmanuel; detou001@umn.edu; Detournay, Emmanuel; Dr. Emmanuel Detournay
    This dataset contains cutting force signals, videos of rock cutting processes, particle size distribution from sieving analysis obtained from scratch tests conducted on Dunnville sandstone at different depths of cut, which cover the rock failure in ductile, fragmentation and brittle regimes. The force signals and videos can be used to study the rock failure mechanism and energy scaling in the rock cutting process. The particle size distribution data explains the energy dissipation in rock cutting process and the scaling law of the specific energy in the fragmentation regime.
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    Shallow Hydraulic Fracture
    (2010-02-08) Gordeliy, Elizaveta; Detournay, Emmanuel
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    Underground Nuclear Testing in French Polynesia: Stability and Hydrology Issues
    (International Geomechanical Commission, 1999) Fairhurst, Charles; Brown, Edwin T.; Detournay, Emmanuel; Marsily, Ghislain de; Nikolaevshiy, Victor; Pearson, J.R. Anthony; Townley, Lloyd; Berest, Pierre
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    Uniaxial compressive strength test and indirect tensile tests for four types of rocks
    (2022-07-18) Zhang, He; Le, Jia-Liang; Detournay, Emmanuel; detou001@umn.edu; Detournay, Emmanuel; Dr. Emmanuel Detournay