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<p>This study focused on analyzing the bearing capacity of six cast-in-place bored piles located in the City Square at Ronghe East Station in Nanning through static load testing using the Osterberg cell (O-cell) method and the bearing deformation characteristics of the combined grouting of the pile side and end in a highly weathered mudstone layer. A load–settlement calculation method for post-grouting piles in a highly weathered mudstone layer was established using the load transfer model of the pile-side softening hyperbola and pile-end hardening curve, and the accuracy of the method was subsequently verified through test pile modeling of an actual engineering case. The test results showed that the bearing capacities of the three grouted and ungrouted test piles met the design bearing requirements for highly weathered mudstone and exhibited the characteristics of an end-bearing friction pile. The initial stiffness and ultimate lateral friction enhancement coefficients of the pile side and end with grouting in highly weathered mudstone were 2.13, 1.47, 2.51, and 1.97, respectively. The use of combined grouting, which involves simultaneous grouting at both the pile side and end, can significantly increase the bearing capacity by a factor of approximately 1.3 times; thus, this approach can improve the bearing performance of pile foundations economically and efficiently.</p>

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Investigation on the post-grouting bearing capacity of bored piles in a highly weathered mudstone layer based on the O-cell test method

  • 期刊论文

  • 发表日期：

    2025年3月25日

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  • Xiaoduo Ou,
  • Runhui Sang,
  • Lu Bai,
  • Jie Jiang

摘要

This study focused on analyzing the bearing capacity of six cast-in-place bored piles located in the City Square at Ronghe East Station in Nanning through static load testing using the Osterberg cell (O-cell) method and the bearing deformation characteristics of the combined grouting of the pile side and end in a highly weathered mudstone layer. A load–settlement calculation method for post-grouting piles in a highly weathered mudstone layer was established using the load transfer model of the pile-side softening hyperbola and pile-end hardening curve, and the accuracy of the method was subsequently verified through test pile modeling of an actual engineering case. The test results showed that the bearing capacities of the three grouted and ungrouted test piles met the design bearing requirements for highly weathered mudstone and exhibited the characteristics of an end-bearing friction pile. The initial stiffness and ultimate lateral friction enhancement coefficients of the pile side and end with grouting in highly weathered mudstone were 2.13, 1.47, 2.51, and 1.97, respectively. The use of combined grouting, which involves simultaneous grouting at both the pile side and end, can significantly increase the bearing capacity by a factor of approximately 1.3 times; thus, this approach can improve the bearing performance of pile foundations economically and efficiently.