Numerical Analysis of the Pullout Bearing Characteristics of Artificial Excavated Piles with Post-Grouting after Prefabricated Retaining Walls

DOI

10.2991/978-94-6463-658-1_60How to use a DOI?

Keywords

Precast retaining wall bored pile; Post-grouting; Vertical uplift bearing capacity; Lateral resistance; Numerical simulation

Abstract

Precast retaining wall post-grouting manual excavation pile is a new type of pile foundation. It adopts the method of manual segmented excavation, installation of precast retaining wall to form holes and then pouring concrete and combined with the method of pressure grouting at the bottom of the pile, which overcomes the disadvantages of traditional cast-in-place retaining wall manual excavation pile, such as complicated process, long construction period, difficult to guarantee bearing capacity and high safety risk. However, up to now, the research on the key construction technology, bearing capacity and design theory of this pile type is still insufficient, which hinders the promotion and application of this technology to a certain extent. In order to investigate the pullout bearing characteristics of artificial excavated piles with post-grouting after prefabricated retaining walls, three-dimensional numerical models of two types of pullout piles—one with post-grouting and one without—were developed based on numerical methods. By comparing the calculations, the pullout characteristics of the post-grouted artificial excavated piles were revealed. The results indicate that post-grouting significantly enhances the ultimate pullout bearing capacity of the piles and reduces the uplift displacement; under the pressure of the grout, the infiltrating and compacting effect of the grout can more effectively transfer the load to the surrounding soil layers, significantly increasing the lateral resistance of the post-grouted piles compared to non-grouted piles. The failure mode of the post-grouted artificial excavated piles is characterized by cylindrical shear failure at the pile-soil interface. The research results provide a theoretical basis for the pullout design of artificial excavated piles with post-grouting after prefabricated retaining walls.

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  - Lulu Wang
AU  - Jianbo Wang
AU  - Hanqin Wu
AU  - Jianxin Bao
AU  - Liming Yin
AU  - Xinjun Gao
PY  - 2025
DA  - 2025/03/03
TI  - Numerical Analysis of the Pullout Bearing Characteristics of Artificial Excavated Piles with Post-Grouting after Prefabricated Retaining Walls
BT  - Proceedings of the 2024 10th International Conference on Architectural, Civil and Hydraulic Engineering (ICACHE 2024)
PB  - Atlantis Press
SP  - 589
EP  - 600
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-658-1_60
DO  - 10.2991/978-94-6463-658-1_60
ID  - Wang2025
ER  -