...: 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...

... 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...

... 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...

... 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...

... 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...

... 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...

... (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...

... 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...

... 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...

... 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...

... 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...

... 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...

... 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...

... 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...

... 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...

... 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...

.... 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...

.... 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...

... 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...

... 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...