... techniques to estimate the in-situ stress state at various sites are presented and discussed. Then, the stress state estimates in a country-level are described. Upstream Oil & Gas Reservoir Characterization fault striation striation crust reservoir geomechanics Watanabe horizontal stress...

... with Asia, it is meaningful to research the today's stresses inside the mountains. Upstream Oil & Gas stress state Southeast Tibet Plateau hydraulic fracturing horizontal stress maximum horizontal stress finland johanmon ed-j isbn 978-951-758-1kl6-1 issn reservoir geomechanics Finland...

... reservoir geomechanics Upstream Oil & Gas Raasakka rail transportation orientation Tampere city centre Rock stress Reservoir Characterization ground transportation stability analysis horizontal stress Rock Stress Measurement international symposium parking cavern construction...

... the stability of underground openings are also presented. For instance, a wide opening can be excavated in a rock mass where the horizontal stresses are high enough. In a case of extremely high horizontal stresses, the stability of the roof could be improved by increasing the width of the opening. The basic...

... condition of high anisotropy, in other words, where the ratio of the maximum and the minimum horizontal stresses is large. Among the seven tested in situ stress conditions, the occurrence of an earthquake under the stress condition at the time of forebulge in front of the ice cover is found to produce...

... applications where an overcore measurement is not conducted because it allows the initial stress state in the rock to be estimated. Reservoir Characterization stress invariant anzi strain cell Artificial Intelligence Finland Johansson reservoir geomechanics variation horizontal stress situ...

... horizontal stress Symposium stress measurement Upstream Oil & Gas Raasakka Tampere excavation Reservoir Characterization in-situ stress tampere rantatunneli highway tunnel project displacement Finland Johansson Rock stress in-situ rock stress international symposium santalahti tunnel...

... to the jointing geometry since the sufficiently high normal stress will prevent the rock block from falling even the geometry is not favourable. In some situations the high horizontal stress plays a crucial role in maintaining stability of tunnels and caverns, which is particularly true for underground openings...

... the thickness is about 8m and then mudstone roof with great variety in thickness, the traditional bolts (cables) supporting technique can t solve the problem that no stable upper rock strata are available to suspend. In addition, the influence of horizontal stress to the entries stability is never consid- ered...

...; the increasing rate of horizontal stresses is larger than that of vertical stress in shallow sites, and gradually decrease as the depth increases. 1 INTRODUCTION Coal measures are extremely complicated geological bodies. When compared with other geological materials, they have two distinct characteristics...

... will hinder the construction program and add the construction cost. Therefore, basing on the mechanics analysis of linear elastic rock, the formula is established among the maximum and minimum horizontal stress with the tectonic stress coefficient, considering that horizontal principal stress is made up...

... be represented by the relationship: The difference between the author s measurement data and Browns maybe caused by the thicker Qua- ternary alluvial deposits in Kailuan mining area. The relation between maximum horizontal stress and depth is statistically nonsignificant. From -630 m to -650 m, the maximum...

... 10.05 09.12. 318.32 319.12 11.97 7.72 23 26 332.29 333.09 10.81 6.86 362.00 362.80 12.30 7.95 of 300 380 m in borehole ZK2, the maximum hori- zontal principal stress was 13 14 MPa, with slightly higher value in the bottom section. The minimum horizontal stress in every measuring section was obvi...

... in situ horizontal stresses are kept in intact gneiss, with unaxial strength more than 45 MPa and overburden more than 200 m. The large subhorizontal in situ stress mainly plays the role of 2 during tunnel excavations in the section of gneiss with severe rockbursts occurred. The initial stress...

... the results from in-situ stress measurement. Zhu Huanchun andTao Zhenyu summarized the features of maximal and minimal horizontal stress variation with depth in the world. Brown obtained the ratio of vertical and horizontal average stress to vertical in-situ stress and its variation with depth. Mary Lou...

... with expected effects, and controlled the floor heave effectively. Keywords: Soft rock roadway floor heave deformation mechanism horizontal stress swelling soaking effect 1 INTRODUCTION When the excavation of roadway has been advanced, the balance of in-situ stress situation of rock mass was destroyed, which...

... ABSTRACT: A hybrid method for constraining all three principal in situ stresses and their directions around vertical boreholes at great depths is described. It involves hydraulic fracturing tests for estimating the minimum horizontal stress and its direction. The vertical stress is computed...

... is set up, which plots out 64800 grid cells and 69972 nodes. The range of the entire model is 480 m(X axis) × 231.9 m(Y axis) × 300 m(Z axis). The vertical stress is calculated with gravity stress of rock mass (16 MPa) and compression hydraulic pres- sure (9 MPa); the horizontal stress of rock stratum...

... horizontal stress in-situ stress principal stress Northeast Sichuan Sichuan inversion fracture Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Inversion of marine in-situ stress of northeast Sichuan and its influence on horizontal well completion...

... throughout the world and they have proved that at the depth of 1100m below the surface, the average horizontal stress value within the hard dolomite deposit is greater of about 50 pct. than the vertical stress value estimated to be equal to 29.7MPa. Despite of a limited number of such measurements...