...7th International Symposium on ln-51tu Rock stress May 10-12,2016, Tampera, Finland Johansson & Raasakka (ads) ISBN 978-951-758-806-1 ISSN 0356-9403 STRESS FIELD ASSESSMENT FOR DETERMINING THE LONG-TERM RHEOLOGY OF A GRANITE ROCK MASS Bruno Figueiredo (bruno.figueiredo@geo.uu.se) Uppsa/a University...

... 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...

...711llntemational Symposium on ln-5ilu Rock Slress May 1D-12, 2016, Tampere, Finland Johansson & Raasakka (ads) ISBN 976-951-758-606-1 ISSN 0356-9403 HYDRAULIC FRACTURING STRESS MEASUREMENTS IN FRACTURED ROCK MASS AT A HYDROELECTRIC PROJECT *DS Subrahmanyam, **G Shyam, **K Vamshidhar, **Vikram...

... Abstract The construction of the Romaine-3 surface powerhouse requires an important excavation of approximately 98 m (left to right bank direction) by 64 m (upstream-downstream direction) and 80 m deep in the rock mass. The water intake tunnel as a length of approximately 1.8 km including...

... containers increases the in situ rock stress during disposal time. The thermal stress increase was modelled using thermo-mechanical modelling. The numerical codes used to establish the effects of heating on the in situ stress field are outlined, together with the rock mass parameters, in situ stress values...

... in a loop. In construction of a loop tunnel in a rock mass under anisotropic in-situ stress conditions, the in-situ stress orientation and excavation direction are expected to affect the convergence associated with excavation-induced stress redistribution. This suggests that it is possible to achieve...

... by the tunnelling industry. However, there is an intrinsic risk associated with tunnel construction by using this type of machines because of limited access to the excavated walls for observation of ground conditions. This will be more challenging when machine passes through rock mass with squeezing behaviour...

... Characterization Upstream Oil & Gas metals & mining extensometer Finland Johansson onkalo test site rock mass modulus test site ritala rock mass reservoir geomechanics displacement stress state change Rock stress principal stress linear regression excavation international symposium 7th...

... since the current state of stress at a site or an area is the end product of an often long series of past geological events. An obvious situation in which stresses are discontinuous is at contacts between rock masses of different lithology and where rocks are intersected by one or several sets of joints...

... on the stability of slopes before the expanded mining. Reservoir Characterization acoustic emission specimen rock mass vertical stress Upstream Oil & Gas Measurement Site reservoir geomechanics core orientation technique Csiro fracture MPa stress value acoustic emission test stress state...

... industry in mineral mining and so on. In addition, fluid flow and its pressure distribution in jointed rock masses are important so as even in the case of rock masses with widely spaced and very tight joints, for most rock types, the hydraulic conductivity due to the joints is much larger than...

... measurement geostress rock mass tectonic stress deformation soft rock Deformation Characteristic mining area Upstream Oil & Gas deep-buried tunnel high stress Crown fracture tunnel Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Study...

... decomposition module is relatively smaller than the corresponding result obtained through the polar decomposition module. 1 INTRODUCTION As the depth of excavated tunnels increases, the geostress value is increasing and deformations of the surrounding rock masses are generally large, such as roof caving...

... The natural stress tensors field (NSTF) refers to a continuous volume forming the crust, in where every infinitesimal point is loaded by stress actions coming from the current or past activity of the crust. The estimation of NSTF in rock mass is a central concern within the geosciences, for understanding...

... of crystalline igneous and metamorphic rocks. Hydro jacking tests serve the objective of identifying an increase in transmissivity of the rock mass with water pressure to define the upstream limit of pressure tunnel lining. A study of different test results demonstrates, for depths less than 150 m...

... of the cavern or tunnel, the design of the support, as well as the construction method used. The large number of factors that influence the in situ stresses in rock masses make of its characterization a difficult task. These factors include lithological and deformability heterogeneities, topography...

... ABSTRACT: Wave propagation process and shallow spallation of rock slope under the dynamic loads is numerically simulated to investigate the applied incident compressive stress wave on the fracturing process and failure induced in the rock mass. Heterogeneity of the rock materials is taking...

... 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...

... in-situ stress deformation in-situ rock stress cross section orientation horizontal in-situ stress high rock stress rock mass tunnel Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Tunnel stability and in-situ rock stress M. Lu, E. Grøv, K.H...

... ABSTRACT: Static vertical pendulums have been installed in mines and caves in Central Europe since 2007. The two dimensional optical measurement of tilt of rock mass and continuous full digital on-line evaluation of results makes possible to detect small tilt of the surroundings...