Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Estimation of Bearing Capacity for Open-ended Pile in Sands Considering Soil Plugging (II) - Applicability of New Design Equation -

사질토지반에서 폐색효과를 고려한 개단말뚝의 지지력 산정 (II) - 새로운 지지력 산정식의 적용성 -

  • 백규호 (관동대학교 이공대학 토목공학과)
  • Published : 2002.08.01
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Abstract

The bearing capacity of open-ended piles is affected by the degree of soil plugging, which is quantified by the incremental filling ratio, IFR. However, most design criteria for open-ended piles do not consider the variation of pile bearing capacity with IFR. In this study, new design equations for calculating the pile base and shaft load capacities, based on IFR value of the pile, were proposed using the results of model pile tests. A full-scale pile load test was also conducted on fully instrumented open-ended pile driven into gravelly sand. The IFR for the pile was continuously measured during pile driving. In order to check the accuracy of predictions made with the proposed equations, the equations were applied to two examples, including the pile load test preformed in this study. Based on the comparisons with the pile load tests results, the proposed equations appear to produce satisfactory predictions.

개단말뚝의 지지력은 관내토증분비(IFR)에 의해 정량화 될 수 있는 말뚝의 폐색정도에 큰 영향을 받는다. 그러나 대부분의 지지력 산정식들은 IFR에 따른 지지력의 변화를 고려하지 못하고 있는 실정이다. 본 연구에서는 모형말뚝시험의 결과에 근거하여 IFR을 이용한 개단말뚝의 지지력산정식을 제안하였다. 또한 자갈질 모래지반에서 각종 계측기가 부착된 실대형 개단말뚝을 이용하여 말뚝재하시험을 수행하였으며, 말뚝이 타입되는 동안 말뚝의 IFR을 연속적으로 측정하였다. 그리고 본 연구의 일부로 수행된 실대형 말뚝시험의 결과를 포함한 두 가지 경우의 말뚝재하시험 결과를 이용하여 새로 제안된 지지력산정식의 정확성을 평가하였다. 말뚝의 지지력에 대한 측정치와 예측치의 비교를 통하여 본 연구에서 제안된 지지력산정식은 만족스러운 예측결과를 주는 것으로 나타났다.

Keywords

References

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