Grain-based DEM modelling of mechanical and coupled hydro-mechanical behaviour of crystalline rocks

• DOI: 10.1016/j.enggeo.2024.107649
• Publication Date: 2024-07-27T01:45:12Z
• Authors: Lie Kong; Junlong Shang; Pathegama Gamage ...; Bing Qiuyi Li; Yuqi Song; Wuqiang Cai; Fanlin Ling
• Keywords: Geomechanics; Lead (geology)

Mineral grains serve as the basic units of rocks. Understanding rock materials at grain-scale level allows us to unveil underlying fundamental mechanisms, thereby facilitating development and innovation engineering solutions. This is especially significant amidst current energy sustainability transition, where many geomechanics applications require a shift towards more scientific, environmentally friendly, sustainable approaches. The Discrete Element Method (DEM) numerical tool that has been widely used understand micro-mechanisms associated with deformation cracking. Here, through reviewing past 50 years research, we present comprehensive state-of-the-art review mechanical coupled hydro-mechanical (H-M) DEM models tailored elucidate behaviour crystalline We first examine logic, principles, capabilities existing conceptual grain-based (GBMs) identify crucial aspects also assess their adaptability, then introduce capable Hydro-GBM model specifically developed for simulation Finally, discuss selection micro parameters, which an important longstanding challenge DEM, accordingly, provide some strategies could alleviate challenge. It found parallel bonded contact would lead deficiencies in capturing real cracking behaviours previous GBM suffer from limitations reproducing cracks modes (tension shear cracks). Fluid-driven early stage appears be appealing tool. emphases reconsiderations micro-parameter selections are necessary. In review, argue modelling H-M should based on appropriate considerations of: (a) solid phase (mechanical), (b) fluid flow (hydro), (c) parameters both hydro aspects.