Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
권호 표지
DOI QR코드

DOI QR Code

Numerical Study on the Skin Friction Characteristics of Tension Type Ground Anchors in Weathered Soil

풍화토 지반에 적용된 인장형 앵커의 주면마찰응력 분포특성에 대한 수치해석적 연구

  • 정현식 (경기대학교 토목공학과) ;
  • 한광석 (경기대학교 토목공학과) ;
  • 이영생 (경기대학교 토목공학과)
  • Received : 2016.10.10
  • Accepted : 2017.01.10
  • Published : 2017.01.31
Download PDF
⟨ Previous Next ⟩

Abstract

Distribution of both axial force and skin friction should be investigated in order to estimate pull-out capacity of ground anchors. Numerical method of computing load-transfer characteristics of the ground anchors, however, has not been specified and studies on this area are not sufficient. This study suggested the numerical method of simulating the characteristics of axial force and skin friction distribution against the tension type ground anchors. Also, debonding behaviors of skin friction and axial force were calculated by the suggested numerical method as a function of load levels. As a result of the review, it is confirmed that the distributions of axial force and skin friction by the suggested numerical method are relatively similar to those of field test results.

지반앵커의 인발능력을 평가하기 위해서는 앵커 정착장에 작용하는 축력 및 마찰응력 분포특성을 검토해야 한다. 그러나 지반앵커의 하중전이특성에 대한 해석적 방법은 현재 기준화되지 않았으며 또한 이와 관련된 연구도 부족한 실정이다. 따라서 본 논문에서는 마찰(인장)형 지반앵커를 대상으로 풍화토 지반조건에서 작용하중별 정착장에 작용하는 축력 분포와 주면마찰응력분포 특성을 모사할 수 있는 해석적 방법을 검토하였으며, 본 해석적 방법을 통해 주면마찰응력의 진행적 변화거동 특성을 분석하였다. 검토결과 제안된 해석적 방법에 의한 정착장 축력 및 주면마찰응력 분포가 현장실험결과와 비교적 유사함을 확인하였다.

Keywords

References

  1. AASHTO LRFD Bridge Design Specifications (2012), pp.5-19-5-26.
  2. B.S 8081 (1989), "British Standards Code of Practice for Ground Anchorages", British Standards Institution, pp.19-31, 34-39.
  3. Budhu, M. (2011), "Soil Mechanics and Foundation", pp.723-729
  4. Civil Engineering Services Department Hong Kong (1989), "Model Specification for Prestressed Ground Anchors", pp.51-65.
  5. Coates, D. F. and Yu, Y. S. (1970), "Three Dimensional Stress Distributions Around a Cylindrical Hole and Anchor", Proc. 2nd Int. Conf. on Rock Mech., Belgrade, pp.175-182.
  6. DIN 4125 (1990), "Ground Anchorages-Design, Construction and testing", German Institute for Standardization, pp.19-31, 34-39.
  7. Federal Highway Administration Ground (1999), "Anchor and Anchored Systems", pp.4-10, 46-77.
  8. GEO-SLOPE International Ltd (2007), "SIGMA/W Engineering Manual", pp.107-152.
  9. Hong, S. W. (2002), "The Study on Pullout Resistance Characteristic of the Compresssion Anchor by Pullout Test on the Field", Journal of Advanced Research in Ocean Engineering, Vol.16, No.2, pp. 44-52.
  10. Hong, W. P., Yun, J. M., and Song, Y. S. (2004), "Lateral Earth Pressure acting on Anchored Retention Walls installed in Cut Slope", Journal of the Korean Society of Civil Engineers, Vol.24, No.2C, pp.125-133.
  11. Ivering, J. W. (1981), "Development in the Concept of Compression Tube Anchors", Ground Eng., Vol.14, pp.31-34.
  12. Kim, J. H. and Jeong, H. S. (2014), "Characteristics of Multi Load Transfer Ground Anchor System", Journal of Korean Tunnelling and Underground Space Association, Vol.16, No.01, pp.25-50. https://doi.org/10.9711/KTAJ.2014.16.1.025
  13. Kim, J. H. and Jeong, H. S. (2016), "Ground Anchor Technique for Executives", first edition, CIR, pp.17-52.
  14. Kim, N. K. (2001), "Load Transfer of Tension and Compression Anchors in Weathered Soil", Journal of the Korean Geotechnical Society, Vol.17, No.3, pp.59-68.
  15. Kim, Y. M., Cho, K. W., Kim, W. K., and Kim, H. M. (2004), "Load Distribution and Pullout Capacity of Compression Anchors", Journal of the Korean Society of Civil Engineers, pp.4219-4224.
  16. Lee, J. U. (2014), "Effect of Multi-Compression Type Anchor with the Installation Space of Compression Tube", Ph D Thesis, Daejin University, pp.75-85.
  17. Liao, H., Ou, C., and Shu, S. (1996), "Anchorage Behavior of Shaft Anchors in Alluvial Soil", J. Geotech. Engrg., Vol.122, Issue 7, pp.526-533. https://doi.org/10.1061/(ASCE)0733-9410(1996)122:7(526)
  18. Littlejohn, G. S. (1980), "Design Estimation of Ultimate Load Holding Capacity of Ground Anchors", Ground Engineering, England, pp.25-39.
  19. Ostermayer, H. (1974), "Construction, Carrying Behavior and Creep Characteristics of Ground Anchors", ICE Conf. on Diaphargm Walls and Anchorages, London, pp.141-151.
  20. Ostermayer, H. and Scheele, H. (1977), "Research on Ground Anchors in Non-Cohesive Soils", Revue Francaise de Geotechnique, Vol.3, pp.92-97.
  21. Post-Tensioning Institute (2004), "Recommendations for Prestressed Rock and Soil Anchors", pp.11-20, 35-50.
  22. Sung, H. J. (2012), "Tension Force Monitoring of Ground Anchor Using Fiber Optic Sensors Embedded Tendon", Ph D Thesis, Chonnam National University, pp.69-144.
  23. Sung, H. J., Kim, Y. S., Kim, J. M., and Park, G. H. (2011), "Tension Force Monitoring of Tension Type Ground Anchor Using Optical FBG Sensors", Journal of the Korean Geotechnical Society, Vol.27, No.6, pp.17-26. https://doi.org/10.7843/kgs.2011.27.6.017
  24. Swiss Society of Engineers and Architects (1977), "SIA. Edition Ground Anchors", pp.28-37.
  25. Thorburn, S. and Littlejohn, G. S. (1993), "Underpinning and Retention", Champman & Hall, pp.304-310.
  26. Weerasinghe, R. B. and Littlejohn, G. S. (1997), "Load Transfer and Failure of Anchorages in Weak Mudstone", Ground Anchorages and Anchorages Structures, Thomas Telford ltd, London, pp.34-44
  27. Woods, R.I. and Barkhordari, K. (1997), "The Influence of Bond Stress Distribution on Ground Anchor Design", Proc. of Int. Conf. Ground Anchorages and Anchorages Structures. London, pp.55-64.
  28. Xanthakos, P. P. (1991), "Ground Anchors and Anchored Structures", A Wiley-Interscience Publication, pp.71-75, 105-106, 142-150.