• Title/Summary/Keyword: PHC auger-drilled piles

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Evaluation of Bearing Capacity on PHC Auger-Drilled Piles Using Artificial Neural Network (인공신경망을 이용한 PHC 매입말뚝의 지지력 평가)

  • Lee, Song;Jang, Joo-Won
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.10 no.6
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    • pp.213-223
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    • 2006
  • In this study, artificial neural network is applied to the evaluation of bearing capacity of the PHC auger-drilled piles at sites of domestic decomposed granite soils. For the verification of applicability of error back propagation neural network, a total of 168 data of in-situ test results for PHC auger-drilled plies are used. The results show that the estimation of error back propagation neural network provide a good matching with pile test results by training and these results show the confidence of utilizing the neural networks for evaluation of the bearing capacity of piles.

End Bearing Capacity of Pile Tip-enlarged PHC Piles in Weathered Rock (풍화암에 근입된 선단확장형 PHC 말뚝의 선단지지력)

  • Yoo, Chung-Sik;Heo, Kab-Soo;Song, Ki-Yong;Kim, Sun-Bin
    • Journal of the Korean Geotechnical Society
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    • v.23 no.1
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    • pp.23-37
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    • 2007
  • Recently a concept of pile-tip enlarged PHC pile (Ext-PHC pile), for use in the auger-drilled construction method, has been developed and is being implemented in practice. A series of field axial load tests on both PHC and Ext-PHC piles were conducted at an experimental site. In addition, a parametric study on a number of influencing factors was made using a validated finite element model. The field axial load tests indicated an enhanced load-settlement characteristics for the Ext-PHC piles compared with the PHC piles, giving approximately 50% increase in the end bearing capacity. Also found in the results of the parametric study was that the increase in the end bearing capacity of Ext-PHC piles slightly varies with the mechanical properties of supporting ground as well as pile length, in the range of 1.25 to 1.4 time that of PHC. Overall, the results of the field tests as well as the numerical study confirmed that the end bearing capacity of PHC pile can be improved by the concept of.Ext-PHC pile.