Grain-Level Numerical Simulations for the Effective Elasticity of Weakly Cemented Sandstones
文献类型：期刊论文
| 作者 | Xu, Xiaoyi |
| 刊名 | ACS OMEGA
 |
| 出版日期 | 2023-09-08 |
| 页码 | 12 |
| ISSN号 | 2470-1343 |
| DOI | 10.1021/acsomega.3c03802 |
| 英文摘要 | Weakly cemented sandstones are characteristic of loose-bonding contacts, large porosities, and high-clay contents. This study presents a discrete element method (DEM)-based numerical study for the effective elasticity of such rocks that mainly depends on the mechanical behavior of intergranular contact regions. The DEM scheme employs a set of normal and shear springs to phenomenologically describe the mechanical behavior of intergranular finite-sized cements defined by three morphological parameters: cement thickness, bonding radius, and grain radius. Applications to two digital models established in terms of contact-bonding and distant-bonding modes, respectively, where spherical quartz grains are randomly packed together with adding cements under the specified confining pressure, are compared with the theoretical predictions by the contact-bonding and distant-bonding cement theories, which demonstrates a good agreement generally for small contact widths, small contact thicknesses, and large-magnitude moduli, especially for the effective shear modulus. Applications to a series of artificial sandstone samples made in terms of different proportions of quartz grains and clays (a mixture of epoxy and kaolinite) under loose compaction for weak cementation demonstrate a good agreement with ultrasonic measurements. Numerical investigations for the micromechanical characteristics (differential stress fields, force chains, and fabric tensors) of artificial samples subject to applied axial strains demonstrate that the strong mechanical behavior of weakly cemented sandstones tends to appear inside the cohesive aggregates of stiff grains because of their relatively large sizes with loose compaction. |
| 资助项目 | The author would like to thank the editors and anonymous reviewers for their insightful and constructive comments that have helped to improve the paper. The research is supported by the Major Project of Inner Mongolia Science and Technology, China (grant n[2021ZD0034] ; Major Project of Inner Mongolia Science and Technology, China[B18055] ; 111 Project[B18055] ; China Universityof Petroleum (East China) |
| WOS研究方向 | Chemistry |
| 语种 | 英语 |
| WOS记录号 | WOS:001070128000001 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/39548]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Xu, Xiaoyi |
| 作者单位 | Chinese Acad Sci, Inst Rock & Soil Mech, Wuhan 430071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Xiaoyi. Grain-Level Numerical Simulations for the Effective Elasticity of Weakly Cemented Sandstones[J]. ACS OMEGA,2023:12. |
| APA | Xu, Xiaoyi.(2023).Grain-Level Numerical Simulations for the Effective Elasticity of Weakly Cemented Sandstones.ACS OMEGA,12. |
| MLA | Xu, Xiaoyi."Grain-Level Numerical Simulations for the Effective Elasticity of Weakly Cemented Sandstones".ACS OMEGA (2023):12. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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