Geotechnical Engineering (한국지반공학회지:지반)

Korean Geotechnical Society (한국지반공학회)
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A Study on the Estimation of Ultimate Bearing Capacity of Granular Group Piles

조립토 군말뚝의 극한지지력 평가에 관한 연구

  • 김홍택 (정회원, 홍익대학교 공과대학 토목공학과) ;
  • 강인규 (홍익대학교 대학원 토목공학과, 정회원, (주)브니엘컨설턴트 책임연구원, 에메랄드 소프트컨설턴트)
  • Published : 1998.10.01
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Abstract

In the present study, a procedure to predict the depth from the ground surface to the center of bulging failure zone in each of the square granular group piles under a rigid mat foundation is proposed. This analytical procedure is established on the basis of the conical modeling of bulging failure shape and the replacement ratio of soft foundation soils. considering the effect of a share of procedure to estimate the ultimate cylindrical pressure in the area reinforced with granular piles and the ultimate bearing capacity of each of granular piles in group. This analytical procedure is also established on the basis of the pre-determined depth to the zone of bulging failure and an iterative solution technique. Finally the analytical procedures proposed in this study are verified by analyzing the results of 3D finite element analyses, and the predictions of ultimate bearing capacity of granular piles are compared with the results obtained from the tests, empirical equation and 3D finite element analyses.

본 연구에서는, 조립토 단말뚝에 대한 지배적인 파괴형태를 구분짓는 한계깊이 즉, 팽창파괴 중 심부까지의 깊이에 대한 정량적 예측기법을 우선 제시하고, 또한 강성매트기초 하부에 정방형 군형태로 설치되는 조립토 말뚝에 대해, 1) 상부재하하중에 대한 기초지반의 하중분담 봉과를 고려하고, 원추형상의 모델링 및 원지반의 치환율 등을 근거로 각 말뚝의 팽창파괴 중심부까지의 깊이를 결정하기 위한 기법, 2) 인접 말뚝에 의한 훤지반와 치환효과가 고려된 합성탄성계수 개념을 토대로 조립토 말뚝에 의해 보강된 지반의 극한공동압을 평가하는 기법 등이 아울러 제시되었고, 최종 수행되었다.

Keywords

References

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