Isotropic compression behavior of granular assembly with non-spherical particles by X-ray micro-computed tomography and discrete element modeling

• 作者: Nan Zhang Ahmadreza Hedayat Shaoyang Han Runlin Yang Héctor Gelber Bola?os Sosa Juan JoséGonzález Cárdenas Guido Edgard Salasálvarez
• 来源期刊: 岩石力学与岩土工程学报（英文版）
• 年，卷（期）: 2021,（5）
• 页码范围: 972-984
• 页数: 13页
• 语种: 英文

摘要

The particle morphological properties, such as sphericity, concavity and convexity, of a granular assembly significantly affect its macroscopic and microscopic compressive behaviors under isotropic loading condition. However, limited studies on investigating the microscopic behavior of the granular assembly with real particle shapes under isotropic compression were reported. In this study, X-ray computed tomography (μCT) and discrete element modeling (DEM) were utilized to investigate isotropic compression behavior of the granular assembly with regard to the particle morphological properties, such as particle sphericity, concavity and interparticle frictions. The μCT was first used to extract the particle morphological parameters and then the DEM was utilized to numerically investigate the in-fluences of the particle morphological properties on the isotropic compression behavior. The image reconstruction from μCT images indicated that the presented particle quantification algorithm was robust, and the presented microscopic analysis via the DEM simulation demonstrated that the particle surface concavity significantly affected the isotropic compression behavior. The observations of the particle connectivity and local void ratio distribution also provided insights into the granular assembly under isotropic compression. Results found that the particle concavity and interparticle friction influ-enced the most of the isotropic compression behavior of the granular assemblies.