Study on constitutive model of fractured rock masses by using
statistical strength theory
By using the basic principle of the continuous damage mechanics as a
reference, together with the statistical strength theory based on the
Weibull distribution, a new constitutive model of fractured rock masses
for deep underground engineering is proposed. In this model, a new
definition of the fracture degree Ft has been proposed for the first
time, which can quantitatively describe the fracturing process of a
fractured rock mass. Based on the results of laboratory tests and
numerical simulations for fractured rock mass specimens, the
constitutive model with different fracture degrees are verified.
Moreover, the applicability of two yield criteria (the M-C and D-P
criteria) for describing the mesoscopic strength of rocks is analyzed.
Finally, the effects of the random distribution parameters on the
constitutive model are discussed in detail. The results show that the
theoretical results agree well with the experimental and numerical
results, and the constitutive model with the D-P criterion is better
than the model with the M-C criterion.