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Keywords: rock mass
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Proceedings Papers
Stress Field Assessment for Determining the Long-Term Rheology of a Granite Rock Mass
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-006
... 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...
Proceedings Papers
Rock Stress Considerations in Underground Mines
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-014
... 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...
Proceedings Papers
Hydraulic Fracturing Stress Measurements in Fractured Rock Mass at a Hydroelectric Project
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-026
... 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...
Proceedings Papers
Rock Mass Stress Relief at Shallow Depth Due to Surface Powerhouse Excavation
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-022
... 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...
Proceedings Papers
Thermally Induced Rock Stress Increment and Rock Reinforcement Response
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-023
... 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...
Proceedings Papers
Design and Verification of Support System for Underground Excavations Under Anisotropic Stress Conditions
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-024
... 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...
Proceedings Papers
Evaluation of Ground Reaction and Convergence Relative to Possibility of Entrapment for Shielded Tunnel Boring Machines
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-060
... 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...
Proceedings Papers
Stress State Change Monitoring Using Displacement Change Measurements
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-055
... 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...
Proceedings Papers
Stress Measurement And Rock Excavation At Skaland Mine, Norway
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-024
... 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...
Proceedings Papers
Tunnel Stability And In-situ Rock Stress
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-004
... 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...
Proceedings Papers
Static Vertical Pendulum - Apparatus For In-situ Relative Stress Measurement
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-039
... 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...
Proceedings Papers
Measurements And Application of In-situ Stress And Related Rock Mechanics Parameters At a New Type of Diversion Hydroelectric Project In Southwest China
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-079
... 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...
Proceedings Papers
Estimation of In-situ Stress State At the Maximum Depth of the Jinping Tunnels, China
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-055
... 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...
Proceedings Papers
Feasible Study of the Application of Stress Measurement In Mining Engineering to Seismic Monitoring System
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-111
... 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...
Proceedings Papers
Estimation of Minimum Insitu Stress By Hydrojacking Method Case Study of Siah Bisheh Power Plant
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-016
... 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...
Proceedings Papers
Features of In Situ Stress In a Crystallized Batholith And Its Influence On the Rockbursts of Tunnels
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-051
... 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...
Proceedings Papers
Relationship Between Instantaneous Strength In Laboratory And Creep Strength By Numerical Simulation of Soft Rock In Deep Site
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-090
.... 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...
Proceedings Papers
Variability of In Situ Rock Stress
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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
In-situ Stress Measurement And Rockburst Possibility In Deep Tunnel At a Hydro-power Station
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-056
... 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...
Proceedings Papers
Application of a New Stress Measurement Device In Underground Marble Quarrying, a Case Study
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Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-081
... 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...
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