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Three-dimensional FDEM numerical simulation of failure processes observed in Opalinus Clay laboratory samples 被引量:10
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作者 Omid Mahabadi Patrick Kaifosh +1 位作者 Paul Marschall Tim Vietor 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2014年第6期591-606,共16页
This study presents the first step of a research project that aims at using a three-dimensional (3D) hybridfinite-discrete element method (FDEM) to investigate the development of an excavation damaged zone(EDZ) ... This study presents the first step of a research project that aims at using a three-dimensional (3D) hybridfinite-discrete element method (FDEM) to investigate the development of an excavation damaged zone(EDZ) around tunnels in a clay shale formation known as Opalinus Clay. The 3D FDEM was first calibratedagainst standard laboratory experiments, including Brazilian disc test and uniaxial compression test. Theeffect of increasing confining pressure on the mechanical response and fracture propagation of the rockwas quantified under triaxial compression tests. Polyaxial (or true triaxial) simulations highlighted theeffect of the intermediate principal stress (s2) on fracture directions in the model: as the intermediateprincipal stress increased, fractures tended to align in the direction parallel to the plane defined by themajor and intermediate principal stresses. The peak strength was also shown to vary with changing s2. 2014 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting byElsevier B.V. All rights reserved. 展开更多
关键词 Three-dimensional(3D) hybrid finitediscrete element method(FDEM) intermediate principal stress Discrete element methods True triaxial behaviour Failure envelope
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