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Geomechanics and Engineering Volume 17, Number 1, January20 2019 , pages 47-56 DOI: https://doi.org/10.12989/gae.2019.17.1.047 |
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The coalescence and strength of rock-like materials containing two aligned X-type flaws under uniaxial compression |
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Bo Zhang, Shucai Li, Xueying Yang, Kaiwen Xia, Jiyang Liu, Shuai Guo and Shugang Wang
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| Abstract | ||
| Crossing (X-type) flaws are commonly encountered in rock mass. However, the crack coalescence and failure mechanisms of rock mass with X-type flaws remain unclear. In this study, we investigate the compressive failure process of rock-like specimens containing two X-type flaws aligned in the loading direction. For comparison purposes, compressive failure behavior of specimens containing two aligned single flaws is also studied. By examining the crack coalescence behavior, two characteristics for the aligned X-type flaws under uniaxial compression are revealed. The flaws tend to coalesce by cracks emanating from flaw tips along a potential path that is parallel to the maximum compressive stress direction. The flaws are more likely to coalesce along the coalescence path linked by flaw tips with greater maximum circumferential stress if there are several potential coalescence paths almost parallel to the maximum compressive stress direction. In addition, we find that some of the specimens containing two aligned X-type flaws exhibit higher strengths than that of the specimens containing two single parallel flaws. The two underlying reasons that may influence the strengths of specimens containing two aligned X-type flaws are the values of flaw tips maximum circumferential stresses and maximum shear stresses, as well as the shear crack propagation tendencies of some secondary flaws. The research reported here provides increased understanding of the fundamental nature of rock/rock-like material failure in uniaxial compression. | ||
| Key Words | ||
| aligned X-type flaws; rock-like material; crack coalescence; strength; uniaxial compression | ||
| Address | ||
| Bo Zhang, Jiyang Liu and Shuai Guo: School of Civil Engineering, Shandong University, Jinan, Shandong 250061, P.R. China Shucai Li and Shugang Wang: Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, Shandong 250061, P.R. China Xueying Yang: Shandong Urban Construction Vocational College, Jinan, Shandong 250014, P.R. China Kaiwen Xia:Impact and Fracture Laboratory, Department of Civil Engineering and Lassonde Institute, University of Toronto, ON M5S 1A4, Canada | ||