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Failure mechanism of bolting support and high-strength bolt-grouting technology for deep and soft surrounding rock with high stress

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Abstract

In deep underground mining, the surrounding rocks are very soft with high stress. Their deformation and destruction are serious, and frequent failures occur on the bolt support. The failure mechanism of bolt support is proposed to solve these problems. A calculation theory is established on the bond strength of the interface between the anchoring agent and surrounding rocks. An analysis is made on the influence law of different mechanical parameters of surrounding rocks on the interfacial bond strength. Based on the research, a new high-strength bolt-grouting technology is developed and applied on site. Besides, some helpful engineering suggestions and measures are proposed. The research shows that the serious deformation and failure, and the lower bond strength are the major factors causing frequent failures of bolt support. So, the bolt could not give full play to its supporting potential. It is also shown that as the integrity, strength, interface dilatancy and stress of surrounding rocks are improved, the bond strength will increase. So, the anchoring force on surrounding rocks can be effectively improved by employing an anchoring agent with high sand content, mechanical anchoring means, or grouting reinforcement. The new technology has advantages in a high strength, imposing pre-tightening force, and giving full play to the bolt supporting potential. Hence, it can improve the control effect on surrounding rocks. All these could be helpful references for the design of bolt support in deep underground mines.

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Authors and Affiliations

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

    Shu-cai Li  (李术才), Hong-tao Wang  (王洪涛), Qi Wang  (王琦) & Bei Jiang  (江贝)

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

    Hong-tao Wang  (王洪涛)

  3. Post-Doctoral Scientific Research Station, Yankuang Group Company Limited, Zoucheng, 273500, China

    Qi Wang  (王琦), Fu-qi Wang  (王富奇), Nian-bo Guo  (郭念波) & Wen-jiang Liu  (刘文江)

  4. Liangjia Coal Mine, Longkou Coal-Electric Company Limited, Longkou, 265700, China

    Yao-xi Ren  (任尧喜)

Authors
  1. Shu-cai Li  (李术才)
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  2. Hong-tao Wang  (王洪涛)
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  3. Qi Wang  (王琦)
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  4. Bei Jiang  (江贝)
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  5. Fu-qi Wang  (王富奇)
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  6. Nian-bo Guo  (郭念波)
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  7. Wen-jiang Liu  (刘文江)
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  8. Yao-xi Ren  (任尧喜)
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Corresponding author

Correspondence to Qi Wang  (王琦).

Additional information

Foundation item: Projects(51304125, 51379114) supported by the National Natural Science Foundation of China; Project(BS2013NJ004) supported by Award Fund for Outstanding Young and Middle-Aged Scientist of Shangdong Province, China; Project(201301004) supported by the Innovation Fund for Postdoctor of Shandong Province, China

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Li, Sc., Wang, Ht., Wang, Q. et al. Failure mechanism of bolting support and high-strength bolt-grouting technology for deep and soft surrounding rock with high stress. J. Cent. South Univ. 23, 440–448 (2016). https://doi.org/10.1007/s11771-016-3089-x

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  • DOI: https://doi.org/10.1007/s11771-016-3089-x

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