| dc.description.abstract | The research uses PFC3D (Particle Flow Code in three dimensions)
numerical software to simulate the engineering characteristics of fractured
rock masses, and introduces the discrete element method (Discrete Element
Method) using radial expansion from the Finite Element Method (Finite
Element Method) mesh size concept. Radial Expansion), used to quickly
check the characteristics of large-scale rock foundation engineering, with
orientation of discontinuities, fracture intensity (P32), diameter of
discontinuities (D), Fisher constant (κ) these parametric research and
analysis of the optimal orientation of the rock foundation.
Conclusions: (a) The greater anisotropy ratio, the greater difference
in strength between different orientation. (b) Both dip and dip-direction of
discontinuities have an anisotropic influence on the bearing capacity. (c)
When D and P32 increase, the bearing capacity decreases. (e) When the rate
of bond replacement is over 50% in simulation, the SRM will fail. (f) The
coefficient of variation will increase with greater D、 P32、κ, it presents
the uncertainty of the bearing capacity has the positive relationship with
anisotropy ratio(AR). (g) When the long axis of the foundation is
orthogonal to the strike of the discontinuity, the bearing capacity will
increase and the anisotropy will decrease compared to other orientation. | en_US |