Investigation on Strain Localization of Coal Using Micro-finite Difference Modelling
The behavior of saturated coal under compressive loads is very important for evaluating the coal mass stability and mining hazards control.This paper presents a numerical study of localized deformation process in saturated coal sample.Our approach combines X-ray micro-computed tomography (microCT)imaging with micro-finite difference analysis (microFDA).The three-dimensional images of a coal sample before compression were acquired by microCT scanner.Then the images were used to create finite difference model.The material properties of different groups in saturated coal were assumed based on previous experiments results.Finally,the FLAC3D code was employed calculate the strain localization features.The model was used to examine the materials structural response to compressive loading by studying the stress distributions and material deformation.Results indicate that the nature of internal material distribution in coal sample affect failure features greatly.It also shows that a diffuse,wide shear strain localization band progressively thinning during the failure process.
Saturated coal,Compression test Strain localization,X-ray microcomputed tomography,Micromechanical modeling Finite difference modeling
Yixin Zhao Jingli Han Yaodong Jiang Zhongsheng Tian You Yu
State Key Lab of Coal Resources and Safe Mining,China University of Mining and Technology,D11 Xueyua School of Mechanics and Civil Engineering,China University of Mining and Technology,D11 Xueyuan Road State Key Lab of Coal Resources and Safe Mining,China University of Mining and Technology,D11 Xueyua
国际会议
北京
英文
507-517
2012-10-15（万方平台首次上网日期，不代表论文的发表时间）