The Continuum Voronoi Block Model for simulation of fracture process in hard rocks

Abstract

In this paper, a numerical model is presented to represent the fracture process in hard rocks based on a pseudo‐discontinuum method called the Continuum Voronoi Block Model (CVBM). To validate this tool, numerical models for one Brazilian test, one unconfined compression test, and multiple triaxial compression tests with different confining stress were calibrated to match laboratory test results for Creighton granite. The model proved robust and matched the following macro‐properties: crack initiation (CI) stress, (CD) stress, peak strength, tensile strength, Young's Modulus, and Poisson's ratio. The calibrated model served as a basis for a sensitivity study to analyze how micro‐properties influence the rock's macroscopic responses. From the sensitivity study, a calibration methodology was proposed, which shall facilitate the use of the CVBM in future works.

Applications of the Discrete Element Method for Gas Hydrate-Bearing Sediments: Recent Advances and Perspectives

“…Two types of algorithms have been proposed to generate different particle shape models. One is to represent the shape using a single particle, such as a 2D ellipse, 3D ellipsoid, 2D polygon, and 3D polyhedron. − The other is to create a specific shape with several overlapping disks or spheres called clumps. This method is widely used to represent the irregular particles of granular materials. − …”