Experimental Study on Spacing Calculation and Ultimate Pull-Out Bearing Capacity of Multi-Expansion Anchor Rod

DOI

10.2991/978-94-6463-793-9_75How to use a DOI?

Keywords

expanded plate anchor rod; expansion disk spacing; ultimate bearing capacity; pull-out test; loess

Abstract

The multi-expansion anchor rod is a new type of anchor rod, which is designed to solve the problems of insufficient anchorage force and limited anchor rod length in traditional anchor rods used in slope support applications. The multi-expansion anchor rod expands the contact area with the rock and soil mass by installing multiple expansion plates in the anchorage section, enhancing the bearing capacity and anchoring force of the anchor rod, and thus improving the overall support effect. This makes the anchor rod to adapt to more complex slope support requirements, especially in high steep slopes or soft rock strata, where its application has significant advantages. In this paper, the specific calculation formula of the independent working spacing of the expansion disk at different burial depths is derived by simplifying the mechanical model, and the pull-out test pieces were made by similar principle and the pull-out test was carried out to obtain the corresponding load-displacement curve. The error between the predicted value of the formula and the experimental result is small, which verifies the validity of the formula. When the grouting expansion bolt is in the loess, the anchoring section between the expansion plates mainly serves to connect the expansion plates, and provides a limited role for the overall ultimate bearing capacity of the bolt, and it can be saved some materials; according to the buried depth, the spacing of support disks is adjusted, and the anchoring force of the expanded disk anchor rod in the soft soil layer is about four times that of the ordinary conventional anchor rod with the same length, which effectively improves the anchoring capacity of the expanded disk anchor rod. The formulas proposed in this paper provide a theoretical basis for the application of expanded anchor bolts in practicall engineering design, and provide a feasible reference for further optimizing the support design and improving the slope stability.

Copyright

© 2025 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  - Yanpeng Zhu
AU  - Ruixin Li
PY  - 2025
DA  - 2025/07/28
TI  - Experimental Study on Spacing Calculation and Ultimate Pull-Out Bearing Capacity of Multi-Expansion Anchor Rod
BT  - Proceedings of the 2025 8th International Conference on Traffic Transportation and Civil Architecture (ICTTCA 2025)
PB  - Atlantis Press
SP  - 893
EP  - 908
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-793-9_75
DO  - 10.2991/978-94-6463-793-9_75
ID  - Zhu2025
ER  -