... geotechnical system; seismic monitoring device and nano-seismic array for detecting microseismic events on the cliff slope. The main objective of the experiment at this test site is to investigate precursors of rock mass failures by coupling remote and local sensors. The integrated monitoring system...

... features. Orientated thin sections were prepared to identify the mineralogical composition. Furthermore, the growing influence of confining pressure from 0.1 to 2.5 MPa on rock strength was analyzed. 1. Introduction Laboratory experiments of rocks were conducted to determine geomechanical properties...

... experiment of coal seam. Then by use of the test, the development law of mining overburden separated strata is studied, and the space-time corresponding rule of the surface subsidence and overburden separated strata is analyzed. And on this basis, we find the relationship between the surface subsidence...

... investigation procedia engineering 191 Reservoir Characterization Upstream Oil & Gas rock specimen inner structure high-speed abrasive water jet water jet experiment upper base strength property tensile strength lower base preparation Procedia Engineering 191 ( 2017 ) 703 710 Available...

... 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...

... water-fracs at the enhanced geothermal system site Gnβ-Schönebeck, Germany. Then, an in situ experiment at Äspö Hard Rock Laboratory is summarized to bridge the gap between laboratory core testing and wellbore-size hydraulic fracture treatments in hard rock. Three different fluid injection schemes...

... 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...

... about the rock testing are given in Brenne et al. (2013) and the main results are listed in Table 1. 3 METHODS 3.1 Experimental methods Sleeve frac experiments very similar to the hollow cylinder burst tests from Clifton et al. (1976) and Abou-Sayed (1978) were conducted with the rocks from our sample...

... or semi-underground structures was been initiated by the authors as a part of an international joint project between Japan and Turkey (Aydan et al. 1999a). This experimental programme has been continued by the authors. Besides uniaxial creep experiments, a series of Brazilian and 3-point bending...

... of transformation of one regime into the other. Our work is aimed at find- ing the criterion that defines realization of different deformation regimes. 2 EXPERIMENTAL METHOD The scheme of our experiments was the classical fric- tional slider-model .The granite block 8 × 8 × 3 cm3 in size slid along the interface...

... Polished 16 19 15 27 31.8 30.1 Saw-cut 28 35 23 28 31.0 29.0 Figure 12. Plot of experimental results for polished mar- ble contacts together with some failre criteria for rock discontinuities. shear experiment under a normal stress of 5 MPa. From the comparison of the table The friction angle of polished...

.... Little existing literature addresses these issues. Upstream Oil & Gas gravity-driven deformation characteristic passive zone physical model test Reservoir Characterization foliation dip angle experiment characteristic rock sphere Artificial Intelligence failure characteristic plane...

... were covered by silicone rub- bers to make the moisture exchange take place in/out from top and bottom surfaces as shown in Figure 2. 2.3 Experimental procedure In order to evaluate the effect of water supply from the bottom of a sample, two cases of drying experiments under different boundary...

... between the excavation methods. At 2010 the Research Tunnel was expanded to its current size and profile (Fig. 1) for hosting the Posiva's Spalling Experiment (POSE) within the ONK-TKU-3620 (Johansson et al. 2014, Valli et al. 2014). From the ONK-TKU-3620 tunnel, one specific 9 m × 2 m area...