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Mechanical behavior around double circular openings in a jointed rock mass under uniaxial compression

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Abstract

To better understand the mechanical behavior in a jointed rock mass, a series of uniaxial compression tests were conducted on non-persistently jointed rock specimens with double circular holes. Acoustic emission (AE) and digital image correlation (DIC) techniques were applied to capture micro-crack events and real-time strain field evolution in the specimens. The results indicate that the existence of non-persistent joints has a significant influence on the strength characteristics of the specimens. Specifically, peak strength decreases at first and reaches a minimum at 30° then increases with increase in the joint dip angle. DIC technology has successfully monitored the development of surface strain fields. The fracture evolution process is comprehensively understood. Every sudden change in a strain field is usually accompanied by apparent AE events and stress–strain curves take the form of oscillations. The crack coalescence modes among joints can be summarized as six types and the crack coalescence patterns around holes and joints can be divided into three categories. These results are helpful to understanding further the mechanical properties and fracture mechanism of openings in non-persistently jointed rock masses.

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Acknowledgement

This research was supported by the National Natural Science Foundation of China (Grant Nos. 11772358, 51174228). Meanwhile, authors are very grateful for the anonymous reviewers’ valuable comments.

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Authors and Affiliations

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

    Qibin Lin, Ping Cao, Rihong Cao, Hang Lin & Jingjing Meng

  2. Department of Civil, Environmental and Natural Resources Engineering, Lulea University of Technology, 97187, Luleå, Sweden

    Jingjing Meng

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Correspondence to Qibin Lin.

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Lin, Q., Cao, P., Cao, R. et al. Mechanical behavior around double circular openings in a jointed rock mass under uniaxial compression. Archiv.Civ.Mech.Eng 20, 19 (2020). https://doi.org/10.1007/s43452-020-00027-z

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