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Development of a New Rockbolt with High Load and Large Deformation Capacities

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Abstract

A new rockbolt for rock support in deep underground engineering is developed. The bolt, which is called 2S-bolt, is composed of a threadbar, a sliding piston, a sliding-resistance cone pipe, an anchorage section, a plate, and a plate-nut. The deformation of the bolt is composed of frictional sliding of the sliding piston in the sliding-resistance cone pipe in the first deformation stage and steel stretching of the threadbar in the second deformation stage. The structure and working principle of the new bolt is introduced first, followed by a laboratory study of the sliding resistances of each component of the bolt. Next, laboratory static pull-out tests of 2S-bolts with different sliding piston lengths are conducted and the results analyzed. The test results show that the bolt with a 30 cm long sliding piston can increase the load from 120 kN in the first deformation stage to 210 kN in the second deformation stage and it has a deformation capacity and an energy absorption capacity of 500 mm and 83.5 kJ, respectively. The average anchor force of the bolt with a 45 cm long sliding piston is 181.7 kN with an energy absorption capacity of 77.8 kJ. When utilized for rock support in rockbursting and squeezing grounds, the newly developed 2S-bolt can absorb a large amount of energy at a higher load capacity.

Highlights

  • A new rockbolt called 2S-bolt is developed for rock support in deep underground engineering.

  • The deformation of the 2S-bolt is composed of two stages: frictional sliding and steel stretching.

  • The 2S-bolt uses a sliding piston and a conical tube to maintain high load resistance during sliding.

  • Laboratory tests show that the 2S-bolt can increase load capacity, have large deformation and energy absorption capacities, and is suitable for use in squeezing and rockbursting grounds.

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Data availability

All data used during this study are available from the corresponding author by request.

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Acknowledgements

This study was funded by the National Science Foundation of China (51874068, 52074062, 51974061, 42177169).

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Authors and Affiliations

  1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang, 110819, People’s Republic of China

    Zhengming Yang, Shuai Xu, Hao Zhang, Wenzhi Guo & Ming Cai

  2. School of Engineering and Computer Science, Laurentian University, Sudbury, ON, Canada

    Ming Cai

  3. MIRARCO, Laurentian University, Sudbury, ON, Canada

    Ming Cai

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  1. Zhengming Yang
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  2. Shuai Xu
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  3. Hao Zhang
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  4. Wenzhi Guo
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  5. Ming Cai
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Correspondence to Ming Cai.

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Yang, Z., Xu, S., Zhang, H. et al. Development of a New Rockbolt with High Load and Large Deformation Capacities. Rock Mech Rock Eng 56, 6603–6614 (2023). https://doi.org/10.1007/s00603-023-03416-x

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  • DOI: https://doi.org/10.1007/s00603-023-03416-x

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