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Shock and Vibration
Volume 2017, Article ID 7687802, 12 pages
https://doi.org/10.1155/2017/7687802
Research Article

Dynamic Fracturing Behavior of Layered Rock with Different Inclination Angles in SHPB Tests

School of Resources and Safety Engineering, Central South University, Changsha 410083, China

Correspondence should be addressed to Diyuan Li; nc.ude.usc@il.nauyid

Received 11 June 2017; Accepted 12 October 2017; Published 12 December 2017

Academic Editor: Salvatore Russo

Copyright © 2017 Jiadong Qiu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The fracturing behavior of layered rocks is usually influenced by bedding planes. In this paper, five groups of bedded sandstones with different bedding inclination angles θ are used to carry out impact compression tests by split Hopkinson pressure bar. A high-speed camera is used to capture the fracturing process of specimens. Based on testing results, three failure patterns are identified and classified, including (A) splitting along bedding planes; (B) sliding failure along bedding planes; (C) fracturing across bedding planes. The failure pattern (C) can be further classified into three subcategories: (C1) fracturing oblique to loading direction; (C2) fracturing parallel to loading direction; (C3) mixed fracturing across bedding planes. Meanwhile, a numerical model of layered rock and SHPB system are established by particle flow code (PFC). The numerical results show that the shear stress is the main reason for inducing the damage along bedding plane at = 0°~75°. Both tensile stress and shear stress on bedding planes contribute to the splitting failure along bedding planes when the inclination angle is 90°. Besides, tensile stress is the main reason that leads to the damage in rock matrixes at = 0°~90°.