... Abstract A case study is presented to show how stress field information can be used to assess the long-term rheological behaviour of an equivalent gao-material. The example concerns a granitic rock mass at the km 3 scale where an underground hydropower scheme including a new 10 km long power...

... of time dependent material properties on the present day stress field. These results imply that an understanding of the viscoelastic properties of sedimentary formations is necessary for extrapolating measured surface deformations to basement rocks in domains of very slow tectonics. Introduction...

... Rock stress stress field seismicity principal stress Abstract Knowledge of stresses is an important component of any geomechanical design task. This requirement is accentuated in deep mines, where stresses not only lead to fracturing around excavation boundaries, but include induced...

... 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...

..., combinations of HF and HTPF tests provides a very robust method for determining the complete stress field. It supposes that stress is a linear function of the spatial coordinates of the points where measurements have been conducted. But this combination of HF and HTPF tests is not adapted to sedimentary rock...

... segment. In this paper, we employ the three dimensional viscoelastic finite element model of Xianshuihe fault and its surrounding region to explore the relation between fault slip rate and stress field, even the seismic distribution difference, according to the optimal boundary condition. And finally...

... fracture borehole San Andreas stress field Upstream Oil & Gas constrain borehole failure Hmax breakout Magnitude Wellbore Design stress magnitude stress state perturbation principal stress determination drilling-induced tensile fracture Rock Stress and Earthquakes Xie (ed.) © 2010...

... types of in-situ stress fields. Depth, geological structures and rock properties are the main factors affecting in-situ stresses. Complicated geological conditions result in obvious scatter in testing data. However, the magnitude of in-situ stresses basically increase with the depth in the general trend...

...Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Second fine inversion of regional in-situ stress field considering the excavation disturbance effects of pilot tunnel G.Q. Chen State Key Laboratory of Geohazard Prevention and Geoenvironment...

... years, most of which poses underground powerhouse. These plants are gen- erally located in high canyon regions. The topogragh of mountain of projects location has a great impact on the distribution character of initial stress field. In the current engineering, the depth of the direct over- burden rock...

... formation of the eastern Paris Basin. This stress profile outlines the relaxation of shear stress in a 190m thick clayey formation that results in a strongly non linear stress variation with depth. It demonstrates that today's stress field at this location does not depend on tectonic stresses but on active...

... ABSTRACT: According to the stress state and force source character, the recent tectonic stress field of China is preliminary divided into four classes. Among them, there are two first order districts, four second order districts, five third order districts and twenty-six fourth order districts...

... 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...

... of underground structures, it is important to incorporate information on the in situ stress field not only for design purposes, but also for the safe con- struction and operation of the underground structure. Generally, the scale of the structure will determine the stress measurement needs for quantitative under...

... caused by the influence of faults. The horizontal principal stresses normalized by vertical stress vary spatially. The magnitude of stress field appears to be inversely correlated with the density of regional scale faults, suggesting that a stress relief due to faulting may be one of the major factors...

... of ground support needed to maintain a safe working environment for miners. Using hollow inclusion stress cells, researchers obtained 13 in situ stress measurements from 6 coal mines Kailuan mining area, China. According the analysis of the measurement data, the characteristic of in-situ stress field...

... formulas of stress field is deduced, so that the correctness of the process and the superiority of the boundary element back-analysis method are verified, taking the calculation of a coal mine roadway an instance. 1 INSTRUCTION Earthquake is the swift vibration of the crust in a short time and one...

...Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Analysis of in-situ stress field by using a visual BP neural network Li Yongsong, Ai Kai & Liu Yuankun Yangtze River Scientific Research Institue, Wuhan, China ABSTRACT: A method of In-situ stress...

... field soil layer shaft rupture structural geology tectonic stress Crustal Block mining area gravity shaft wall Fault Zone in-situ stress field in-situ stress yanteng-xuhuai mining area Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8...

...Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Research on in-situ stress field simulation of coal and gas outburst mining area with 3D finite element method Xu Jiang, Peng Shou-Jian, Yang Hong-Wei, Zhang Dan-Dan & Liu Dong Key Laboratory...