... development of the plastic zone temporarily bigger than the final equilibrium state far behind the face. Therefore the displacement is obliged bigger than that 2-D (plane strain) analysis indicates, because the plastic strain once experienced around the face never vanishes even after the equilibrium...

... ABSTRACT: In conventional elasto-plastic numerical analyses of underground structures, such as tunnels, caverns, shafts and trenches at a great depth, the structures never collapse, even though large plastic zones appear around the openings. In reality, however, tunnel crowns often collapse...

... pore pressure cohesion weathered rock layer multiphase flow rainfall intensity rainfall finite difference method interface shear resistance force Fluid Dynamics weathered soil layer plastic zone slope stability friction angle Upstream Oil & Gas lower slope greater impact...

... normalized displacement boundary condition plastic zone means plastic radius tunnel section rock mass deformation displacement tunnel face excavation normalized plastic radius numerical model Tunnel Stability eurock 2012 Convergence Confinement Method Extending the Convergence...

.... The main goals of the design were the limiting of the cavern displacements and plastic zones. Laboratory tests and in-situ stress measurements were conducted to obtain the material parameters and the stress condition in the rock. The large variance in the model parameters obtained from the field...

...Rock Mechanics in Civil and Environmental Engineering Zhao, Labiouse, Dudt & Mathier (eds) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-58654-2 Investigation of plastic zones around circular tunnels in strain-softening rock mass S.L. Wang, C.G. Li, H. Tang & X.R. Ge State Key laboratory...

... be the sinkhole. A footing reinforces the ground and stops a sinkhole outside right on the periphery of the structure footprint. Photos of actual sinkholes and FEM simulation graphs are given to support these statements. periphery soil dia cavity periphery plastic zone project design Reservoir...

... acting, as well as substantial deformation occurring due to the spread plastic zone. On the other hand, results of the 3-dimensional numerical analysis methods according to various strikes and dip angles of the coal seam indicate that the behaviour of the supported tunnel is influenced more...

... the extent of the plastic zone and tunnel convergence. The verification of the proposed theory is made by the base friction model test. RESUME: Dans Ie cadre d'une conception rationelle du soutien des ouvrages à l'aide de la Nouvelle Methode Autrichienne de Percement des Tunnels, un modele theorique...

... axisymmetric analysis plastic zone ground transportation ground reaction curve lining rock mass temporary lining stress release pre-support deformation construction ground reinforcement excavation face deformation Eurock '96, Barla (ed.) © 1996 Balkema, Rotterdam. ISBN 90 5410 843 6...