| dc.description.abstract | This paper employs 3-D Particle Flow Code and FracMan to simulate synthetic transversely isotropic rocks masses with different dip angles (β) and focuses on the uniaxial compressive strength (UCS), Young’s modulus (E50), failure modes, and coefficient of variance (CV) under unconfined compression test and triaxial test. And we verify our simulation results to criterion. This paper also presents the effect of sampling volume and fracture parameters such as fracture intensity (P32), fracture diameter (D), and Fisher constant (κ) on the mechanical behavior and variation of fractured rock. Furthermore, a new anisotropic index for the anisotropic degree of transversely isotropic rocks has been developed and presented.
Based on the numerical simulation results:(1) The relationship between the mechanical properties of transversely isotropic rocks and β presents the U-typed relation. However, the relationship between CVs of the mechanical properties and β presents the inverted U-typed relation. (2) In addition, the crack development is affected by dip angle of fracture, and we generalize four failure modes under unconfined compression test. The failure modes are sliding or split across inherent fracture mode, sliding along inherent fracture mode, split along inherent fracture mode, and mixed mode, respectively. (3) The coefficient of variations (CV) of uniaxial compressive strength and Young’s modulus are inversely proportional to the squared root of sampling volume, which conforms the central limit theorem. The result is the same as isotropic. (Tien et al., 2017) (4) The anisotropic of mechanical properties and variations decrease with increase of confining pressures under triaxial test, which shows the negeative relation. The simulation results almost agree with results of Tien and Kuo Criterion (2001). (5) The fracture diameter (D), fracture intensity (P32), and the Fisher constant (κ) all have significant effects on the mechanical behavior and variation. The anisotropic of mechanical properties and variations increase with the increase of D, κ, and P32, which shows the positive relation. This paper also proposed a anisotropic ratio (AR) and established the relationship among AR, D, κ, and P32 of transversely isotropic rocks. | en_US |