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Mechanical Effect Analysis and Comparative Site Tests on Surrounding Rock with Different Bolt Anchoring Lengths and Pre-tightening Forces

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Abstract

Different bolt anchoring lengths and pre-tightening forces produce different mechanical and control effects on the surrounding rock. For clarification of the effects, a numerical comparative test is conducted to analyze the stress field distribution features of surrounding rock with different bolt anchoring lengths and pre-tightening forces. A high pre-tightening force quantitative exerting device is developed for high strength bolts with a function of automatic anchor retreat. With the device, a test on site is conducted at a typical roadway of Zhaolou Coal Mine in China; this test is on the comparative plans designed with different bolt anchoring lengths and pre-tightening forces; and the controlling effect is obtained on the surrounding rock in each supporting plan through the analysis of the test. This study shows it is conducive for the bolt pre-tightening force diffusing in surrounding rocks to exert high pre-tightening force and arrange a certain length of non-anchoring section; and it is conducive to form an effective bearing structure of anchored rocks. The new device is self-developed with independent intellectual property rights; and it can meet the requirement of roadway bolt support under high stress with many advantages such as large scale quantitative of pre-tightening force exerting and being easy to operate. Increasing pre-tightening force is an effective way to improve the control effect of surrounding rock; and an appropriate reduction of the bolt anchoring length will not significantly weaken the effect of the surrounding rock control, under certain conditions. The above conclusion can provide reference and experience for the anchoring support design and construction of the underground engineering.

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Acknowledgements

Much of the work presented in this paper was supported by the Natural Science Foundation of China (Nos. 51674154 and 51474095), the China Postdoctoral Science Foundation (2016M590150), and Open Fund for State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing (SKLGDUEK1519). The authors would like to express appreciation to the reviewers for their valuable comments and suggestions that helped to improve the quality of the paper.

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Authors and Affiliations

  1. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, 250061, China

    Qi Wang, Hongtao Wang, Rui Pan, Shucai Li, Bei Jiang, Qian Qin, Chong Zhang & Yingdong Xu

  2. Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Qi Wang & Manchao He

  3. School of Civil Engineering, Shandong Jianzhu University, Jinan, 250101, China

    Hongtao Wang

  4. School of Civil Engineering and Architecture, University of Jinan, Jinan, 250022, China

    Bei Jiang

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  1. Qi Wang
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  2. Hongtao Wang
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  3. Rui Pan
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  4. Shucai Li
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  5. Manchao He
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  6. Bei Jiang
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  7. Qian Qin
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  8. Chong Zhang
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  9. Yingdong Xu
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Correspondence to Qi Wang.

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Wang, Q., Wang, H., Pan, R. et al. Mechanical Effect Analysis and Comparative Site Tests on Surrounding Rock with Different Bolt Anchoring Lengths and Pre-tightening Forces. Geotech Geol Eng 37, 1195–1209 (2019). https://doi.org/10.1007/s10706-018-0678-5

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  • DOI: https://doi.org/10.1007/s10706-018-0678-5

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