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2020 Vol.30, Issue 1 Preview Page

Research Article

Evaluation of Skin Friction Using Tensile Load Testing of CPR Piles

CPR 말뚝의 인발재하시험을 통한 주면마찰력 평가

Chin-Surk Ko1
,
Jung-Han Kim2
,
Jeongdu Noh3
,
Seong-Seung Kang1*
고 진석1
,
김 정한2
,
노 정두3
,
강 성승1*
1Professor, Department of Energy and Resources Engineering, Chosun University
2CEO, Hyowon E&C Co., Ltd.
3Ph.D. Student, Department of Energy and Resources Engineering, Chosun University
1조선대학교 에너지자원공학과 교수
2효원이엔씨(주) 대표
3조선대학교 에너지자원공학과 박사과정
*Corresponding Author
31 March 2020. pp. 59-69
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Abstract

Pull-out load tests were performed on a CPR (Compaction grouting compound Pile with Reinforce) test pile, with skin friction being evaluated by the yield load and allowable bearing capacity after analyzing load-displacement curves and load-settlement curves. Results of the CPR test piles analyzed from the load-displacement curves show that the yield load and allowable bearing capacity of the large-diameter CPR test pile were about 1.4 times larger than that of the small-diameter pile. Results of the load-settlement curves reveal that the allowable bearing capacity of the CPR test pile with diameter of D500 was 1.2~2.1 times greater than that of the pile with diameter of D400. However, the allowable bearing capacity calculated using Fuller’s analysis differed substantially from that determined using the P (Pull-out load) - S (Settlement) and log P - log S curves. Therefore, calculation of the allowable bearing capacity using Fuller’s analysis is shown to be inappropriate.

Keywords
CPR test pile
pull-out load test
yield load
allowable bearing capacity
skin friction

CPR 시험말뚝에 대해 인발재하시험을 실시하고, 하중-변위 곡선과 하중-침하량 곡선을 분석한 후 항복하중과 허용지지력을 산정하여 주면마찰력을 평가하였다. 하중-변위 곡선으로부터 분석된 CPR 시험말뚝의 결과에 의하면, CPR 시험말뚝의 직경이 큰 경우의 항복하중과 허용지지력이 작은 경우보다 약 1.4배 이상 크게 나타났다. 하중-침하량 곡선으로 부터 분석된 결과에 의하면, CPR 시험말뚝의 직경 D500의 허용지지력이 D400보다 약 1.2~2.1배 큰 것으로 나타났다. 하지만, Fuller 분석에 의해 산정된 허용지지력은 P-S 곡선과 log P - log S 곡선에 의해 산정된 허용지지력과 큰 차이를 보여, Fuller 분석에 의한 허용지지력 산정은 적절하지 않은 것으로 판단되었다.

키워드
CPR 시험말뚝
인발재하시험
항복하중
허용지지력
주면마찰력
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 30
  • No :1
  • Pages :59-69
  • Received Date : 2020-03-03
  • Revised Date : 2020-03-10
  • Accepted Date : 2020-03-10
  • DOI :https://doi.org/10.9720/kseg.2020.1.059
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