Abstract
This study provides a method to carry out dynamic shear experiments of a discontinuity under impact loading condition. It employs a biaxial Hopkinson pressure bar (BHPB) equipment as a loading device. The impact shear loading, initial normal stress and initial shear stress can be applied on discontinuity using BHPB equipment. The dynamic shear stress of discontinuity is calculated from the transmitted wave in the tangential direction. The dynamic normal stress is calculated from the transmitted wave in the normal direction. The dynamic shear displacement and normal displacement are measured using a high-speed two-dimensional digital image correlation (2D-DIC) technique. The impact shear experiments of metallic specimens with artificial sawtooth discontinuity are conducted. Results show that within the elastic deformation range, the dilation angle keeps constant; and the shear strength is independent of initial shear stress. It proves that the loading device and data processing are reliable. Furthermore, during the shear slip process, the normal boundary of discontinuity has approximately constant stiffness. Finally, the dynamic shear stress vs. shear displacement curve of the discontinuity is obtained. This study lays an experimental basis for further research on the impact shear properties of rock structural planes. It also provides a reference for investigating the elastic shear deformation behaviours of rock joints.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
