标题：Grain-scale reconstruction and simulation of coal mechanical deformation and failure behaviors using combined SEM Digital Rock data and DEM simulator
作者：Xu, Hao; Wang, Gang; Fan, Cheng; Liu, Xuelin; Wu, Mengmeng
作者机构：[Xu, Hao] China Univ Min & Technol, Sch Emergency Management & Safety Engn, Beijing 100083, Peoples R China.; [Wang, Gang; Fan, Cheng; Liu, Xuelin] 更多
通讯作者：Wang, Gang;Wang, G
通讯作者地址：[Wang, G]Shandong Univ Sci & Technol, Coll Min & Safety Engn, Room 108,579 Qianwangang Rd, Qingdao 266510, Peoples R China.
关键词：Grain-scale Digital Rock; SEM; DEM; Digital Rock Failure simulation
摘要：The microstructure of coal determines its mechanical behaviors under various loading conditions. In this study, DEM models were proposed based on the grain-scale reconstructed coal structure. The obtained SEM images were digitalized and converted to the binary digital images, and then introduced to build DEM numerical models reflecting the different microstructure characteristics of the coal. Finally, numerical simulation of biaxial compression were performed on each coal sample model. The results showed that different coal samples have different damage patterns under biaxial compression depending on their unique microstructural features. The initiation and propagation of tensile cracks are the main factors for the deformation and failure of coal samples. Near the peak strength of the axial stress, the average contact force between particles is the largest and the crack propagation speed is the fastest. In addition, high confining pressure and loading rate will promote the deformation and failure of coal samples. (C) 2019 Elsevier B.V. All rights reserved.