Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Model Tests of Pile Groups in Sand

실내모형실험을 통한 군말뚝기초의 거동분석

  • 정상훈 (연세대학교 공과대학 토목공학과) ;
  • 정상섬 (연세대학교 공과대학 토목공학과)
  • Published : 2001.12.01
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Abstract

In this study the behavior of pile groups is investigated experimentally. Special attention is given to the load transfer characteristics of pile groups and to the evaluation of the group effects under vertical and horizontal loadings. In the laboratory experiments, vertical and lateral loadings were imposed on model piles in sand. Model piles made of PVC embedded in Joomoonjin sand were used in this study. Pile arrangements($2\times2,\; 3\times3$) and pile spacings(2.5D, 5.OD, 7.5D) were considered. Load-transfer curves(t-z, q-z and p-y curves), load-deflection curves and group interaction factors were obtained from the experimental results. The group interaction factors under both vertical and horizontal loadings were proposed for the cases of $2\times2\; and\; 3\times3$ pile groups with varying ratios of pile spacings. p-multipliers in this study were found for the individual piles in $2\times2\; and\; 3\times3$ pile groups.

본 연구에서는 수직 및 수평하중을 받는 군말뚝의 배열 및 중심간격을 고려한 실내모형실험을 수행하여 군말뚝기초의 거동특성을 분석하였다. 모형말뚝은 PVC말뚝을 사용하였으며 모형지반은 주문진표준사를 이용해 조밀한 사질토 지반(Dr=73%)으로 조성하였다. 말뚝의 배열은 $2\times2,\; 3\times3$ 배열, 말뚝중심간격은 말뚝직경의 2.5, 5.0, 7.5 배인 경우를 고려하였다. 실험결과 수직하중을 받는 말뚝에서는 두부에서의 수직하중-침하량곡선, 하중전이함수인 주면마찰락력-변위곡선(t-z 곡선)과 선단지지력-변위곡선(q-z 곡선)을 구하였으며, 수평하중을 받는 말뚝에서는 두부에서의 수평하중-수평변위곡선, 하중전이함수인 지반반력-변위곡선(p-y곡선)을 구하였고 이를 토대로 말뚝의 배열 및 중심간격에 따른 군말뚝계수를 제안하였다. 또한 수평하중을 받는 군말뚝의 각 열에 대해 상호작용계수(P-multiplier)를 산정하였다.

Keywords

References

  1. 한국지반공학회 2000 가을학술발표회 논문집 P-multiplier 방법을 적용한 군말뚝의 수평거동 예측 김병탁;김영수
  2. 석사학위논문 측방변형을 받는 수동군말뚝의 거동분석 장서용
  3. 한국지반공학회 2001 봄학술발표회 논문집 말뚝-캡 강성을 고려한 군말뚝 기초의 해석 정상섬;원진오;허정원
  4. 개선된 강관말뚝의 설계와 시공
  5. The pressuremeter Briaud, J. S.
  6. Journal of Soil Mechanics and Foundation Engineering v.90 no.SM2 Lateral resistancd of piles in cdhesive soils Broms, B. B.
  7. Journal of Geotechnical Engineering v.114 no.11 Lateral load behavior of pile group in sand Brown, D. A.;Reese, L. C.;Morrison, Clark
  8. Journal of Soil Mechanics and Foundation Engineering v.92 no.2 Load transfer for axially loaded piles in clay Coyle. H. M.;Reese, L. C.
  9. Journal of Soil Mechanics and Foundation Engineering v.93 no.6 Skin friction for steel piles in sand Coyle, H. M.;Sulaiman, I. H.
  10. Deep Foundations on Bored and Augar Piles Group action between vertical piles under horizontal loads Franke, E.;W. F. Van Impe(ed.)
  11. Journal of Geotechnical Engineering Division v.2 no.2 full-scale lateral load tests of pile groups Kim, J. B.;Brungraber, R. J.
  12. Journal of the Soil Mechanics and Foundations Division v.86 no.SM5 Generalized Solutions for Laterally Loaded Piles Matlock. H.;Reese, L. C.
  13. Journal of Geotechnical and Geoenvironmental Engineering v.124 no.10 Centrifuge testing of large laterally loaded pile groups in sands McVay(et al.)
  14. Journal of Geotechnical and Geoenvironmental Engineering v.102 no.GT3 Bearing Capacity and Settlement of Pile Foundations Meyerhof, G. G.
  15. Journal of Geotechnical Engineering v.115 no.3 Lateral pile interaction factors in submerged sand Ochao, M.;O'Neill, M. W.
  16. Indian Geotechnical Journal v.13 Lateral load-deflection behavior of pile groups Pise. P. J.
  17. Ph.D thesis Behavior of pile groups sybjected to lateral loads Prakash, S.
  18. Journal of Geotechnical and Geoenvironmental Engineering v.124 no.6 Influence of Rigidity on Laterally Loaded Pile Groups in Marine Clay Rao, S. N.;Ramakrishna, V. G. S. T.;Rao, M. B.
  19. Deep foundations on bored and augar pailes: Proc. 1st International Geotechnical Siminar on Deep Foundation on Bored and Augar Piles Field load tests of drilled shafts Reese, L. C.;O'Neill, M. W.
  20. Computer program GROUP for Windows user's manual (version 4.0) Reese, L. C.;Wang S. T.;Arrellaga, J. A.;Hendrix, J.
  21. Journal of Geotechnical and Geoenvironmental Engineering v.123 no.12 Evaluation of laterally loaded pile group at Roosevelt Bridge Ruesta, P. F.;Townsend, F. C.
  22. Civ. and Envir. Engrg. CEG.97-04 Passive resistance and lateral load capacity of a full-scale fixed-head pile group in clay Sparks, A.;Rollins, K. M.
  23. Soil mechanics in engineering practice Terzaghi, K.;Peck, R. B.