... 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...

... 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...

... 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...

... 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...

... fracturing aperture borehole specimen hydraulic fracture bedding plane permeability Wellbore Design strength initiation pipe fluid viscosity particle model Rock Mechanics and Rock Engineering: From the Past to the Future Ulusay et al. (Eds) © 2016 Taylor & Francis Group, London, ISBN 978-1...

... of the borehole wall surface. The analysis reveals that the primary contact stress decreases with the Young's modulus of the rock mass and increases with the borehole diameter and installation pump pressure. The primary contact stress is dominant in the total contact stress in soft and weak rock, while in hard...

... ABSTRACT: This project was supported by Turkish Coal Enterprises and was carried out at the Ilgin-Konya open pit coal mine. Horizontal displacements along boreholes were measured using an inclinometer at 0.5 m intervals. In the same boreholes, vertical displacements were assessed at 3 m...