... and the difference between two methods was confirmed to be minimal. Upstream Oil & Gas inflection point Rock stress DRA method vertical stress orientation Finland Johansson Symposium stress estimation Reservoir Characterization overburden stress MPa situ stress ed-j isbn 978-951-758-1kl6-1...

..., with RQD 100 values filtered from the data. Results indicated that the in situ stress field is interacting with brittle deformation zones unless an unrealistically high fault plane cohesion of 6 MPa is considered. With more realistic parameters interaction is apparent up to a depth of ca. -350 m...

... thermally reinforcement rock stress increment Reservoir Characterization deposition Raasakka reinforcement type reservoir geomechanics central tunnel Finland Johansson MPa Rock stress temperature increase rock reinforcement stress state repository international symposium rock...

... Finland Johansson MPa variation shear wave velocity international symposium Rock stress mica gneiss specimen Upstream Oil & Gas show variation specimen gneiss specimen stress-strain curve Reservoir Characterization Raasakka loading step foliation plane loading step 8 7th...

... by using 6 different methods. The closure pressures from 4 methods were consistent with the actual minimum horizontal principal stress ( S h = 5 MPa). Considering the effect of experimental system flexibility, the measured reopening pressure and theoretical reopening pressure were compared...

... pressure test instrument gauge Magnitude Rock stress international symposium strain change circumference Upstream Oil & Gas borehole MPa situ stress pressure test 7th lntematlonal Symposium on ln-5Hu Rock Stress May 10-12, 2016, Tampere, Finland Johansson & Raasakka (eds) ISBN 978-951...

... projects. This study concerns the rock-burst problems encountered in the deepest and larger of the Carrara Marble underground quarry: the Carlone quarry. reservoir geomechanics strength stress state Carlone quarry Upstream Oil & Gas quarry MPa Reservoir Characterization rockburst...

... Reservoir Characterization displacement strain gauge rosette excavation mass condition excavation profile rock mass failure MPa Sintef indication Upstream Oil & Gas instability tunnel procedure rock mass host rock Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group...

... with numerical simulation and regression analysis to synthetically analyze the ground stress field at engineering sites. The results show that the direction of maximum principle stress at engineering sites is N33 52 W, the elevation is N26 39 W, the value is 7.35 8.16 MPa; that the maximum principal stress...

..., geological disasters and engineering stability (Wu 1997&Cai 2000). Most parts of the deep-buried underground tunnel project in this paper lie in high stress area. Reservoir Characterization mudstone MPa stress measurement Upstream Oil & Gas deep-buried tunnel Tunnel Project reservoir...

... from the most recent hydraulic stress measurements at the Olkiluoto site, Finland (Fig. 1), are presented. Upstream Oil & Gas strength MPa hydraulic fracturing orientation borehole Reservoir Characterization tensile failure criterion borehole wall shear stress determination...

.... zonal isolation ground surface Ito MPa reservoir geomechanics Reservoir Characterization Upstream Oil & Gas well integrity flow rate borehole hydraulic fracturing test interval compliance application straddle packer deep rock stress measurement stress measurement borehole wall...

... of the Qinling extra-long tunnels, severe rockburst occurred in several sections, where the initial subhorizontal stress is about 20 MPa 30 MPa and the overburden is no less than 1000 m. The magnitude of the in situ stresses are related to the rock mass s capacity of storing initial geostatic stress. Large...

... becomes an unignorable issue. Figure 1. Section of dam site and collocation of measure- ment boreholes. Table 1. Measurement results by hydrofracturing method. Borehole Depth downhole Pb Pr Ps H H h Azimuth of H number (/m) (MPa) (MPa) (MPa) (MPa) (MPa) (MPa) ZK27 37.7 6.0 3.2 1.5 2.8 2.1 1.9 47.0 9.5...

..., friction angle, tensile strength and dilation angle vary after yielding occurs, as a function of hardening or softening parameters related to the plastic shear or ten- sile strains (Hajiabdolmajid et al., 2002). Two plastic models were run with an initial uniaxial compressive strength ( c) of 153 MPa...

.... In-situ stress measurements results. Principal stress Vertical Depth/ Principal Value/ stress/ m stress MPa Azimuth/ Obliquity/ MPa 560 1 27.2 93 5 15.1 2 16.3 2 3 3 15.0 238 83 Figure 2. Discal drill core. In general, it is rare to obtain the geostress test data and the core discing at the same...

... & Brown failure envelop parameter (Hoek & Brown 1982); b) rock joints: j, cj = residual friction angle and cohesion from direct shear tests, b = basic friction angle, JRC = joint roughness coefficient, kn normal stiffness, ks shear stiffness. a) ci Et t tb ci i mi (MPa) (GPa) (MPa) (MPa) 81 ± 10 60...

... & Gas experiment Probe rock specimen reservoir geomechanics pressure shell principal stress coupling area MPa loading fracture Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Development of borehole-jack fracturing technique and in situ...

... Characterization distribution characteristic MPa circular tunnel energy dissipation quantity reservoir geomechanics energy dissipation excavation rockburst stress level Engineering characteristic tunnel excavation principal stress difference stress condition tunnel Rock Stress and Earthquakes...

... floor are locate in order: Shanfuqing aquifer at 30.4 m, with 2 3 MPa hydraulic pressure; Daqing aquifer at 66 m, with 5 MPa hydraulic pressure; and Ordovician limestone aquifer at 104.1 m, with 9 MPa hydraulic pressure. 3 IN-SITU STRESS MEASUREMENT 3.1 The principle of in-situ stress measurement...