Document Type

Conference Paper

Publication Date


Publication Details

Mehdi Serati, Hamid Roshan, Ali Mirzaghorbanali, Mutaz El-Amin Mahmoud, Thejaswee Valluru, Fracture propagation mode of coal under indirect tensile stresses, Proceedings of the 2021 Resource Operators Conference, University of Wollongong - Mining Engineering, 10-12 February 2021, University of Southern Queensland, 311-316.


ABSTRACT: This work presents the results of an investigation on the study of fracture pattern in coal under induced tensile stresses using image processing techniques. Several high-speed recordings captured at 5 kHz and above were examined, and three distinct fracture propagation modes were identified. As the coal tensile strength increases, the fracture behaviour was observed to be a spalling-like rupture in the form of a dominant tensile crack accompanied with multiple large secondary shear fractures that break the test specimen apart into several pieces. Combined localised tensile and shear cracks at intact rock bridges within a coal Brazilian sample (with pre-existing defects) was also observed, indicating a very different failure pattern from that in standard recommendations.