... product metals & mining tensile stress China strength gob-side roadway roof tensile strength procedia engineering 191 roadway roof Procedia Engineering 191 ( 2017 ) 89 97 Available online at www.sciencedirect.com 1877-7058 © 2017 The Authors. Published by Elsevier Ltd. This is an open...

... rock mass Upstream Oil & Gas calculation tensile stress rock mechanical design design load case gas storage cavern zapf temperature development natural gas storage withdrawal operation Staudtmeister stress development Withdrawal Rate salt cavern Rock Mechanics and Rock Engineering...

... monsonite Ghamgosar toughness Erarslan hydraulic fracturing Brazilian test specimen fracture toughness test tensile strength Upstream Oil & Gas fracture toughness investigation rock type mechanics Engineering Rock mechanics tensile stress Laboratory Result Rock Mechanics...

... Artificial Intelligence Einstein hydraulic fracturing concentration laboratory Reservoir Characterization structural geology wing crack mechanism Coalescence reservoir geomechanics Upstream Oil & Gas shear specimen bridge area joint tip tensile stress loading tensile...

... installation cable anchor stability mechanisation support unit long resin bolt wall stability tensile stress South Africa Rock Mechanics and Rock Engineering: From the Past to the Future Ulusay et al. (Eds) © 2016 Taylor & Francis Group, London, ISBN 978-1-138-03265-1 Understanding the influence...

... strength tensile strength value komurlu reservoir geomechanics Brazilian test diameter markide stress distribution ISRM specimen tensile strength uniaxial tensile strength tensile stress rock specimen rock material strength value critical zone Rock Mechanics and Rock Engineering: From...

... by the presence of microfractures and microfissures in the rock. For the specimens tested in direct tensile test, failure occurred near the radius of the dumbbell shape sample due to stress intensity factor. Therefore, direct tensile stress should be re-calculated by considering stress intensity factor. Since...

... in practice with geo-materials (Liao et al. 1997). The Brazilian test involves splitting a disc loaded by a compressive line load that generates a tensile stress inside the disc causing failure. However, it has long been evident that the concentration of shear stresses that develop in the vicinity...

.... Therefore, for a given condition, the ultimate resistance of concrete against bursting force (in compression) for a convex joint is higher than that for a flat joint. However, splitting tensile stresses in concrete of radial joints are higher in double convex joints; consequently, a more steel ratio...

... frequency Oscillation amplitude evaluation Artificial Intelligence anchor length input parameter application optimization problem geomechanics coefficient amplitude material parameter foundation plate Upstream Oil & Gas Rock mechanics roof settlement tensile stress...

... global instability. This rotation creates local dilation; the resistance to dilation by the surrounding rock is equivalent to generation of a force dipole. The latter creates additional tensile stress acting on the plane of future localization zone, which enables rotations of adjacent grains. Thus a zone...

... model is needed. A new stress-strain constitutive model is then sug- gested by the authors and is shown in Figure 2. In this model, a stress level of yield, aB, exists. Before the values of tensile stress exceed aB, the stress-straIn curve in tension is elastic and the deformation mod- ulus equals Ec...

... Magnitude natural gas storage biaxial compression test plug tensile stress vertical stress interface Eurock 2005 -Impact of Human Activity on the Geological Environment - Konecny (ed) © 2005 Taylor & Francis Group, London, ISBN 04 1538 042 1 Mechanical behaviors of concrete plug in storage rock...

... rooms are excavated 4.25 Fig. 5 Contours of crJ after all rooms are excavated The contours of GJ show that after the excavation, tensile stresses appear in the roof and in part of the country rocks, with the area of the tensile stress region increasing as excavation progresses. However, the tensile...

... of the joints, changed from 0° to 120° with an increment of 15°. The failure mechanism monitored by visual inspection and magnifier to detect cracks initiation. In all of the tested samples curvilinear cracks called wing cracks initiated at the joints tips due to high tensile stresses concentration this wing...

...: There is an increasing demand for underground openings for energy storage projects (i.e. CAES and SMES Projects). And the openings for these projects are subjected to high internal pressures ranging between 4 to 8 MPa. Since such high internal pressures will cause high tensile stresses in rock masses which are generally...

... borehole tensile stress rock mass compression deformability displacement test core determination axis tensile strength Upstream Oil & Gas variation assessment loading interpretation diameter initial stress flat jack diagram biaxial chamber means Eurock '93, Ribeiro e...