... 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...

... 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...

... hydraulic fracturing normal stress hydroelectric project rock mass Upstream Oil & Gas Finland Johansson proceedings fracture stress measurement principal stress Reservoir Characterization flow rate borehole Symposium Injection Rate critical pressure reservoir geomechanics...

... rock mass stress relief 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 heating on the in situ stress field are outlined, together with the rock mass parameters, in situ stress values, radiogenic temperatures and reinforcement structures. This is followed by a study of the temperature and stress evolution during the repository's operational period and the effect...

... in November 2005; as of the end of June 2015, the shafts and galleries have been completed to a depth of 350 m. The tunnel at the 350-m level is laid out 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...

... 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...

... 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...

... 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 with resolution of tens of nanoradians or deformation...

... the scheme design of the air-cushion surge tank for the hydroelectric project, the hydraulic fracturing technology has been adopted to define the In-situ stress and related rock mechanics parameters of rock mass around the high pressure cavern, and utilizes the data of stress measurements, together...

... of the boreholes, core discing, and failing to be fractured, will be encountered in the stress measurements. The phenomena, including the brittle failures of the intact rock mass and core discing are directly related to high stress level. Hence, abundant information can be obtained by interpretation...

... Mining Engineering rock mass metals & mining construction deformation initial stress feasible study Engineering Earthquake roadway stress field equation Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Feasible study...

... water injection to surrounding rock mass. One of the convenience borehole methods for in-situ stress measurement is hydrofracturing. Hydrojacking is the simplified approach for minimum in situ stress which is important method for precise steel and concrete lining boundary. Hydraulic testing...

... of the Qinling extra-long tunnels, severe rockburst occurred in several sections, where the initial subhorizontal stress is about 20 MPa 30 MPa and the overburden is no less than 1000 m. The magnitude of the in situ stresses are related to the rock mass s capacity of storing initial geostatic stress. Large...

.... That is, instantaneous strength, creep strength, and long-term strength of unstable soft rock with strong rheological properties will decrease in turn, but their values are closed one another. 1 GENERAL INTRODUCTIONS Universal creep features of rock masses with increasing depth have been recognized in coal mining...

..., 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...

... with concentrated stress near the chamber wall. Elastic strain energy stored in the rock mass will release suddenly with impetuous unstability damage for rock mass when stress exceeds breaking strength of rock mass. Broken rocks will eject on the chamberwall or a lot of rocks will outburst to generate violent blast...

... the ground control, which is not a com- mon systematic activity in quarry practice, is driven by the specific geomechanical characteristics of the exploited rock mass at the quarry sites and the exploita- tion technique (Hoek & Brown 1982, Brady & Brown 1985, Iannacchione & Prosser 1997). Therefore...