... oil from a 60m thick calcareous reservoir rock. This research aims to numerically investigate the stability of excavations together with the initiation, formation and propagation of fracture networks between the fan-shaped boreholes and around typical twin excavations using FLAC 3D . It is shown...

... borehole blanco mera granite fracture propagation tensile strength Mechanics and Rock Engineering, from Theory to Practice IOP Publishing IOP Conf. Series: Earth and Environmental Science 833 (2021) 012187 doi:10.1088/1755-1315/833/1/012187 Hydrofracturing tests on granite samples using a true...

... stress shadow and redistribution effects, rock heterogeneity and discontinuities. We subjected the specimens to a true-triaxial stress state using servo-controlled hydraulic pistons for external loading. High viscosity fluids were injected into parallel boreholes at controlled volume rates with metering...

... to integrate borehole and surface structural data in a 3D structural model. This 2 stage workflow, led to a set of preventive and remedial measures that allowed the continuation of the production the last ten years and will ensure the continuation of the production for, at least, other ten years...

... Abstract A new gradient elasticity model is employed to discuss strain gradient effects and its ability in predicting size effects on an elastic rock mass with microstructure, around an axisymmetric borehole under internal pressure and remote isotropic compressive stress. The constitutive...

... Abstract The conceptual model of the rock-soil (and future shaft) interface was confirmed (so far not rejected) using data from investigation boreholes. The location of a depression in rock (a likely deformation zone) was indicated and confirmed using borehole data. Wave-washed deposits (upper...

... Abstract The emergency services receive a notice on 13/01/2019 that a 2-year-old boy has fallen into a borehole in Totalán, (Málaga, Spain). After almost 13 days of unusual and overwhelming engineering and solidarity efforts his body is recovered. This was an extraordinary and unusual...

... characterization rock engineering environmental science 833 tunnel theory axis matrix equation information lining excavation borehole Mechanics and Rock Engineering, from Theory to Practice IOP Publishing IOP Conf. Series: Earth and Environmental Science 833 (2021) 012167 doi:10.1088/1755-1315/833/1...

... dimeter of 11m and includes a section with a horizontal radius of curvature tighter than 400m. This paper describes (i) the desk studies and the geological survey which provided the basis for an additional ground investigation plan, (ii) the results of the additional boreholes, in situ test and laboratory...

... Abstract In-situ stress is a natural stress existing in rock mass. As an important basic parameter, accurate acquisition of in-situ stress is of great significance to the theoretical research and engineering application of rock mechanics. In the in-situ stress testing under the deep-borehole...

... Village consisted of a rock pit filled with water and two surrounding rings of boreholes. COMSOL Multiphysics 5.2 ® was used to create a model in which the temperature of the rock pit was used as the heat source and the heat propagation through the surrounding rock as the output to which the measured...

... Abstract Relatively accurate data regarding the temperature distribution in a rock mass can be obtained from measurements carried out in short boreholes drilled directly into mine workings. Such thermal field measurements were undertaken in selected mine workings in all active mines...

... these purposes there is prevention from air filtering from the mine working into degassing boreholes. The sealing quality estimates the efficiency of the preliminary coal beds degassing. There is a problem of the air inflow into methane withdrawal point through the rock mass. A well-known solution addressing...

... borehole drilled from a tunnel at 410 m depth. The facture process is mapped by an extensive array of acoustic emission and micro-seismic monitoring instruments. Results from three water-injection tests in Ävrö granodiorite indicate that the fracture breakdown pressure in tendency becomes lower...

... Design paulatto borehole Reservoir Characterization Upstream Oil & Gas criteria evaluation permeability test fracture flow in porous media Fluid Dynamics sune carstensen procedia engineering 191 Copenhagen Limestone upper copenhagen limestone hydraulic fracturing frequency enrico...

... monitoring. A total of five probes were installed on the roof rocks of the main gate. Two compact conical-ended borehole overcoring probes were installed to obtain the pre-mining full stress tensor and afterwards three compact conical-ended borehole monitoring probes were installed to continuously monitor...

... relevant tasks in in-mine hydraulic fracturing is creating parallel cracks oriented across the axis of the well. In-seam boreholes with this type of fracture system can be used for coal bed methane production, sealing of degassing boreholes, controlled collapse of the roof and other applications...

... Abstract The nuclear disposal concept is based on compacted bentonite barrier placed into a borehole in the host rock. In crystalline rock, one of the issues is a non-uniform saturation of bentonite caused by inhomogeneity of the rock, typically the flow being concentrated to fractures. We...

... before the Tohoku-oki earthquake [2–6]. In-situ stress measurements were performed using the Compact Conical-ended Borehole Overcoring (CCBO) technique [7]. The CCBO technique is the one of the suggested methods of the ISRM [5]. reservoir geomechanics Earthquake measurement station stress...

... deformation modulus procedia engineering 191 stress-strain state metals & mining hydraulic jack mechanical property rock mass stress condition reservoir geomechanics impermeable stratum berezniki potash deposit-2 pillar rib pillar borehole experimental study saliferous rock Procedia...