Abstract
Resin end-anchored rockbolts consist of three parts: (1) anchored section; (2) free section; and (3) faceplate and locking nut. Tensile failure of the bolt rod usually occurs in the free section. This paper presents a new model for end-anchored rockbolts loaded in tension by implementing a novel tensile failure criterion as part of a 3D continuum numerical modeling package. The proposed model is applied to the study of the behavior of end-anchored rockbolts in a deep coal roadway. The results are in close agreement with both experimental results and field observations in terms of load–displacement relationships and deformation characteristics. The results indicate that the use of rockbolts with high tensile strength and capable to undergo higher elongation would be a key controlling factor for designing excavations in deep coal mines, and the allowable elongation of the bolts in the ribs should be larger than the ones in the roof for deep coal roadways.
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Abbreviations
- F :
-
Axial force (load)
- U :
-
Axial elongation
- \({F_{{\text{tmax}}}}\) :
-
Ultimate tensile load
- U max :
-
Ultimate elongation
- K :
-
Axial stiffness
- A :
-
Reinforcement cross-sectional area
- E :
-
Young’s modulus
- E T :
-
Tangent modulus
- L :
-
CableSEL length
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Acknowledgements
The authors acknowledge financial support from the Fundamental Research Funds for the Central Universities (2018ZDPY02), the National Natural Science Foundation of China (51604268 and 51574227), PAPD (SZBF2011-6-B35) and the Independent Research Project of State Key Laboratory of Coal Resources and Safe Mining, CUMT (SKLCRSM18X08).
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Appendix
Appendix
We used a set of FISH functions in the FLAC3D model to calculate the plastic zone volume. The codes are as follows.
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Yan, S., Song, Y., Bai, J. et al. A Study on the Failure of Resin End-Anchored Rockbolts Subjected to Tensile Load. Rock Mech Rock Eng 52, 1917–1930 (2019). https://doi.org/10.1007/s00603-018-1663-2
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DOI: https://doi.org/10.1007/s00603-018-1663-2