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Experimental study of axial stress distribution and transfer along the bolt rods in an underground coal mine

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Abstract

Based on the data of experimental tests, underground pullout tests, and real-time monitoring of active anchor-bolt stress in the Dingji Coal Mine in the Huainan mining area, China, the axial stress distribution along the bolt rods in a coal mine roadway was obtained. The results show that the axial stress in bolts increases initially then decreases along the anchoring direction under a perfect anchoring state. As the pre-tension is increased, the stress variation displays nonlinear behavior. The external section of the anchoring bolt rod plays a primary role in restricting the deformation of the surrounding rock before failure occurs. The results also indicate that the bending moment in the bolt rod has a significant effect on the axial stress distribution and transfer, and the bearing and supporting effects of the bolt increase as the pre-tension increases to a certain extent. The axial stress and its transfer features in a working bolt along the embedded direction are nonuniformly distributed and fluctuate.

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Acknowledgments

This study was supported by the National Natural Science Foundation of China (Grant No. 51404256), the National Basic Research Program of China (Grant No. 2013CB227900), and the Fundamental Research Funds for the Central Universities (Grant No. 2014QNA51). The authors would like to express their appreciation to the staff at the China University of Mining and Technology and the Dingji Coal Mine for their valuable assistance.

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Authors and Affiliations

  1. Key Laboratory of Deep Coal Resource Mining of the Ministry of Education, School of Mines, China University of Mining and Technology, Xuzhou, 221116, China

    Yiming Zhao, Nong Zhang & Xigui Zheng

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  1. Yiming Zhao
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  2. Nong Zhang
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  3. Xigui Zheng
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Correspondence to Yiming Zhao.

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Zhao, Y., Zhang, N. & Zheng, X. Experimental study of axial stress distribution and transfer along the bolt rods in an underground coal mine. Arab J Geosci 9, 30 (2016). https://doi.org/10.1007/s12517-015-2145-4

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  • DOI: https://doi.org/10.1007/s12517-015-2145-4

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