... that the latter is more likely. This conclusion is justified by the observation that pore pressure drops occur significantly ahead of the tunnel face which is not the case in elastic numerical simulations. Pore pressure measurements in the far field, where failure processes are unlikely to occur, can only partly...

... out in the construction stage, in which the design is rationally verified and modified by observations/measurements. Moreover, the ground conditions ahead of a tunnel face must be predicted for efficient and safe tunnel construction. The authors have examined effective prediction methods to the ground...

... Abstract The better the information on the rock mass and its fracture system, the better is the basis for any rock mechanical decision that is required during the excavation process. While in conventional tunnelling free view to the tunnel face is available, possibilities are limited...

... section Reservoir Characterization strength tunnel face rock mass parameter interpretation shrestha tunnel metals & mining displacement convergence rock mass Deformation Characteristic support pressure Kaligandaki Headrace Tunnel Innovations in Applied and Theoretical Rock Mechanics...

... semi-analytical model forepole element Engineering Reservoir Characterization 13th international congress grouted umbrella oke Diederich ground condition excavation support system rock mechanics isrm13 tunnel face Umbrella Montreal nomenclature Innovations in Applied and Theoretical...

... displacement Time Period unsupported model excavation b-sery model displacement Longitudinal deformation profile a-sery model tunnel face boundary rock mass tunnel Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor & Francis Group, London, ISBN 978-0-415-80444-8...

... core extrusion represents a sufficient but not a necessary condition for large convergences to occur after excavation. theoretical analysis prediction Anagnostou cantieni 2011 displacement tunnel face Upstream Oil & Gas axial strain diameter extrusion Reservoir Characterization...

... ABSTRACT Continuous monitoring of the ground condition ahead of tunnel face is essential unless there are sufficient geotechnical data available for subsea tunneling. With the results of numerical analysis for the excavation of depression and weakness zone, displacement vector orientation...

... addresses those aspects and bridges between all participating parties in order to create a common mindset among them. Reservoir Characterization seismic exploration data mechanical property rock mass Fault Zone engineering view layout dickmann geology precast segment tunnel face tunnel...

... curve. Reservoir Characterization ground reaction curve equilibrium displacement tunnel face Construction Procedure basic principle rigid lining support pressure stress state excavation rock mass lining correct interpretation tunnel reservoir geomechanics radial pressure failure...

... Upstream Oil & Gas karst tunnel prediction geological prediction water-bearing structure tunnel face fracture construction geological hazard source comprehensive prediction karst cave hazard tunnel Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor...

... prediction system for geological conditions ahead of tunnel faces, which is composed of long-interval, middle-interval, and short-interval prediction subsystems. The applicability of those subsystems is verified with actual field data. Upstream Oil & Gas correlation tunnel face Modeling...

... ABSTRACT Stability of tunnel face is important at weak rocks. Steel pipe umbrella arch have very important application in recent years. Umbrella arch constitutes an artificial shell to make tunnel face stable thereby contributing tunnel face safety. It is seen in applications and researches...

..., and the delay in excavation of tunnels as compared to instrumentation results. Also the area around the tunnels affected by the tunnel face is investigated. 1 INTRODUCTION To resolve the traffic jams, the underground train (subway) is the first solution. Among the various methods for the construction...

...-dimensional model, tensile stresses oriented parallel to the tunnel axis developed in the shotcrete, which may cause local cracking. This phenomenon is mostly pronounced when shotcrete is applied close to the tunnel face, and for thin shotcrete layers. A three-dimensional model is required to fully assess...

... and three the viewing direction of the camera within the object co-ordinate system. Reservoir Characterization Upstream Oil & Gas metals & mining spatial reasoning Artificial Intelligence Computer Vision bench face tunnel face application rock mass characterisation Imaging...

... and the porphyrite of the New Red as well as the layers of the Middle Bunter. The two tunnel tubes were driven by the shotcrete method within appr. 10 months. With four tunnel faces, maximum performances totalling appr. 30 m/d were attained. Additional, supplementary demands on the safety conception, resulting from...

... of the rock mass around a tunnel face via an array of standard anchor rods. These rods contain 3D-geophones at their tips and can be readily installed during excavation work. A further innovative component of the system is the newly developed high-power repetitive source for application in hard rock...

... shotcrete lining tunnel face lining compressive loading construction materials numerical analysis consideration excavation material model reservoir geomechanics hydration process shotcrete chemical shrinkage loading shotcrete constitutive model creep ground-shotcrete interaction shrinkage...

..., and the drill energy coefficient is also calculated from the drill logging data that is carried out using the probe hole ahead of the tunnel face. In this study, a new, geostatistical simulation-based method is proposed for the automatic prediction of the rock properties ahead of the tunnel face with good...