The Application Research of Post-Grouting Technology at the Pile Base in Collapsible Loess Areas

Chuanzhong Feng, Xue Liu, Shaowei Jiang

2024

Abstract

During the construction of bored cast-in-place piles, issues such as grout loss, grout overflow at the pile top, and the uplift of the reinforcement cage frequently occur, resulting in the pile's bearing capacity failing to meet the design requirements even after post-grouting. This study investigates the application of post-grouting technology for cast-in-place piles in collapsible loess formations and addresses its key technical challenges. It focuses on controlling the grout fluidity at the pile base, preventing the uplift of the reinforcement cage by installing a steel plate capsule at the pile base, and managing the bearing capacity of the pile after reducing its length. The composite post-grouting technology was successfully implemented in the realignment project of National Highway 108 (Xiangfen-Quwo-Houma section). This technology, utilizing three stages—open grouting, closed grouting, and re-opened grouting—effectively enhanced the bearing capacity of the pile foundation while controlling grout loss and reinforcement cage uplift. Experimental results indicate that the vertical compressive ultimate bearing capacity of single piles fully meets design specifications, significantly improving both the load-bearing performance and construction safety of the pile foundation. This technology not only reduces pile construction costs but also enhances engineering quality and economic efficiency, making it highly valuable and promising for broader engineering applications.

Paper Citation

in Harvard Style

Feng C., Liu X. and Jiang S. (2024). The Application Research of Post-Grouting Technology at the Pile Base in Collapsible Loess Areas. In Proceedings of the 7th International Conference on Environmental Science and Civil Engineering - Volume 1: ICESCE; ISBN 978-989-758-764-1, SciTePress, pages 136-144. DOI: 10.5220/0013580900004671

in Bibtex Style

@conference{icesce24,
author={Chuanzhong Feng and Xue Liu and Shaowei Jiang},
title={The Application Research of Post-Grouting Technology at the Pile Base in Collapsible Loess Areas},
booktitle={Proceedings of the 7th International Conference on Environmental Science and Civil Engineering - Volume 1: ICESCE},
year={2024},
pages={136-144},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0013580900004671},
isbn={978-989-758-764-1},
}

in EndNote Style

TY - CONF

JO - Proceedings of the 7th International Conference on Environmental Science and Civil Engineering - Volume 1: ICESCE
TI - The Application Research of Post-Grouting Technology at the Pile Base in Collapsible Loess Areas
SN - 978-989-758-764-1
AU - Feng C.
AU - Liu X.
AU - Jiang S.
PY - 2024
SP - 136
EP - 144
DO - 10.5220/0013580900004671
PB - SciTePress