All Issue

2019 Vol.18, Issue 2 Preview Page

Research Article

A Study on Strength Reduction Factor of Pile-soil Interface for Evaluation of Pile Pullout Resistance by Soil Condition

지반조건에 따른 말뚝의 인발저항 평가를 위한 말뚝-지반 경계면 강도감소계수 고찰

Seung-Kyong You1
,
Heesoo Shin2
,
Kwang-Wu Lee3
,
Jeong-Jun Park4
,
Choong-Lak Choi5
,
Gigwon Hong6*
유 승경1
,
신 희수2
,
이 광우3
,
박 정준4
,
최 충락5
,
홍 기권6*
1Member, Professor, Dept. of Civil Engineering, Myongji College, 134 Gajwa-ro, Seodaemun-gu, Seoul 03656, Republic of Korea
2Member, Director, Institute of Technology Research and Development, UCI Tech co. Ltd., 313 Inha-ro, Michuhol-gu, Incheon 22227, Republic of Korea
3Member, Senior researcher, Infra safety Institute, Korea Institute of Civil engineering and building Technology, 283 Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do 10223, Republic of Korea
4Member, Principal Researcher, Incheon Disaster Prevention Research Center, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon 22012, Republic of Korea
5Member, Managing Director, Geotechnical Engineering Depatment, Pyunghwa Engineering Consultants, Pyunghwa Bldg, 454 Gwanak-daero, Dongan-gu, Anyang-si, Gyeonggi-do 13949, Republic of Korea
6Member, Director, Institute of Technology Research and Development, Korea Engineering & Construction, 150 Jojeong-daero, Hanam-si, Gyeonggi-do 12930, Republic of Korea
* Corresponding Author
30 June 2019. pp. 45-54
PDF XML Citation
Abstract

본 연구에서는 원지반의 상대밀도와 세립분 함유율의 조건에 따른 말뚝의 인발거동 특성 규명을 위하여, 유한요소해석을 수행하였다. 수치해석에서는 말뚝과 지반 경계에서의 전단거동을 원활히 모사하기 위해서 경계요소와 경계면 강도감소계수(Rinter)를 부여하였으며, 그 결과를 기존의 실험적 연구결과(You et al., 2018)와 비교함으로써 본 수치해석 방법의 신뢰성을 검증하였고, 말뚝-지반 경계면에서의 변형 특성과 함께 경계요소에 대한 Rinter값의 결정방법을 제시하였다. 해석 결과, 본 연구에서 적용된 해석모델을 이용한 수치해석은 말뚝의 인발모형실험에 의한 말뚝과 지반의 경계면 특성을 적절하게 모사하였다. 또한 제시된 Rinter의 적용에 있어서, 반드시 지반의 상대밀도와 세립분 함유율 조건을 고려해야 할 필요가 있음을 확인하였다.

This paper describes the results of finite element analysis (FEA), in order to investigate a characteristics of pile pullout behavior according to the conditions of the relative density and fines content in original ground. In the FEA, a boundary elements and strength reduction factors (Rinter) on pile-soil interface were applied to simulate appropriately the shear behavior at the pile-soil interface, and then the reliability of numerical analysis method was verified by comparison of FEA results and previous experimental research(You et al., 2018). In addition, a the deformation characteristics at the pile-soil interface and determination method of Rinter value was laid out. The results showed that the FEA, based on the analytical model applied in this study simulates appropriately the characteristics of the pile-soil interface by pullout model test of pile. In order to apply the suggested Rinter value, it is necessary to consider the condition of the relative density and the fines content in ground.

Keywords
Pile pullout resistance
Finite element analysis (FEA)
Pile-soil interface
Strength reduction factor
Skin friction

References
1
Benz, T. (2007), Small-Strain Stiffness of Soils and its Numerical Consequences, Ph.D. Thesis, University of Stuttgart.
2
Cho, S. H. and Kim, H. M. (2010), “Characteristics on Pullout Behavior of Belled Tension Pile in Sandy Soils”, Journal of the Korea Academia-Industrial cooperation Society, Vol.11, No.9 pp.3599-3609. (in Korean with English summary)
10.5762/KAIS.2010.11.9.3599
3
Das, B. M. and Seeley, G. R. (1975), “Uplift Capacity of Buried Model Piles in Sand”, Journal of the Geotechnical Engineering Division, Vol.101, Issue 10, pp.1091-1094.
4
Hong, G., You, S. K., Shin, H., Lee, K. and Choi, C. (2019), “A Study on Numerical Analysis for Pullout Behavior Prediction of Pile”, 2019 Spring Geosynthetics Conference, Korea, pp.108-109. (in Korean)
5
Hong, W. P., Yea, G. G. and Lee, J. H. (2005), “Evaluation of skin friction on large drilled shaft”, Journal of the Korean geotechnical society, Vol.21, No.1, pp.93-103. (in Korean with English summary)
6
Hong, W., Lee, J., and Chai, S. (2008), “Bearing Capacity of SDA Augered Piles in Various Grounds Depending on Water-cement Ratio of Cement Milk”, Journal of Korean Geotechnical Society, Vol.24, No.5, pp.37-54. (in Korean with English summary)(in Korean with English summary)
7
Lee, H. J. and Kim, H. T. (2006a), “Numerical Analyses for Evaluating Factors which Influence the Behavioral Characteristics of Side of Rock Socketed Drilled Shafts”, Journal of The Korean Society of Civil Engineers, Vol.26, No.6c, pp.395-406. (in Korean with English summary)
8
Lee, H. J. and Kim, H. T. (2006b), “Numerical Analyses on the Behavioral Characteristics of Side of Drilled Shafts in Rocks and Suggestion of Design Charts”, Journal of The Korean Society of Civil Engineers, Vol.26, No.6c, pp.407-419. (in Korean with English summary)
9
Lee, S. J. (2013), “Analysis of Diameter Effects on Skin Friction of Drilled Shafts in Sand”, Journal of the Korean geotechnical society, Vol.29, No.1, pp.161-170. (in Korean with English summary)
10.7843/kgs.2013.29.1.161
10
Lim, H., Park, Y., and Park, J. (2002), “Investigation of Characteristics and Suggestion of Evaluation Formulae for Skin Resistance of SIP”, Journal of the Korean Geoenvironmental Society, Vol.3, No.2, pp.15-21. (in Korean with English summary)(in Korean with English summary)
11
Lim, Y. J. and Seo, S. H. (2002), “Uplift Testing and Load-transfer Characteristics of Model Drilled Shafts in Compacted Weathered Granite Soils”, Journal of the Korean Geotechnical Society, Vol.18, No.4, pp.105-117. (in Korean with English summary)
12
Meyerhof, G. G. (1959), “Compaction of Sands and Bearing Capacity of Piles”, J. S. Mech. Fdtn. Div, ASCE, pp.1-29.
13
Meyerhof, G. G. (1976), “Bearing Capacity and Settlement of Pile Foundations”, Journal of Geotechnical Engineering, ASCE, 102, No.GT-3, pp.197-228.
14
Meyerhof, G. G. and Adams, J. I. (1968), “The Ultimate Uplift Capacity of Foundation”, Canadian Geotechnical. Journal, Vol.5, No.4, pp.225-244.
10.1139/t68-024
15
O’Neill, M. W. and Reese, L. C. (1999), “Drilled Shafts: Construction Procedures and Design Methods”, Publication No. FHWA-IF-99-025, Federal Highway Administration (FHWA).
16
Reese, L. C. and O’Neill, M. W. (1988), Drilled Shafts: Construction and Design, Publication No. HI-88-042, Federal Highway Administration (FHWA).
17
Schanz, T., Verrmeer, P. A., and Bonnier, P. G. (1999), “The Hardening Soil Model: Formulation and Verification”, Beyond 2000 in computational geotechnics, Balkema, Rotterdam, pp.1-16.
18
Yoon, M. S., Lee, C. K. and Kim, M. H. (2013), “Evaluation of Unit Side Resistance of Drilled Shafts by Revised SPT N Value”, Journal of the Korean geotechnical society, Vol.29, No.12, pp.5-10. (in Korean with English summary)(in Korean with English summary)
10.7843/kgs.2013.29.12.5
19
You, S. K., Hong, G., Jeong, M., Shin, H., Lee, K. W. and Ryu, J. (2018), “Effect of Relative Density and Fines Content on Pullout Resistance Performance of Drilled Shafts”, Journal of the Korean Geotechnical Society, Vol.34, No.4, pp.37-47. (in Korean with English summary)
20
You, S. K., Shin, H., Lee, K. W., Park, J. J., Choi, C. L. and Hong, G. (2019), “Evaluation on applicability of finite element analysis in model test of pile pullout”, Journal of the Korean Geosynthetics Society, Vol.18, No.2, Accepted. (in Korean with English summary)
Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 18
  • No :2
  • Pages :45-54
  • Received Date : 2019-06-07
  • Revised Date : 2019-06-19
  • Accepted Date : 2019-06-22
  • DOI :https://doi.org/10.12814/jkgss.2019.18.2.045
Journal Informaiton Journal of the Korean Geosynthetics Society Journal of the Korean Geosynthetics Society
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close