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Shear Behaviour and Acoustic Emission Characteristics of Bolted Rock Joints with Different Roughnesses

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Abstract

To study shear failure, acoustic emission counts and characteristics of bolted jointed rock-like specimens are evaluated under compressive shear loading. Model joint surfaces with different roughnesses are made of rock-like material (i.e. cement). The jointed rock masses are anchored with bolts with different elongation rates. The characteristics of the shear mechanical properties, the failure mechanism, and the acoustic emission parameters of the anchored joints are studied under different surface roughnesses and anchorage conditions. The shear strength and residual strength increase with the roughness of the anchored joint surface. With an increase in bolt elongation, the shear strength of the anchored joint surface gradually decreases. When the anchored structural plane is sheared, the ideal cumulative impact curve can be divided into four stages: initial emission, critical instability, cumulative energy, and failure. With an increase in the roughness of the anchored joint surface, the peak energy rate and the cumulative number of events will also increase during macro-scale shear failure. With an increase in the bolt elongation, the energy rate and the event number increase during the shearing process. Furthermore, the peak energy rate, peak number of events and cumulative energy will all increase with the bolt elongation. The results of this study can provide guidance for the use of the acoustic emission technique in monitoring and predicting the static shear failure of anchored rock masses.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (Nos. 51479108, 51379117, and 41672281), the Taishan Scholar Talent Team Support Plan for Advantaged & Unique Discipline Areas, and the Fundamental Research Funds of Shandong University (2017JC001).

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Correspondence to Gang Wang.

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Wang, G., Zhang, Y., Jiang, Y. et al. Shear Behaviour and Acoustic Emission Characteristics of Bolted Rock Joints with Different Roughnesses. Rock Mech Rock Eng 51, 1885–1906 (2018). https://doi.org/10.1007/s00603-018-1438-9

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  • DOI: https://doi.org/10.1007/s00603-018-1438-9

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