Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Estimation of Pile Resistance Factor by CPT Based Pile Capacity

CPT결과를 이용한 항타말뚝 지지력 평가를 위한 저항계수 산정

  • Kim Dae-Ho (Dept. of Highways & Bridge, Daewoo Engrg. Co.) ;
  • Lee Jun-Hwan (Dept. of Civil Engrg., Yonsei Univ.) ;
  • Kim Bum-Joo (Dam Safety Research Center, Korea Institute of Water and Environment, Korea Water Resources Corporation)
  • 김대호 (대우엔지니어링 도로사업부) ;
  • 이준환 (연세대학교 사회환경시스템공학부) ;
  • 김범주 (한국수자원공사 수자원연구원 댐안전연구소)
  • Published : 2005.12.01
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Abstract

Application of Limit State Design in geotechnical engineering has become world-widely popular. While LRFD code in the North America presents geotechnical load and resistance factors, the values of resistance factors proposed by these methods are still unstable with limited application. CPT has been widely used for the pile design and various methods have been proposed to estimate the bearing capacity of piles. In this paper, resistance factors for representative pile design methods based on CPT results are evaluated. Field pile load test and CPT results were collected and analyzed in order to obtain necessary statistical data and resistance factors. Resistance factors of the base, shaft, and total capacity are estimated. From fisrt order second moment (FOSM) analysis, resistance factors of $0.30{\sim}0.55$ are estimated for total load capacity.

신뢰성 기반의 한계상태설계법(Limit State Design; LSD)의 지반공학적 적용은 세계적으로 확산추세이며, 북미지역의 경우 일부 시방서에 하중 및 저항에 의한 LRFD 설계법이 지반공학적 설계에 적용되고 있다. 그러나 지금까지 제안되어 온 지반공학적 저항계수는 상당히 포괄적인 값이며, 이와 관련된 연구는 아직까지 초기단계라 할 수 있다. 콘관입시험은 대표적인 현장시험으로 특히 말뚝 설계에서 유용하게 활용되고 있으며, 다양한 말뚝 지지력 산정법이 제시되어 왔다. 본 연구에서는 콘관입시험을 이용한 항타 말뚝 지지력 평가를 위한 저항계수를 산정하고자 한다. 이를 위하여 여러 지역에서 수행된 말뚝재하시험과 콘관입시험 결과를 수집하여 확률적 분석을 수행하였으며, 이를 종합하여 저항계수 산정에 적용하였다. 본 연구에서는 전체지지력뿐만 아니라 말뚝의 선단 및 주면 지지력 각각에 대한 저항계수 또한 도출하고자 하였다. 저항계수 산정 결과, 목표신뢰도지수 $2.0{\sim}2.5$의 범위에서 전체지지력에 대한 저항계수 $0.35{\sim}0.55$범위를 나타내었다.

Keywords

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