Abstract
Cavities and flaws are common types of defects in rock specimens that have an important impact on the mechanical properties of rockmass. In this paper, cement mortar was used to prefabricate a rock-like specimen with two cavities and a single flaw, and the uniaxial compression test was carried out. The process of fracture evolution on the specimen surface was obtained by using photography technology. The evolution regularity of a fracture was monitored by utilizing acoustic emission (AE) technology during the process of the specimen failure. Moreover, three-dimensional (3D) tomograms of specimens after uniaxial compression were obtained by using computerized tomography (CT) scanning technology, investigating the development characteristics of microcracks and the distribution of the final macrofractures. The particle flow code in two dimensions (PFC2D) program was used to simulate the mechanical behavior of brittle rock combining with microcrack propagation. The calculated stress-strain curve, AE features, and fracture distribution of the specimen obtained from the PFC2D simulation were relatively consistent with the experimental results.
Highlights
As the main medium for an engineering construction such as a tunnel, slope, and foundation, the bearing capacity of rockmass directly affects the stability of the projects
High-speed photography can only capture the fracture characteristics of the specimen surface; an acoustic emission (AE) monitoring sensor is mounted on the rock surface at a shallow depth, and noise interference is serious, so the results of the analysis rely mainly on the experience of the engineers. erefore, most of the experimental techniques lack accurate acquisition of the internal fracture space
An HDR-CX405 HD digital video camera produced by Sony Corporation was used as the observation system, shooting the process of fracture evolution on the specimen surface. e spatial evolution model of microcrack generation and expansion inside the specimen was monitored by utilizing AE technology during the experiment
Summary
As the main medium for an engineering construction such as a tunnel, slope, and foundation, the bearing capacity of rockmass directly affects the stability of the projects. With the substantial increase in computer performance, the PFC program based on particle flow theory has been widely used in various types of rock mechanics and engineering simulations [16,17,18,19,20,21,22,23]. In other discrete element methods, some scholars such as Misra and Singh [27] and Poorsolhjouy and Misra [28] have used the idea of building computational models by irregular particles to simulate the mechanical behavior of rock materials. We intend to use AE technology, photography technology, and CT scanning technology synthetically, combined with particle flow theory and the PFC program, to study the effect of the interaction between cavity and flaw on the rock mechanical properties under uniaxial compression
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