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<p>This study investigates the influence of different post-grouting methods on the vertical bearing performance of bored piles through field tests conducted on three types of piles: un-grouting, tip-grouting, and combined-grouting piles. The bi-directional O-cell test method was employed in a high-speed railway project in Jinan, China, with a focus on analyzing the load-settlement curves at the pile top and the distribution of side and tip resistances. Results show that post-grouting significantly enhances ultimate bearing capacity, with tip-grouting and combined-grouting piles increasing by 79.45 and 130.08%, respectively, compared to un-grouting piles. Side grouting improves initial stiffness and ultimate side resistance, especially in fine sand, while tip grouting boosts tip resistance by over 2.4 times. The load-sharing ratio between side and tip resistance is also affected by grouting, with combined-grouting piles showing a more balanced distribution. Hyperbolic models effectively describe the load–displacement relationships for both side and tip resistance. The study provides enhancement coefficients for side and tip resistance in various soil layers, offering practical design guidance. The proposed load transfer method for settlement calculation aligns well with experimental data but underestimates bearing capacity of grouting piles in later loading stages. This research enhances understanding of the mechanism of grouting reinforcement for bored piles and provides insights for similar engineering applications.</p>

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Field Comparison of Vertical Bearing Capacity of Bored Piles with Various Post-Grouting Methods

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Chun Chen,
  • Junlou Wang,
  • Fei Quan,
  • Li Zhu,
  • Wei Sun,
  • Yang Wang

摘要

This study investigates the influence of different post-grouting methods on the vertical bearing performance of bored piles through field tests conducted on three types of piles: un-grouting, tip-grouting, and combined-grouting piles. The bi-directional O-cell test method was employed in a high-speed railway project in Jinan, China, with a focus on analyzing the load-settlement curves at the pile top and the distribution of side and tip resistances. Results show that post-grouting significantly enhances ultimate bearing capacity, with tip-grouting and combined-grouting piles increasing by 79.45 and 130.08%, respectively, compared to un-grouting piles. Side grouting improves initial stiffness and ultimate side resistance, especially in fine sand, while tip grouting boosts tip resistance by over 2.4 times. The load-sharing ratio between side and tip resistance is also affected by grouting, with combined-grouting piles showing a more balanced distribution. Hyperbolic models effectively describe the load–displacement relationships for both side and tip resistance. The study provides enhancement coefficients for side and tip resistance in various soil layers, offering practical design guidance. The proposed load transfer method for settlement calculation aligns well with experimental data but underestimates bearing capacity of grouting piles in later loading stages. This research enhances understanding of the mechanism of grouting reinforcement for bored piles and provides insights for similar engineering applications.