Bearing Behavior and Post-Grouting Mechanisms of Large-Diameter Bored Piles in Clay–Silt Interbedded Strata

DOI

10.2991/978-94-6239-682-1_20How to use a DOI?

Keywords

large-diameter cast-in-place piles; post-grouting; clay–silt interbedded strata; pile-end resistance; shaft resistance; load transfer mechanism

Abstract

The clay–silt interbedded stratum exhibits complex structural features and significant variations in soil permeability. Accumulated sediment at the pile tip and disturbance along the pile–soil interface are common problems, which often restrict the mobilization of end resistance, lead to uneven distribution of shaft resistance, and cause the load-bearing performance of cast-in-place piles to deviate from design expectations. To evaluate the practical reinforcement effect of post-grouting in this type of strata, this study relies on the pile foundation project of the main tower of the Jinwei Railway Dongying Yellow River Bridge. Two self-balanced static load tests were performed on the same test pile before and after post-grouting, and the influence of grouting on pile-end resistance, shaft resistance, and load-transfer characteristics was systematically analyzed.

Test results show that pile-end resistance increases significantly after grouting, rising from 12,252 kN before grouting to 26,194 kN after grouting, an increase of more than 100%. Shaft resistance also increases at all depth segments, with the shallow layers showing the most prominent improvement, while the middle and deep layers exhibit relatively stable enhancement. Grouting improves the overall stiffness of the load–displacement curve, and the ultimate bearing capacity increases from 82,442 kN before grouting to 115,545 kN after grouting. The load-transfer mode also changes markedly, shifting from a “shallow-layer-dominated” pattern before grouting to a “multi-layer collaborative” pattern afterward. These findings indicate that post-grouting can effectively improve the pile–soil interface conditions in interbedded strata and enhance the bearing efficiency of large-diameter cast-in-place piles, providing a reference for the design and construction of pile foundations in similarly complex geological conditions.

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  - Manyi Liu
AU  - Jiaxin Lu
AU  - Jianjun Zhang
AU  - Chuang Sun
AU  - Weixiang Zhou
AU  - Min Liu
PY  - 2026
DA  - 2026/06/30
TI  - Bearing Behavior and Post-Grouting Mechanisms of Large-Diameter Bored Piles in Clay–Silt Interbedded Strata
BT  - Proceedings of the 2025 7th International Conference on Civil Architecture and Urban Engineering (ICCAUE 2025)
PB  - Atlantis Press
SP  - 196
EP  - 205
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6239-682-1_20
DO  - 10.2991/978-94-6239-682-1_20
ID  - Liu2026
ER  -