Geomechanics and Engineering

  • 제19권6호
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  • Pages.485-498
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  • 2019
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Investigating the supporting effect of rock bolts in varying anchoring methods in a tunnel

  • Wang, Hongtao (School of Civil Engineering, Shandong Jianzhu University) ;
  • Li, Shucai (Research Center of Geotechnical and Structural Engineering, Shandong University) ;
  • Wang, Qi (Research Center of Geotechnical and Structural Engineering, Shandong University) ;
  • Wang, Dechao (Jinan Rail Transit Group Co., Ltd.) ;
  • Li, Weiteng (Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention, Shandong University of Science and Technology) ;
  • Liu, Ping (School of Civil Engineering, Shandong Jianzhu University) ;
  • Li, Xiaojing (School of Civil Engineering, Shandong Jianzhu University) ;
  • Chen, Yunjuan (School of Civil Engineering, Shandong Jianzhu University)
  • 투고 : 2018.03.19
  • 심사 : 2019.11.17
  • 발행 : 2019.12.30
⟨ 이전 논문 다음 논문 ⟩

초록

Pre-tensioned rock bolts can be classified into fully anchored, lengthening anchored and point anchored bolts based on the bond length of the resin or cement mortar inside the borehole. Bolts in varying anchoring methods may significantly affect the supporting effect of surrounding rock around a tunnel. However, thus far, the theoretical basis of selecting a proper anchoring method has not been thoroughly investigated. Based on this problem, 16 schemes were designed while incorporating the effects of anchoring length, pretension, bolt length, and spacing, and a systematic numerical experiment was performed in this paper. The distribution characteristics of the stress field in the surrounding rock, which corresponded to various anchoring scenarios, were obtained. Furthermore, an analytical approach for computing the active and passive strengthening index of the anchored surrounding rock is presented. A new fully anchoring method with pretension and matching technology are also provided. Then, an isolated loading model of the anchored surrounding rock was constructed. The physical simulation test for the bearing capacity of the model was performed with three schemes. Finally, the strengthening mechanism of varying anchoring methods was validated. The research findings in this paper may provide theoretical guidelines for the design and construction of bolting support in tunnels.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China, Shandong Co-Innovation Center for Disaster Prevention and Mitigation of Civil Structures , Shandong Jianzhu University

The authors express sincere appreciation to the reviewers for their valuable comments and suggestions that helped to improve the quality of the paper. The authors also would like to acknowledge the financial support from the National Natural Science Foundation of China (Nos. 51704177, 51809159, 51604166, 51609130), a Project of Shandong Province Higher Educational Science and Technology Program (J16LG04), Shandong Co-Innovation Center for Disaster Prevention and Mitigation of Civil Structures (XTP201911), and the Doctoral Research Fund of Shandong Jianzhu University (XNBS1501).

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  4. An upper bound design method for roof bolting support in roadways with top coal vol.14, pp.9, 2019, https://doi.org/10.1007/s12517-021-06660-z