| dc.description.abstract | This paper uses Particle Flow in 3 Dimension (PFC3D) and FracMan to establish a simulation program of synthetic rock mass (SRM) for orthotropic cases. Besides, this paper discusses the effects of fracture intensity (P32), sampling volume, fracture diameter (D) and Fisher constant (κ) on the mechanical properties and the variation of orthotropic rock mass. In addition, this paper conducts numerical simulations for transversely isotropic rock mass and compares them with previous research results. Based on the SRM numerical simulation results, the fracture intensity, sampling volume, fracture diameter and Fisher constant all have strong effects on the mechanical properties and variation of rock mass. The normalized mechanical properties of rock mass decrease with the increase of fracture intensity and fracture diameter. Conversely, the variation increase with the increase of fracture intensity and fracture diameter. In addition, the coefficient of variations (CV) of mechanical properties of rock mass are inversely proportional to the squared root of sampling volume, which conforms the central limit theorem. As the Fisher constant increases, the mean value of the normalized mechanical properties of rock mass will increase, the coefficient of variation will decrease, and the rock mass behavior will gradually change from isotropic to anisotropic. Finally, the composition law of orthotropic rock mass via conducting a series of numerical tests, and the compliance matrix was validated with the positive definite of Amadei (1987). | en_US |