Mechanism and Numerical Analysis of Micropile-Pressure-Type Anchor Composite Foundations Under Uplift Load

DOI

10.2991/978-94-6463-688-8_12How to use a DOI?

Keywords

Composite foundation; Pressure-Type Anchor; Micropile; Uplift bearing capacity; Numerical analysis

Abstract

This study introduces a novel composite foundation designed to address the safety and convenience issues associated with the construction of traditional transmission tower foundations. The foundation incorporates micro piles and pressure-type anchor rods, connected to the upper tower via steel abutments. By using the finite element software ABAQUS to establish a model, this study delved into the load sharing effect mechanism of composite foundations under uplift loads and conducted case verification. The research results indicate that micro piles bear the main tensile force in the initial stage, while pressure type anchor rods gradually share more tensile force with increasing load. Furthermore, based on field test conditions, this study analyzed the effects of factors such as the depth of micro pile embedding in rock, soil elastic modulus, rock elastic modulus, and soil cohesion on the bearing capacity of various parts of composite foundations. The results indicate that the micro-pile pressure anchor composite foundation demonstrates an effective collaborative mechanism under uplift loads, with micro piles initially bearing the primary tensile force and pressure-type anchor rods increasingly sharing the load as the load increases, thereby enhancing the foundation’s pull-out capacity. The tensile bearing capacity of the foundation is significantly influenced by the elastic modulus and cohesion of the surrounding rock and soil, with increases in soil elastic modulus enhancing the workability of the composite foundation and reducing uplift displacement. Furthermore, the load-sharing ratio of pressure-type anchor rods stabilizes initially and then decreases with increasing soil material parameters, while an increase in rock material parameters leads to a rising load-sharing ratio for the anchor rods, which slows down as the bearing capacity of the rock-embedded micro piles grows.

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  - Bing Feng
AU  - Qi Zhang
AU  - Panfeng Li
AU  - Ji’an Zhou
AU  - Qing Lü
PY  - 2025
DA  - 2025/04/30
TI  - Mechanism and Numerical Analysis of Micropile-Pressure-Type Anchor Composite Foundations Under Uplift Load
BT  - Proceedings of the 2024 6th International Conference on Civil Architecture and Urban Engineering (ICCAUE 2024)
PB  - Atlantis Press
SP  - 103
EP  - 113
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-688-8_12
DO  - 10.2991/978-94-6463-688-8_12
ID  - Feng2025
ER  -