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Axial Behavior of Pressure Grouted Helical Piles Installed in Marine Soft Clay Based on Full-Scale Field Tests

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Abstract

Pressure grouted helical pile is an innovative soil–cement helical pile constructed by applying pressured grouting during the installation of the helical pile. Compression and tension field tests were presented to investigate the axial behavior of pressure grouted helical piles installed in clay deposits. Six compression and four tension tests were conducted, including three un-grouted helical piles, five pressure grouted helical piles, and two hollow-bar micropiles. From the observation of the excavated piles, a continuous soil–cement column could be created with a diameter larger than the helix plate. The load transfer analysis based on the strain gauge measurements showed that the pressure grouted helical piles increased the pile resistance in the clay layers. The maximum skin friction of the mud clay under compression was improved by 75%. The larger soil–cement column diameter and higher ultimate skin friction strengthened the pile stiffness and contributed to the increase of the overall axial capacities. In this study, the axial capacities of the pressure grouted helical piles were approximately two times that of the un-grouted helical piles. The overall results demonstrated that the pressure grouted helical pile was an enhanced construction method that can improve axial capacities in marine soft clay compared to the un-grouted helical piles.

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Data Availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

In particular, the authors would express our appreciation to friends and colleagues who helped in the field tests. This research is supported by the funding from Natural Science Research of Jiangsu Higher Education Institutions of China through award number 21KJB560016.

Funding

This research is supported by the funding support provided by State Grid Corporation of China through contract number J2019113. Author Yunhan Huang has received research funding from Natural Science Research of Jiangsu Higher Education Institutions of China through award number 21KJB560016.

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Authors and Affiliations

  1. School of Civil and Ocean Engineering, Jiangsu Ocean University, Lianyungang, China

    Yunhan Huang, **aoxuan Zhuang, Peipei Wang & Zhongling Zong

  2. Jiangsu Ocean Engineering Research Center for Intelligent Infrastructure Construction, Lianyungang, China

    Zhongling Zong

Authors
  1. Yunhan Huang
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  2. **aoxuan Zhuang
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  3. Peipei Wang
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  4. Zhongling Zong
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Yunhan Huang, **aoxuan Zhuang, Peipei Wang and Zhongling Zong. The first draft of the manuscript was written by Yunhan Huang and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Peipei Wang.

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Huang, Y., Zhuang, X., Wang, P. et al. Axial Behavior of Pressure Grouted Helical Piles Installed in Marine Soft Clay Based on Full-Scale Field Tests. Geotech Geol Eng 40, 5799–5812 (2022). https://doi.org/10.1007/s10706-022-02250-2

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