Estimation of axial load capacity for bored tapered piles using CPT results in sand

Junhwan Lee, Kyuho Paik, Deahong Kim, Sungwuk Hwang

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Tapered piles in comparison to cylindrical piles can be beneficial in terms of the load capacity. In this paper, estimation of the load capacity for tapered piles using cone penetration test (CPT) resistance was investigated. Fourteen calibration chamber load tests using different pile types and six CPTs were conducted under various soil conditions. From the calibration chamber test results, the total, base, and shaft load capacities were analyzed in terms of soil conditions and taper angle. To evaluate CPT-based load capacity of tapered piles, normalized base and shaft resistances were obtained from normalized unit load-settlement curves. Based on the normalized base and shaft resistances, design equations that can be used to evaluate the base and shaft resistances of tapered piles were proposed. The proposed method is valid for sands of medium to dense conditions, while it may result in unconservative predictions for loose sands. To check the accuracy of the proposed method, field load tests using both cylindrical and tapered piles were conducted and compared with the predictions using the proposed method. A simplified approach using an equivalent cylindrical pile was also investigated and compared.

Original languageEnglish
Article number006909QGT
Pages (from-to)1285-1294
Number of pages10
JournalJournal of Geotechnical and Geoenvironmental Engineering
Issue number9
Publication statusPublished - 2009 Sept

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Geotechnical Engineering and Engineering Geology


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