Modeling the Effects of Heterogeneity and Anisotropy on the Excavation Damaged/Disturbed Zone (EDZ) |
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| Authors: | S H Wang C I Lee P G Ranjith C A Tang |
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| Institution: | (1) School of Resource and Civil Engineering, Northeastern University, Shenyang, P.R. China;(2) School of Civil, Urban and Geosystem Engineering, Seoul National University, Seoul, Korea;(3) Department of Civil Engineering, Monash University, VIC, Australia;(4) Department of Engineering Mechanics, Dalian University of Technology, Dalian, P.R. China |
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| Abstract: | Summary When modeling the mechanical behavior of underground excavations, it is necessary to include the influence of the rock mass
characteristics on the Excavation Damaged/Disturbed Zone (EDZ). In this paper, the Realistic Failure Process Analysis code,
RFPA, is used to model the extent of the EDZ. The inhomogeneous characteristics of rock at the mesoscopic level are included
by assuming that the material properties of the constituent elements conform to a Weibull distribution; the anisotropy is
incorporated as a transversely isotropic medium; the non-elastic characteristic is simulated via an elastic damage-based constitutive
law. A finite element program is adopted as the basic stress analysis tool. In this study, a notable feature is that no a
priori assumptions need to be made about where and how fracture and failure will occur – cracking can take place spontaneously
and can exhibit a variety of mechanisms when certain local stress conditions are met. The deformation and failure process
of anisotropic rock around excavations of different geometries is analyzed, and compared to experimental tests, showing similar
fracture patterns. Additionally, the effect of confining stress and of different material layers is modeled and discussed.
It is found that the model clearly illustrates that fracturing, both initiation and propagation, occurs as a combination of
the stress concentrations and weakness planes introduced via the transverse anisotropy – which could represent either foliations
or ubiquitous joint sets.
Correspondence: Dr. Shuhong Wang, Box 265, School of Resource and Civil Engineering, Northeastern University, Shenyang 110004,
P.R. China |
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| Keywords: | : Damage mechanics Excavation Damaged/Disturbed Zone (EDZ) fracture process inhomogeneity anisotropy realistic modeling |
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