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1-17 of 17
Keywords: variation
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Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-006
... & Gas normal stress small flat jack test Raasakka Rock stress hydraulic fracturing ln-51tu rock stress borehole stress field stress measurement rock mass US government variation Finland Johansson determination Magnitude international symposium fracture 7th International Symposium...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-008
... that this stress is not related to tectonics but to pressure solution effects activated by pore pressure transients. These transients develop in the natural fracture system that affects limestone formations and are linked to climatic variations. They involve periods that range from thousands to hundreds...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-001
... Upstream Oil & Gas variation stability Reservoir Characterization McKINNON Finland Johansson lntematlonal symposium orientation geological structure seismic event ln-5hu rock stress stress condition stress measurement interaction structural geology information characteristic...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-007
... Abstract In this paper we use three-dimensional spherical shell finite element model of power-law creep mechanism, to analyze the stress field variation in china mainland caused by the brittle failure of Longmenshan fault, during 5.12 Wenchuan earthquake. We establish a local coordinate system...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-028
... Reservoir Characterization axial gauge axial strain Upstream Oil & Gas variability instrument reservoir geomechanics variation axial compensation gauge situ stress Symposium orientation borehole axial strain compensation compensation Drilling strain change stress relief...
Proceedings Papers
M. H. B. Nasseri, Mahdi Sehizadeh, Sheng Hua Ye, R. Paul Young, J. William Flynn, Johannes Suikkanen, Topias Siren
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-049
... with foliation planes in failed specimens. Variation of seismic wave velocities measured along three orthogonal axes as a function of the loading path show that compressional and shear wave velocities measured parallel to foliation planes are higher than perpendicular to such planes characterizing...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-035
... broadly consistent with the long term state of stress in the rock. This paper presents measurements of this phenomenon from the in situ pressure tests, biaxial pressure tests, and laboratory core tests, and discusses the implications of modulus variation for interpretation of the in situ stresses from...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-039
... of the pendulum and its development in time. The noise level and anomalous deformation devel- opment shows the value of relative stress in the surroundings of the pendulum. The correlation of deformation between distant stations shows existence of stress variations that they are not of local origin. The stress...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-114
..., possibly indicating hydrostatic pressure. However, the density of regional scale faults appears to be distinct between the low and the high stress regions (Fig. 1). In order to quantitatively assess the variation of fault density in different regions, we measured total cumu- lative length of faults...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-036
... that the stress- induced wave velocity variations in rocks are about 10 2 10 3/MPa, which are much more than that of metallic materials (Hirao & Ogi 2003, Johnson & Rasolofosaon 1996, Nur & Simmons 1969, Pao et al 1984, Thurston & Brugger 1964, Toupin & Bernstein 1961,Vega 2003).Therefore, acoustoelasticity...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-001
..., discontinuities and free faces. A computer simulation of inhomogeneity-induced stress variation is included. The variation of stress with depth is made clearer through the use of the first stress invariant. Rock discing in boreholes at the JinPing II site is illustrated. Computer modeling of the rock mass...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-112
... and minimal stress variation with depth. After the removal of gravitational effects from in-situ stress, we analyzed the statistical characteristics of stress variation with depth and tectonic stress orientations in the sub-regions. The results of our study may bear great referential implication...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-107
... model of Mohr-Coulomb (MC) and strain hardening & softening (SS) were taken as a comparison, variation of geologic factors, such as dip angle, strength, thickness and depth of rock stratum, were done. It was verified that bedding slip formed by the application of horizontal in-situ stress...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-108
... and the 2008Wenchuan Ms8.0 earthquake. We calculated both values of each sequence, analyzed some statistic characters of these values, compared them, and drafted some features based on the calculation and comparison. By comparing the temporal variation of b value with the moment cumulating, we found that almost each...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-122
... ABSTRACT: The thermo-mechanical strength distributions of the lithosphere underneath Chinawere obtained by 3-D crustal velocity model of China, local isostasy equilibrium constrained geothermal inversion, and 4-layered rheological model of lithosphere. Map of the lateral strength variation...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-123
... ABSTRACT: In 1960s, J.S. Lee (Si-Guang Li) pointed out that, tectonic stress and its variation have tight relationship with earthquake, and unraveling the stress variation process by in-situ stress measurement is key to realize earthquake prediction. On the basis of Dr. Lee's speeches andmy...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-130
... ABSTRACT: The observed anomalous tilt time development of static horizontal pendulum and anomalous time development of variations (noise) before earthquakes could be the basis for possible prediction of earthquakes. This case study showed the behaviour of rock mass before main earthquakes...