한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제32권5호
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  • Pages.27-36
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  • 2016
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  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
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개단말뚝의 폐색효과 영향인자 분석

Influence Factors on the Degree of Soil Plugging for Open-Ended Piles

  • 정상섬 (연세대학교 토목환경공학과) ;
  • 고준영 (연세대학교 토목환경공학과)
  • 투고 : 2016.03.23
  • 심사 : 2016.05.02
  • 발행 : 2016.05.31
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초록

개단말뚝은 폐색정도에 따라 지지력이 다르게 나타나므로 개단말뚝 설계시 폐색효과를 고려하여야 한다. 이에 본 연구에서는 대변형 수치해석 기법 중 하나인 Coupled Eulerian-Lagrangian(CEL) 기법을 이용하여 말뚝의 항타 관입을 모사하여 사질토, 점성토 지반조건, 단일 지반의 탄성계수, 말뚝 선단지지 조건, 다층지반 조건에 대한 영향 분석을 수행하였다. 해석 결과 사질토 지반에서 점성토 지반보다 폐색정도가 큰 것으로 확인되었고, 사질토의 경우 지반의 강성이 클수록 폐색정도가 증가하는 것으로 나타났다. 말뚝 선단이 지지층에 근입된 경우, 그렇지 않은 경우보다 정지토압계수가 크게 나타나 폐색정도가 큰 것으로 확인되었다. 또한, 지반의 배열이 이질층인 경우 지반강성에 따라 정지토압계수가 다르게 결정됨을 알 수 있었다. 따라서 지반조건, 지층 등에 따라 정지토압계수를 다르게 적용하여 관내 내부마찰력을 산정할 필요가 있으며 이를 반영한 합리적인 지지력 산정을 할 필요가 있음을 알 수 있었다.

This paper presents the investigation of the major influence factors on the degree of soil plugging for open-ended piles based on the Coupled Eulerian-Lagrangian (CEL) numerical technique. The main objective of this study was to investigate the effect of soil plugging on the response of piles in various conditions. Through comparison of the results of field load tests, the CEL methodology was found to be in good agreement with the general trend observed by in situ measurement. Additionally, the parametric studies were performed by controlling the soil conditions, soil elastic moduli, end-bearing conditions and multi layers. It was found that the degree of soil plugging for sand layers was greater than that of clay layers. Also, the degree of soil plugging increased with an increase in both the soil stiffness and length of pile embedded in the bearing layer.

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참고문헌

  1. ABAQUS. (2013), ABAQUS user's and theory manuals, Version 6.13. rhode island: Hibbitt, Karlsson & Sorensen, Inc.
  2. Beringen, F. L., Windle, D., and Van Hooydonk, W. R. (1979), "Results of Loading Tests on Driven Piles in Sand", Proceedings of the Conference on Recent Development in the Design and Construction of Piles, ICE, London, Vol.21-22, pp.213-225.
  3. Bowles, J. E. (2002), Foundation Analysis and Design, McGraw-Hill, New York, USA.
  4. Brucy, F., Meunier, J., and Nauroy, J.F. (1991), "Behavior of Pile Plug in Sandy Soils during and After Driving", Proceedings of 23rd Annual Offshore Technology Conference, Houston, 1, pp.145-154.
  5. De Nicola, A. and Randolph, M.F. (1997), "The Plugging behaviour of Driven and Jacked Piles in Sand", Geotechnique, Vol.47, No.4, pp.841-856. https://doi.org/10.1680/geot.1997.47.4.841
  6. Goble, G. G., Raushe, F. R., and Likins, G. E. (1980), "The Analysis of Pile Driving-a State-of-the-art", Proceedings of International Seminar on the Application of Stress-Wave Theory on Piles, Stockholm, Sweden, pp.131-162.
  7. Jeong, S. S., Lee, K. W., Kim, Y. M., and Kim, J. H. (2014), "A Study on the Landslide/debris Flow based on Large Deformation Analysis", Proceedings of the 40th KSCE Conference, Daegu, Korea, pp.271-272.
  8. Jeong, S.S., Lee, K.W., and Ko. J.Y. (2015), "A Study on the 3D Analysis of Debris Flow based on Large Deformation Technique (Coupled Eulerian-Lagrangian)", Journal of the Korean Geotechnical Society, Vol.31, No.12, pp.45-57.
  9. Kim, Y. H. and Jeong, S. S. (2014), "Analysis of Dynamically Penetrating Anchor based on Coupled Eulerian-Lagrangian (CEL) Methods", Journal of the Korean Society of Civil Engineers, Vol.34, No.3, pp.895-906. https://doi.org/10.12652/Ksce.2014.34.3.0895
  10. Kishida, H. (1967), "The Ultimate Bearing Capacity of Pipe Piles in Sand", Proceedings of the 3rd Asian Regional Conference on Soil Mechanics and Foundation Engineering, pp.196-199.
  11. Kishida, H. and Isemoto, N. (1977), "Behavior of Sand Plugs in Open Ended Steel Pipe Piles", Proceedings of the 9th International Conference on Soil Mechanics and Foundation Engineering, Tokyo, Japan, Vol.1, pp.601-612.
  12. Klos, J. and Tejchman, A. (1977), "Analysis of behavior of Tubular Piles in Subsoil", Proceedings of the 9th International Conference on Soil Mechanics and Foundation Engineering, Tokyo, Japan, pp. 605-608.
  13. Klos, J. and Tejchman, A. (1981), "Bearing Capacity Calculation for Pipe Piles", Proceedings of the 10th International Conference on Soil Mechanics and Foundation Engineering, Stockholm, Sweden, Vol.2, pp.751-754.
  14. Ko. J. Y. (2015), "Evaluation of Bearing Capacity for Open-Ended Piles with Soil Plugging", Ph.D. thesis, Yonsei University, Seoul.
  15. Ko, J. Y. and Jeong, S. S. (2014), "Analysis of Plugging Effect for Open-ended Piles based on Field Tests", Journal of Korean Geotechnical Society, Vol.30, No.12, pp.51-61. https://doi.org/10.7843/KGS.2014.30.12.51
  16. Ko, J. Y. and Jeong, S. S. (2015), "Plugging Effect of Open-ended Piles in Sandy Soil", Canadian Geotechnical Journal, Vol.52, No.5, pp.535-547. https://doi.org/10.1139/cgj-2014-0041
  17. Ko. J. Y., Jeong, S. S., and Lee, S. Y. (2015), "A Study on the 3D Analysis of Driven Pile Penetration based on Large Deformation Technique (Coupled Eulerian-Lagrangian)", Journal of the Korean Geotechnical Society, Vol.31, No.8, pp.29-38.
  18. Ko, J. Y, Jeong, S. S., and Lee, J. K. (2016), "Large Deformation FE Analysis of Driven Steel Pipe Piles with Soil Plugging", Computers and Geotechnics, Vol.71, pp.82-97. https://doi.org/10.1016/j.compgeo.2015.08.005
  19. Kraft, L. M. Jr. (1991), "Performance of Axially Loaded Pipe Piles in Sand", Journal of Geotechnical Engineering, Vol.117, No.2, pp. 272-296. https://doi.org/10.1061/(ASCE)0733-9410(1991)117:2(272)
  20. Lee, S. Y. (2016), "A Study on the Excavation Damage Zone (EDZ) under TBM Excavation", M.S. thesis, Yonsei University, Seoul.
  21. Matsumoto, T. and Takei, M. (1991), "Effects of Soil Plug on behavior of Driven Pipe Piles", Soils and Foundations, Vol.31, No.2, pp.14-34. https://doi.org/10.3208/sandf1972.31.2_14
  22. Nauroy, J. F. and Le Tirant, P. (1983), "Model Tests of Calcareous sands", Proceedings of conference on geotechnical practice in offshore engineering, Austin, TX., pp.27-39.
  23. Paik, K. H., Salgado, R., Lee, J. H., and Kim, B. J. (2003), "Behavior of Open- and Closed-ended Piles Driven into Sands", Journal of Geotechnical and Geoenvironmental Engineering, Vol. 129, No.4, pp.296-306. https://doi.org/10.1061/(ASCE)1090-0241(2003)129:4(296)
  24. Paikowsky, S. G. (1989), "A Static Evaluation of Soil Plug behavior with Application to the Pile Plugging Problem", D.Sc. thesis, Massachusetts Institute of Technology Cambridge, MA.
  25. Paikowsky, S.G., Whitman, R.V., and Baligh, M.M. (1989), "A New Look at the Phenomenon of Offshore Pile Plugging", Marine Georesources & Geotechnology, Vol.8, pp.213-230. https://doi.org/10.1080/10641198909379869
  26. Paikowsky, S. G. (1990), "The Mechanism of Pile Plugging in Sand", Proceedings of the 22nd Offshore Technology Conference, Houston, TX, pp.593-604.
  27. Qiu, G., Henke, S., and Grabe, J. (2011), "Application of a Coupled Eulerian-Lagrangian Approach on Geomechanical Problems Involving Large Deformations", Computers and Geotechnics, Vol.38, pp.30-39. https://doi.org/10.1016/j.compgeo.2010.09.002
  28. Randolph, M. F., May, M., Leong, E. C., Hyden, A. M., and Murff, J. D. (1990), "Soil Plug Response in Open-ended Pipe Piles", Journal of Geotechnical Engineering, Vol.118, No.5, pp.743-759. https://doi.org/10.1061/(ASCE)0733-9410(1992)118:5(743)
  29. Szechy, C. H. (1959), "Tests with Tubular Piles", Acta Technica, Hungarian Academy of Science, Vol.24, pp.181-219.
  30. Yamahara, H. (1964), "Plugging Effects and Bearing Mechanism of Steel Pipe Piles", Transportation of the Architectural Institute of Japan, Vol.96, pp.28-35. https://doi.org/10.3130/aijsaxx.96.0_28