Uplift load-carrying capacity of single and group micropiles installed with inclined conditions

Doohyun Kyung, Junhwan Lee

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


In this study, the uplift load-carrying capacity of micropiles was investigated, focusing on the effect of various installation conditions including installation angle (θ), spacing (S), and group configuration. For this purpose, a series of uplift model load tests was conducted using single micropiles (SMP) and group micropiles (GMP). The uplift load capacity of both SMP and GMP increased with θ up to 30° but decreased for a higher installation angle of θ=45°. Micropile spacing had less effect on the uplift load capacity for GMP. The uplift load-carrying mechanism of inclined micropiles is proposed based on decomposed axial and lateral loads and resistance components. Based on the proposed load-carrying mechanism, axial and lateral load capacity ratios were proposed and adopted to formulate the uplift load-capacity equation for inclined micropiles. For GMP, the group-effect factor was proposed based on the reduction effect of group micropiles on the overall uplift load capacity. Full-scale uplift load tests were conducted to check the validity of the proposed method. Both SMP and GMP were constructed and tested. It was observed that the estimated results using the proposed method were in good agreement with the measured results.

Original languageEnglish
Article number04017031
JournalJournal of Geotechnical and Geoenvironmental Engineering
Issue number8
Publication statusPublished - 2017 Aug 1

Bibliographical note

Publisher Copyright:
© 2017 American Society of Civil Engineers.

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • General Environmental Science


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