Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Applicability of CPT-based Toe Bearing Capacity of PHC Driven Piles

PHC 항타말뚝에 대한 CPT 선단 지지력 산정식의 적용성

  • ;
  • 정성교 (동아대학교 토목공학과) ;
  • 김성렬 (동아대학교 토목공학과)
  • Received : 2009.10.06
  • Accepted : 2009.11.20
  • Published : 2009.12.31
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Abstract

As CPT penetration tends to show a similar behavior to that of pile driving, a number of methods for estimating the toe bearing capacity of piles based on CPT data have been proposed. To evaluate the applicability of the methods in this country, a total of 172 dynamic load tests data on PHC piles and 82 CPT data at a site in the Nakdong River estuary were collected. A specific four-step procedure was adopted for the selection of the reliable data, and statistical techniques were then applied to the analysis of the applicability. The results indicated that among a total of 10 CPT-based methods applied, the best one is the Aoki method (1975), followed by the LCPC (1982), ICP (2005) methods and others.

CPT의 관입과 말뚝의 항타는 그들의 거동이 아주 유사하기 때문에 CPT 결과를 이용한 말뚝의 지지력 예측방법이 많이 제안되어 있다. 본 연구에서는 CPT 결과를 이용한 선단지지력 산정공식의 국내 적용성을 분석하기 위하여 낙동강 하구 대심도 연약지반 현장에서 시공된 PHC 항타말뚝을 대상으로 총 172본의 동재하시험 자료와 82개소의 CPT 자료를 수집하였다. 신뢰성 높은 자료 선정을 위해 4단계의 보정절차를 거쳤으며, 통계적 기법을 이용하여 각 공식의 적용성을 분석하였다. 그 결과, 총 10가지의 공식 중에서 Aoki 방법(1975), LCPC 방법(1982), ICP 방법(2005)의 순서로 그 적용성이 높은 것으로 나타났다.

Keywords

References

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