Damage mechanics of jointed rock in tunnelling

  • Qiang Yang
  • Gunter Swoboda
  • Dean Zhao
  • Franz Laabmayr


In this chapter, an anisotropic damage model is established in strain space to describe the behavior of jointed rock masses under compression-dominated stress fields. The research work focuses on rate-independent and small-deformation behavior during isothermal processes. It is emphasized that the damage variables should be defined microstructurally rather than phenomenologically for jointed rock masses, and a secondorder “fabric tensor” is chosen as the damage variable. Starting from it, a one-parameter damage-dependent elasticity tensor is deduced based on tensorial algebra and thermodynamic requirements; An equivalent state is developed to exclude the macroscopic stress/strain explicitly from the relevant constitutive equations. Finally, some numerical results are worked out to illustrate the mechanical behavior of this model. In order to eliminate the complexity and arbitrariness in the formulation of phenomenological anisotropic model, systematic micromechanical analysis has been done on damage elasticity, damage evolution laws and micromechanics of different types of microdefects.


Jointed Rock Damage Variable Free Energy Function Jointed Rock Mass Continuum Damage Mechanic 
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Copyright information

© Springer-Verlag Wien 2003

Authors and Affiliations

  • Qiang Yang
    • 1
  • Gunter Swoboda
    • 2
  • Dean Zhao
    • 2
    • 3
  • Franz Laabmayr
    • 4
  1. 1.Department of Hydraulic EngineeringTsinghua UniversityChina
  2. 2.Institute for Structural Analysis and Strength of MaterialsUniversity of InnsbruckAustria
  3. 3.Department of Civil EngineeringLanzhou Railway InstituteChina
  4. 4.Laabmayr and Partner Consulting EngineersAustria

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