Research on the deformation and failure evolution of sandstone under triaxial compression based on PFC2D

3rd International Conference on Energy Materials and Environment Engineering

能源学;生态环境科学

Yang, X.B.^1 ; Han, X.X.^1 ; Zhou, T.B.^1 ; Liu, E.L.^1

School of Resource and Safety Engineering, China University of Mining and Technology (Beijing), Beijing

100083, China^1

关键词: Comparative analysis;    Deformation and failures;    Deformation localization;    Dislocation velocities;    Evolution characteristics;    Surface deformation;    Triaxial compression;    Typical simulation curves;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/61/1/012090/pdf
DOI  :  10.1088/1755-1315/61/1/012090

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Through the comparative analysis of the results of the triaxial compression experiments of sandstone and the numerical simulation results of particle flow code PFC2Dunder the same conditions, the typical simulation curve and the corresponding simulation process were selected to analyze the evolution characteristics of the surface deformation field, the evolution characteristics of the velocity field and displacement field of the deformation localization bands of sandstone under triaxial compression. Research results show that the changes of the velocities and displacements of deformation localization bands corresponds to the change of stress during compression; In the same deformation localization band, the dislocation velocities are always in the same direction, but in the direction vertical to the localization band, the localization band sometimes squeezes and sometimes stretches; At different positions of the same deformation localization band, the dislocation velocities and extrusion velocities are both different at the same time; In the post-peak stage of loading, along the same deformation localization band, the dislocation displacements close to both loaded ends are generally greater than the ones near to the middle position of the specimen, the stretching displacements close to both loaded ends are generally smaller than the ones near to the middle position of the specimen.