Abstract
The computerized tomography (CT) images and CT values for the process of unloading, micro-cracking, and dilation up to the failure of limestone specimens under different unloading levels have been obtained by using the real-time CT technique. Clear CT images and CT value of the stages from compression of micro-cavities → emergence of micro-cracks → bifurcation → development → coalescence → suddenly collapse → rapid stress drop → unloading can be observed. The CT value, equivalent to rock density in the CT scan layer, is the most important parameter describing the damage evolution process of rock. The paper reveals that the mechanical behaviors of rock under unloading are different from those under loading due to its load-path dependency. It is clear from the experiment that it is easy for failure phenomenon of rock to happen suddenly under unloading. The mechanism of damage evolution of limestone is analyzed. Moreover, a damage model based on CT value and a new failure criterion are established.
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.
