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Keywords: experiment
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Proceedings Papers
Comparison of Depth-Averaged and 3D Models for Dense Granular Flows
Available to Purchase
Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-100
...: In Section 2, we focus on a DAM model (DAN-W [29]) and a 3D LBM model (Hybird [30 In Section 3 and 4, we discuss the experiment setup and compare the experimental and numerical results. Finally, in Section 5 we discuss the results and possible future extension to more complex scenarios. 2. Numerical models...
Proceedings Papers
Evaluation of the Basic Friction Angle in Dry and Conditioned Fluids by Tilt Tests
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Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-023
... different liquid conditions, dry, pH2, pH7 and pH12 were carried out under different test fluid conditions. Basic friction angles were measured 5 times in each group experiment. Initial basic friction angles were high regardless of sample type and experimental conditions. But; as the measurements continued...
Proceedings Papers
Combining Active and Passive Acoustic Methods to Image Hydraulic Fracture Growth in Laboratory Experiments
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Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-087
... to perform an acoustic survey at repetitive intervals (every 10 seconds) during a hydraulic fracture growth experiment. The analysis of the evolution of the active acoustic monitoring changes allow to image the evolution of the fracture front (via an inversion of the active acoustic waves diffracted...
Proceedings Papers
Mechanical Investigation of Rock-Proppant Interaction with Focus on Geothermal Applications
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Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-027
... 141 ± 23 tensile strength MPa 9,4 ± 2,0 Young´s modulus GPa 35 ± 4 compressional wave velocity km/s 5,6 ± 0,3 permeability m² < 10-18 The experimental setup for experiments with proppants is shown in figure 2. During the tests, the proppants were placed between two cylindrical rock specimens...
Proceedings Papers
Experimental Program on Mechanical Properties of Large Rock Fractures
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Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-010
... loading condition. The other in situ experiments were not realized due to the experimental complexity, uncertainties, and high associated costs. Small scale direct shear experiments were carried out on specimens with Breccia and Calcite infilled fractures 2 Mechanics and Rock Engineering, from Theory...
Proceedings Papers
Photoelastic Stress Analysis of Mode I Fracture Toughness Tests Using PMMA Samples
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Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-026
... the photoelastic analysis, all the experiments were complemented with a specially-designed experimental setup consisting in two orthogonally arranged circular polarizers placed on both sides of the tested specimens. Using a source of white (polychromatic) light on one end it is possible to record the stress...
Proceedings Papers
Acoustic Emission and Digital Image Correlation for Damage Evolution in Brittle Rocks Under Time-Dependent Tensile Loading
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Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-089
... (DIC) data to describe the evolution of damage and cracking in response to tensile loading during multi-stage relaxation experiments on inverted single edge notch bending (iSENB) specimens. The source locations of the AEs correspond to a process zone ahead and around the notch indicating the evolution...
Proceedings Papers
Development of a Direct Shear Testing Method Using True Triaxial Apparatus
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Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-008
... of pore pressure through effective utilization of a true triaxial loading system. An overview of the experimental method, its advantages, and results showing the usefulness of the experiment were presented. Sample permeability in the direction parallel to the joint was measured during the shear test. 1...
Proceedings Papers
Hydrofracturing Tests on Granite Samples Using a True Triaxial Device Equipped with Acoustic Emission Sensors
Available to PurchaseM. Herbón-Penabad, A. Muñoz-Ibáñez, J. Delgado-Martín, N. González Molano, J. Alvarellos-Iglesias, J. Canal-Vila
Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-190
... Abstract We present a series of tests performed on granite samples using a true triaxial device designed and built at the Rock Mechanics Laboratory (University of A Coruña). The experiments were performed using cubic rock samples of 150 mm-edge, which were loaded to different stress conditions...
Proceedings Papers
Multiple Radial Fractures Connecting Horizontal Boreholes – a Lab Study on the Feasibility of the Multifrac Concept for Geothermal Heat Extraction from Deep Reservoirs with Low Permeability
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Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-189
... an experimental setup involving a true-triaxial compression frame for cubic rock samples and a high-pressure metering pump fluid injection system. Similar laboratory experiments have been conducted in previous studies, e.g. on the creating enhanced geothermal systems within crystalline rocks [1...
Proceedings Papers
Monitoring of Rock Stress Change Using Instrumented Rebar Rock Bolts
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Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-142
... a method to monitor stress changes in the rock mass using rebar rock bolts instrumented with strain gauges to track the stress within the bolt. Next to that, we describe in-situ testing of this method using heating-induced stress in a natural underground environment. The heating experiment aims to create...
Proceedings Papers
Size Effects and Non-Fourier Thermal Behaviour in Rocks
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Paper presented at the ISRM International Symposium - EUROCK 2020, June 14–19, 2020
Paper Number: ISRM-EUROCK-2020-180
... effect, a temperature wave that propagates with the speed of sound. It is characteristic of low-temperature situations, too. All these successes have led to further experimental works, where similar wave phenomena are tried to be found at room temperature on macroscale. One famous experiment is performed...
Proceedings Papers
Hydromechanical Behavior of a Synthetic Homogenous Carbonate Rock During Direct Shear
Available to PurchaseAusama Giwelli, Lionel Esteban, Vincent Lemiale, Claudio Delle Piane, M. Ben Clennell, John Raimon, Graham Price, Melissa CDN Kiewiet, Flávia Falcão
Paper presented at the ISRM European Rock Mechanics Symposium - EUROCK 2017, June 20–22, 2017
Paper Number: ISRM-EUROCK-2017-103
... to the experimental study, a 2D mechanical model of the shear experiments was developed using Smoothed Particle Hydrodynamics (SPH), suitable for deformation processes involving very large strains. Numerical results were compared with the experimental data for a better understanding of local deformation process...
Proceedings Papers
Automated Full Waveform Detection and Location Algorithm of Acoustic Emissions from Hydraulic Fracturing Experiment
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Paper presented at the ISRM European Rock Mechanics Symposium - EUROCK 2017, June 20–22, 2017
Paper Number: ISRM-EUROCK-2017-089
... Abstract A near field network with 11 acoustic emission (AE) sensors was installed for the in situ underground experiment (Nova project 54–14–1) that took place 410 m below surface in the Äspö Hard Rock Laboratory, Sweden. The acquisition system for the piezoelectrical sensors has been...
Proceedings Papers
New Insights into Fracture Process through In-Situ Acoustic Emission Monitoring during Fatigue Hydraulic Fracture Experiment in Äspö Hard Rock Laboratory
Available to PurchaseGrzegorz Kwiatek, Katrin Plenkers, Patricia Martínez-Garzón, Maria Leonhardt, Arno Zang, Georg Dresen
Paper presented at the ISRM European Rock Mechanics Symposium - EUROCK 2017, June 20–22, 2017
Paper Number: ISRM-EUROCK-2017-079
... Abstract In this study we analyze the nano- and picoseismicity recorded during the Fatigue Hydraulic Fracturing (FHF) in situ experiment performed in Äspö Hard Rock Laboratory, Sweden. The fracturing experiment composed of six fractures driven by three different water injection schemes...
Proceedings Papers
Injection of Supercritical Carbon Dioxide into Granitic Rock and its Acoustic Emission Monitoring
Available to PurchaseTsuyoshi Ishida, Shuich Desaki, Hiroto Yamashita, Shuhei Inui, Makoto Naoi, Hirokazu Fujii, Tatsuo Katayama
Paper presented at the ISRM European Rock Mechanics Symposium - EUROCK 2017, June 20–22, 2017
Paper Number: ISRM-EUROCK-2017-060
... state. The viscosity of supercritical CO 2 (SC-CO 2 ) is one or two order of magnitude smaller than that of normal liquid water. To examine effect of fracturing fluid viscosity on a crack features induced by hydraulic fracturing (HF), Ishida et al. [2, 3] made HF experiments using SC-CO 2 , liquid CO 2...
Proceedings Papers
Waterjet Drilling of Sealing Cement
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Paper presented at the ISRM European Rock Mechanics Symposium - EUROCK 2017, June 20–22, 2017
Paper Number: ISRM-EUROCK-2017-110
.... The tensile strength of the specimen was measured by a splitting tensile test (Brazilian test). Fig. 1. Photo of cement paste specimens: (a) cement paste specimen just after pouring the mold; (b) cement paste specimens during the curing process. 2.2. Waterjet drilling experiment Photos of the experimental...
Proceedings Papers
Deformational Response of Rocks to Uniaxial, Biaxial, and Triaxial Loading or Unloading Regimes
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Paper presented at the ISRM European Rock Mechanics Symposium - EUROCK 2017, June 20–22, 2017
Paper Number: ISRM-EUROCK-2017-043
.... Conclusions of those experiments are: increased intermediate principal stress increases the strength of rocks, and that under very high pressures this effect can be substantially suppressed. However, experimental studies through RTE, CTE or RTC experiments are very rare, as particularly extensional tests meet...
Proceedings Papers
Multiphysics Laboratory Tests for Modelling Gravity-Driven Instabilities at Slope Scale
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Paper presented at the ISRM European Rock Mechanics Symposium - EUROCK 2017, June 20–22, 2017
Paper Number: ISRM-EUROCK-2017-019
... measured, including porosity, permeability, and elastic wave velocity. Mechanical characterization was then performed using a combination of uniaxial, tensile, and triaxial experiments on as-collected samples and samples thermally stressed in the laboratory. The obtained results reveal MEGT to have a high...
Proceedings Papers
Microcracking Process as a Base of Shear Rupture Mechanism of Extreme Dynamics
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Paper presented at the ISRM European Rock Mechanics Symposium - EUROCK 2017, June 20–22, 2017
Paper Number: ISRM-EUROCK-2017-087
... Abstract Dynamic shear ruptures (up to intersonic velocities) have been observed in brittle materials from micro to macro scales including earthquakes. Earthquake laboratory experiments have revealed two key features of extreme ruptures: intensive microcracking in the rupture tip...
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