A 3D Grain-Based Model for Simulating Heterogenous Properties of Salt Rock Under Uniaxial Compression Test
- Huan Li (University of Chinese Academy of Sciences / Institute of Rock and Soil Mechanics) | Chunhe Yang (Institute of Rock and Soil Mechanics) | Haina Zhang (University of Chinese Academy of Sciences / Institute of Rock and Soil Mechanics) | Jie Yang (Chongqing University / School of resources and environmental sciences) | Yuhao Zhang (University of Chinese Academy of Sciences / Institute of Rock and Soil Mechanics) | Yue Han (Chongqing University / School of resources and environmental sciences) | Tianfu Xue (Chongqing University / School of resources and environmental sciences) | Changkun Ma (University of Chinese Academy of Sciences / Institute of Rock and Soil Mechanics)
- Document ID
- American Rock Mechanics Association
- 53rd U.S. Rock Mechanics/Geomechanics Symposium, 23-26 June, New York City, New York
- Publication Date
- Document Type
- Conference Paper
- 2019. American Rock Mechanics Association
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- 8 since 2007
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ABSTRACT: A 3D grain-based model (3D-GBM) based on the tessellated Voronoi technology is proposed in this current work using the three-dimensional particle flow code (PFC3D). A dimensionless heterogeneity index is introduced to quantitatively express the spatial distribution of grain shape and size. A continuous calibrated parameter strategy was performed to examine the micro-parameters of the 3D-GBM through the QianJiang salt rock. The effect of geometrical heterogeneity caused by the shape and arrangement of the grains on the responses of stress-strain curves, strength characteristics, microcracking behavior associated with failure modes is investigated. The simulated results show that the 3D-GBM can capture the strength properties and deformation behavior associated with the failure modes of salt rock. This model provides an alternative and promising method to deeply investigate the micro-mechanical response at the grain size, deepening our understanding of the mechanical properties of salt rocks in underground gas storage during the static load.
Salt rock, which can be considered as a perfect medium for energy storage due to its low permeability (Stormont and Daemen, 1992) and excellent ductility (Yang et al., 1999), is a typical polycrystalline material with inherent microstructures cemented by polyhedral-like-shaped grains (Fig. 1), exhibiting significant heterogeneity in geometric fabric.
Numerous investigations have been demonstrated that geometrical heterogeneity induced by the shape, arrangement and even distribution of the grains has a significant effect on the strength characteristics and deformation responses associated with microcracking behavior of the salt rocks (Li et al., 2017; Liu et al., 2017; Muller et al., 2018). Thus, heterogeneity is a vital factor that should be a prevailing concern when studying the mechanical behavior of salt rocks at a micro perspective.
Though, traditional methods including different compression tests and non-invasive techniques (such as X-ray computed tomography (CT) scanning (Mazumder et al., 2016), scanning electron microscope (SEM) (Fonseka et al., 1985), have been enjoying success for several decades, and are capable of capturing the microcracks, dilatation and even strain softening behaviors. However, there are still significant limitations in the further quantitative expression of mechanical properties of granular rocks.
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