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Acta Mechanica Solida Sinica

, Volume 19, Issue 3, pp 275–282 | Cite as

Study on damage bifurcation and instability of rock-like materials

  • Maotian Luan
  • Zhongchang Wang
  • Qing Yang
Article

Abstract

The critical bifurcation orientation and its corresponding hardening modulus for rock-like geomaterials are derived by considering the effect of stiffness degradation and volumetric dilatancy under the assumption of isotropic damage. The dependency of the localized orientation on the degree of damage and initial Poisson’s ratio of rock is examined and the bifurcation behavior of the uniaxial compression sample under the plane-stress condition is compared with that under plane-strain condition. It is shown that the localization orientation angle intimately depends on both the initial Poisson’s ratio and degree of damage for the rock sample under the uniaxial compression condition. As the initial Poisson’s ratio or degree of damage increases, the orientation angle of the plane on which localization tends to be initiated gets to decrease. At the same time, the localization orientation angle of a rock sample under the plane-stress condition is larger than that under the plane-strain condition.

Key words

damage degradation maximum hardening modulus bifurcation orientation of localization rock-like materials 

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics and Technology 2006

Authors and Affiliations

  1. 1.State Key Laboratory of Coastal and Offshore EngineeringDalian University of TechnologyDalianChina
  2. 2.Institute of Geotechnical Engineering, Scool of Civil and Hydraulic EngineeringDalian University of TechnologyDalianChina

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