Abstract
With the increasing complexity of engineering geological conditions, the problem of tensile-shear failure of bolts is becoming more serious. Accurate modelling of the performance of bolted rough joints subjected to tensile-shear load is essential for support design. In this paper, based on the theoretical criteria of bolt failure, the mechanical model of the Pile element in the FLAC3D program is modified, and the accuracy of the modified model is verified by numerical and experimental bolted rock joint shear tests. Then, the performance of bolted rough rock joints under shear load is studied. On the basis of the numerical modelling results, the interaction characteristics between bolt and surrounding rock, the distribution and evolution characteristics of bolt force and bolt shear resistance, and joint surface shear stress are revealed. Meanwhile, the influence of normal stress and joint roughness coefficient (JRC) are investigated. The research results are anticipated to give a useful guidance for the design optimization of bolting support for surrounding rock in underground engineering.
Article highlights
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Based on the bolt failure theoretical criterion, a modified mechanical model of the Pile element is developed and embedded into FLAC3D.
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The evolution characteristics of bolt force and its effect on joint surface shear stress are investigated.
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The effect of normal stress and joint roughness coefficient on the performance of bolted rough joint subjected to shear load is investigated.
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Acknowledgements
This study is funded by the National Natural Science Foundation of China (No. 52104093) and the Shandong Provincial Natural Science Foundation (Nos. ZR2019BEE065, ZR2020QE120 and ZR2021QE069). These supports are gratefully acknowledged.
Funding
Funding was provided by the National Natural Science Foundation of China (No. 52104093) and the Shandong Provincial Natural Science Foundation (Nos. ZR2019BEE065, ZR2020QE120 and ZR2021QE069). These supports are gratefully acknowledged.
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Jiang, Y., Zhang, S., Luan, H. et al. Numerical modelling of the performance of bolted rough joint subjected to shear load. Geomech. Geophys. Geo-energ. Geo-resour. 8, 140 (2022). https://doi.org/10.1007/s40948-022-00447-6
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DOI: https://doi.org/10.1007/s40948-022-00447-6