Study on Instability Mechanisms of Straight-Arm Rock Anchor Abutments Based on Bearing Rock Bolt Monitoring

DOI

10.2991/978-94-6239-682-1_6How to use a DOI?

Keywords

straight-arm rock bolt structure; failure mechanism; bearing limit; intelligent monitoring rock bolt

Abstract

As a new type of underground powerhouse lifting system support structure, the straight-arm rock anchor abutments has the characteristics of lightweight structure and flexible layout. Aiming at the problem of detachment and instability between concrete abutments and rock walls, the failure mechanism of key components such as contact surface, bearing rock bolt and auxiliary rock bolt was studied, and the design idea of straight-arm rock anchor abutments was established with the bearing limit of inclined rock bolt as the key evaluation index. The research results indicate that the introduction of a horizontal auxiliary rock bolt group provides a design basis for the selection of the neutral point O on the contact surface. Compared to the structure without load-bearing rock bolt, the ultimate bearing capacity of the straight-arm rock bolt with 1-2 inclined rock bolts increased by 6% and 56.3% respectively. Under the action of upper loads, the instability of straight-arm rock bolts and abutments exhibits a progressive evolution law of contact surface strength failure, yield of load-bearing rock bolt, and instability of elastic rock foundations. The engineering monitoring datas show that when the upper design crane load is applied, the maximum axial force monitored by the integrated load-bearing rock bolt is 5.54KN, which is far below the allowable values of standard design and material performance, and the key load-bearing components of structure are in a safe and reliable service state.

Copyright

© 2026 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Feng Wang
AU  - Xiaomu Liao
AU  - Xingtao Ren
AU  - Ke Lu
AU  - Hao Fang
AU  - Fengwei Wu
AU  - Xinxing Chen
PY  - 2026
DA  - 2026/06/30
TI  - Study on Instability Mechanisms of Straight-Arm Rock Anchor Abutments Based on Bearing Rock Bolt Monitoring
BT  - Proceedings of the 2025 7th International Conference on Civil Architecture and Urban Engineering (ICCAUE 2025)
PB  - Atlantis Press
SP  - 45
EP  - 60
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6239-682-1_6
DO  - 10.2991/978-94-6239-682-1_6
ID  - Wang2026
ER  -