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Test Study on Multi Tray Bolt in Gob-Side Entry Retaining Formed by Roof Cut and Pressure Releasing

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Abstract

In order to obtain satisfactory effect of control of roadway-side, there is a kind of multi tray bolt developed by numerical simulation and field test in gob-side entry retaining formed by roof cut and pressure releasing. After the installation, multi tray bolt experience two working process: the bolt bolting stage and the bolt automatic pre tightening stage. Bolt rod body stress more uniform with the increase of the number of small trays and bolt forms the pre tightening force between the small tray and the large tray with the goaf roof caving by numerical simulation. Through the resistance drawing power field test of multi tray bolt, the resistance drawing power of 2113 multi tray bolt is 8.2t and 2113 multi tray bolt is 9.8t, So it is determined that 2113 type multi tray bolt is used for the field application. The roof-floor displacement is 0 mm and the two side maximum displacement is 12 mm according to the field application effect. The 2113 multi tray bolt can meet the requirement of controlling the roadway along the empty tunnel and can achieve satisfactory results.

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Acknowledgements

The authors wish to acknowledge the funding support from Fund Project: Project supported by the National Key Research Development Program (Grant No. 2016YFC0600900) and the National Natural Science Foundation of China (Grant No. 41602308).

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Authors and Affiliations

  1. State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing, 100083, China

    Pengfei Guo, Manchao He & Jiong Wang

  2. Institute of Mechanics and Architectural Engineering, China University of Mining and Technology, Beijing, 100083, China

    Pengfei Guo, Manchao He & Jiong Wang

  3. Hecaogou NO.2 Coal Mine, Yanan Checun Coal Group Corporation Limited, Yanan, 717300, China

    Haitao Zhou

Authors
  1. Pengfei Guo
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  2. Manchao He
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  3. Jiong Wang
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Correspondence to Pengfei Guo.

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Guo, P., He, M., Wang, J. et al. Test Study on Multi Tray Bolt in Gob-Side Entry Retaining Formed by Roof Cut and Pressure Releasing. Geotech Geol Eng 35, 2497–2506 (2017). https://doi.org/10.1007/s10706-017-0253-5

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  • DOI: https://doi.org/10.1007/s10706-017-0253-5

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