The engineering rockmass is often prone to compression, therefore how to
establish a fracture criterion to reflect the rockmass compression
failure is vital. Take the rockmass with one oblique crack for instance,
the mechanical behavior of the oblique crack face closure and friction
sliding under uniaxial compression is firstly analyzed, and then the
Kolossoff-Muskhelishvilli stress function of the rockmass under uniaxial
compression is established based on the complex stress functions. Next,
the calculation methods of the stress intensity factor (SIF) K
and three T-stress components at or near the crack tip
considering three kinds of crack parameters (e.g. geometry parameter,
friction strength parameter and deformation parameter) are obtained.
Thirdly, the improved maximum tangential stress (MTS) criterion is
obtained considering T-stress and three kinds of crack
parameters. Finally, the relevant experiments done by other researchers
are adopted to verify the improved MTS criterion. Meanwhile, the effect
of γ, the crack normal stiffness k and
shear stiffness k, and the crack friction
coefficient f on the wing-crack initiation angle are discussed
with the parametric sensitivity analysis.