Three-dimensional FDEM numerical simulation of failure processes observed in Opalinus Clay laboratory samples

作     者：Omid Mahabadi Patrick Kaifosh Paul Marschall Tim Vietor 

作者机构：Geomechanica Inc.90 Adelaide St W Suite 300 Toronto ON M5H 3V9 Canada National Cooperative for the Disposal of Radioactive Waste (NAGRA)Wettingen Switzerland 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2014年第6卷第6期

页      面：591-606页

核心收录：

学科分类：081401[工学-岩土工程] 08[工学] 0814[工学-土木工程] 

主　　题：Three dimensional(3D) hybrid finitediscrete element method(FDEM) Intermediate principal stress Discrete element methods True triaxial behaviour Failure envelope 

摘      要：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.
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