A review of numerical techniques approaching microstructures of crystalline rocks. (June 2018)

• Record Type: Journal Article
• Authors: Zhang, Yahui; Wong, Louis Ngai Yuen
• Is Part Of: Computers & geosciences. Volume 115(2018)
• Page Start: 167
• Page End: 187
• Publication Date: 2018-06
• Subjects: Rock mechanics -- Numerical techniques -- Crystalline rock -- Micro-structure; Environmental policy -- Periodicals; 550.5
• DOI: 10.1016/j.cageo.2018.03.012
• Languages: English
• ISSNs: 0098-3004

Abstract

Abstract: The macro-mechanical behavior of crystalline rocks including strength, deformability and failure pattern are dominantly influenced by their grain-scale structures. Numerical technique is commonly used to assist understanding the complicated mechanisms from a microscopic perspective. Each numerical method has its respective strengths and limitations. This review paper elucidates how numerical techniques take geometrical aspects of the grain into consideration. Four categories of numerical methods are examined: particle-based methods, block-based methods, grain-based methods, and node-based methods. Focusing on the grain-scale characters, specific relevant issues including increasing complexity of micro-structure, deformation and breakage of model elements, fracturing and fragmentation process are described in more detail. Therefore, the intrinsic capabilities and limitations of different numerical approaches in terms of accounting for the micro-mechanics of crystalline rocks and their phenomenal mechanical behavior are explicitly presented. Highlights: A focused review of numerical methods for simulation of crystalline rocks. Especially focusing on the grain-scale structure. Strengths and limitations of four numerical methods from a geometrical perspective. Particle-based, block-based, grain-based, and node-based methods are reviewed. Grain geometry, deformation capability, cracking mechanisms, progressive failure.