Stability analysis of vertical excavations in hard rock by integrating a fracture system into a PFC model

Abstract

This paper presents an implementation of a comprehensive engineering approach to the analysis of the stability of vertical excavations in rock. This approach relies in the generation of discrete fracture systems to better capture the structural complexity of the rock mass. The resulting fracture system is consequently linked into a distinct element stress analysis. The particle flow code was selected as it potentially allows greater flexibility in representing a fracture system. In the first example a 3D fracture system was linked into a 2D PFC model. Although this has allowed for an improved quantification of stress structure interaction it necessitated important simplifications which may not be necessarily appropriate. These have been overcome by providing a complete integration of a 3D fracture system to a 3D PFC model. This will potentially lead into a design tool that adequately account for the stress structure interaction on the stability of vertical or near vertical excavations in hard rock. KEYWORDS Fracture system Mining, Vertical excavations, Particle flow code CITATION Hadjigeorgiou J, Esmaieli K, & Grenon M. Stability analysis of vertical excavations in hard rock by integrating a fracture system into a PFC model. Tunnelling and Underground Space Technology (2009) 24(3), 296-308.

Numerical analysis of the failure process of soil–rock mixtures through computed tomography and PFC3D models

“…The failure process of SRM during a biaxial test was simulated using PFC3D (Cheng et al 2010). A complete integration of the 3D fracture system, which linked the 3D fracture system into a 2D PFC model, was provided, and a 3D SRM model was subsequently formed to analyze the stress-structure interaction on the stability of vertical excavations in hard rock (Hadjigeorgiou et al 2009). The relationship between moisture content and the process of loosening deposit forming in the mud-rock flow was revealed by PFC2D (Hu et al 2010).…”

Review of the study on deformation, failure and the mesomechanisms of rock-soil mixture (RSM)

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Influence of Microscopic Parameters on the Stress-Strain Relation in Rocks

“…However, these studies mainly consider the parameters such as particle bonding strength, particle friction coefficient, and particle bond strength. Stiffness properties among mesoscopic particles affect the force between particles features affecting the macroscopic appearance of the material [20,21]. ese properties include parallel bond stiffness ratio, particle contact modulus, and parallel to the compressive modulus of elasticity [22][23][24].…”