... spatial variations may help ascertain the loading mechanism at the origin of the measured stress field as well as the long-term rheological behavior of the equivalent gao-material under consideration. 85 IN SITU STRESS MEASUREMENTS Hydraulic tests 7th International Symposium on ln-51tu Rock stress May 10...

... to climatic variations. They involve periods that range from thousands to hundreds of thousands years. This mechanism generates time- dependent shear stresses in soft formations and explains overpressures observed in the very low permeability argillite layer. Effects of pressure solution may be modeled...

... characteristics found in the typically complex geological environments of deep mines. Interaction between the stress field and geological structures results in a natural scatter in both stress magnitude and orientation. In some mines, these variations can be significant, and are important to characterize...

... 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...

... of the borehole. Multiple measurements of axial strain available from most types of strain based overcoring instruments are averaged to provide a single valued estimate of the axial strain. Any variations in axial strain are typically assumed to be a result of measurement error or variability in rock behaviour...

... 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...

...7th lntematlonal Symposium on ln-5Hu Rock Stress May 10-12, 2016, Tampere, Finland Johansson & Raasakka (eds) ISBN 978-951-758-606-1 ISSN 0356-9403 IN SITU MEASUREMENTS OF STRESS RELATED ELASTIC MODULUS VARIATION USING THE ANZI STRAIN CELL K.W. Mills KMills@sct.gs SCT Operations Ply Ltd Australia...

... 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...

... 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...

... 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...

... 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...

.... The noise level and anomalous deformation development 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 field has wider than regional character...

... stress orientation present-day stress state Upstream Oil & Gas quaternary fault variation stress data stress field Magnitude stress relief stress condition principal stress Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Present-day...

... axes yields the quantitative borehole acoustoelasticity. Lastly, we discuss the intrinsic anisotropy of the borehole on the stress-induced velocity anisotropy around the borehole in detail. 1 INTRODUCTION It has been shown in many experiments that the stress induced wave velocity variations...

..., 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...

... 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...

... slip in this paper, in which 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...