... 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...

... 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...

... 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...

... 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...

... is seen from which four long boreholes were drilled sub-parallel to orientation of minimum horizontal compressive stress. The middle borehole (Figure 1, blue line) serves as hydraulic testing borehole and was drilled to a total length of 28.40 meter, down dipping −4°. The rest of monitoring boreholes were...

... coal seam procedia engineering 191 Reservoir Characterization support load gateroad longwall face metals & mining displacement borehole measurement station stress change vertical convergence deformation reservoir geomechanics stress component convergence gateroad 371222 Probe...

... for instance, this paper will be limited to rock mechanics problems associated with Enhanced Geothermal Systems. 2. Enhanced Geothermal System (EGS) 2.1. Principle and brief history The principle of a geothermal installation can be schematically represented by two boreholes. From the first borehole...

..., whereupon two boreholes were drilled and fitted with instrumentation so as to determine and characterise an ideal location for the potential injection of a radioactive tracer into the fractured rock massif. A number of methods were employed in order to describe the rock system and the hydraulic flow field...

... and are acquired at different scales and from different support shapes and dimension (1D, 2D). We present a 3D modelling approach combining data from borehole logs, outcrop trace maps and tunnel walls mapping. It is applied to the Äspö site in Sweden, for which a large database is available, containing tens...

... Abstract In-situ stress measurements were carried out under a 290m overburden in the Kamaishi mine in Iwate Prefecture of Japan. The geology of the measurement site consists of granite. The Hydraulic Fracturing (HF) technique and the Compact Conical- ended Borehole Overcoring (CCBO) technique...

... 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...