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지반앵커에 대한 인장시험 성능평가 기준선의 적용성 고찰

Applicability of the Tensile Test Performance Evaluation Baseline for Ground Anchors

  • 김대근 (한국해양대학교 토목환경공학과) ;
  • 박태광 (한국해양대학교 토목환경공학과) ;
  • 박이근 ((주)지오알앤디) ;
  • 김태형 (한국해양대학교 건설공학전공)
  • Kim, Dae Gun (Dept. of Civil and Environmental Engrg., Korea Maritime and Ocean Univ.) ;
  • Park, Tae Kwang (Dept. of Civil and Environmental Engrg., Korea Maritime and Ocean Univ.) ;
  • Park, Lee Keun (Geotechnical Research & Development Co.) ;
  • Kim, Tae-Hyung (Dept. of Civil Engrg., Korea Maritime and Ocean Univ.)
  • 투고 : 2022.07.14
  • 심사 : 2022.08.04
  • 발행 : 2022.08.31

초록

현재 인장형 지반앵커는 그 사용목적, 사용기간에 따라 가설과 영구로 구분하여 성능평가를 별도로 제시하고 있다. 현재의 성능평가 상한선과 하한선 기준을 실무에 적용하는 데 있어 타당한 것으로 보인다. 하지만, 압축형 지반앵커는 주로 영구로 사용되어 온 점으로 인해 가설과 영구의 구분 없이 영구에 해당하는 기준이 제시되어 있어 제거형과 같이 가설로 사용하는 지반앵커에 있어서는 엄격한 기준이 되고 있다. 기존 성능평가 기준선을 고찰해 본 결과, 하한 기준선은 가설과 영구 구분 없이 적용할 수 있는 것으로 판단되나 상한 기준선은 가설과 영구를 구분하여 제시하는 것이 바람직한 것으로 판단된다. 압축형 지반앵커에서 상한선 기준의 적용에 있어서 앵커의 정착지반상태(암반 또는 토사), 사용기간, 특히 하중-변위 곡선의 탄성상태 유지 여부 등을 고려하여 상한선을 조정할 필요성이 있다.

Currently, tension ground anchors are divided into temporary and permanent based on their purpose and period of use, and their performance evaluations are presented separately. Therefore, applying the current performance evaluation's upper and lower limits to practice seems reasonable. However, because compression ground anchors have been mainly used as permanent, performance evaluation corresponding to permanent is conducted without distinction between temporary and permanent. This evaluation is a strict standard for ground anchors used as temporary, including the removal type. Because of examining the existing performance evaluation for the compression ground anchor, the lower limit can be applied without distinguishing between the temporary and permanent. However, the upper limit should be presented separately for the temporary and permanent. In applying the upper limit, it is necessary to adjust the upper limit of the anchor considering the anchored ground condition (rock or soil), the period of use, and particularly whether the load-displacement curve maintains the elastic state.

키워드

참고문헌

  1. AASHTO (1990), Permanent ground anchor specification in-situ soil improvement technique, AASHTO-AGC-ARTBA TF27.
  2. British Standards Institution (1989), British Standard Code of Practice for Ground anchorages, BS 8081.
  3. Civil Engineering Department Hong Kong (1997), Model specification for Prestressed Ground Anchors, Geotechnical Control Office, GEOSPEC1.
  4. Deutshe Industrie Normen (1990), Ground Anchorages Design, Construction and Testing, DIN-4125.
  5. European Committee for Standardization (2009), EUROCODE 7 Execution of special geotechnical work - Ground Anchors, EN 1537.
  6. Ground Anchor Technology Association (1997), Design.Construction Guideline for Ground Anchor, Science technology, pp.258-282.
  7. Hayashi, T. (1989), Study on the pulling resistance mechanism of the ground anchor of the sandy ground, Ph.D. dissertation at the University of Tokyo, Japan.
  8. Kim, J.H. and Jung, H.S. (2016), "Ground Anchor Method for Practitioners".
  9. Korea Expressway Corporation (2016), A survey on the application actual condition and establishment of performance improvement countermeasure of permanent anchor for ground reinforcement (In Korean).
  10. Lee, S.D. (1997), Soil Testing - Principles and Methods, Kyobobook.
  11. Ministry of Land, Transport and Maritime Affairs (2011a), Man-made slope design standard.
  12. Ministry of Land, Transport and Maritime Affairs (2011b), Man-made slope construction specification.
  13. Ministry of Land, Infrastructure and Transport (2020a), Korean Design Standards (KDS) 11 60 00 : Ground anchor.
  14. Ministry of Land, Infrastructure and Transport (2020b), Korean Construction Specification (KCS) 11 60 00 : Ground Anchor.
  15. Park, K.D., Yoon, D.W., Heo, I.-Y., Lee, J.G., and Chang, B.S. (2014), "Standard Method Research on the Anchor Pullout Test", Proceedings of Korea Institute for Structural Maintenance Inspection spring conference, Vol.18, No.1, pp.206-209.
  16. Park, S.Y., Lee, S.R., Jung, J.H., and Cho, W.J. (2020), "Evaluation of Residual Tensile Load of Field Ground Anchors based on Long-term Measurement", J. of the Korean Geotechnical Society, Vol.36, No.8, pp.35-47. https://doi.org/10.7843/KGS.2020.36.8.35
  17. Park, S.-Y., Hwang, B.S., Lee, S.R., and Cho, W.J. (2021), "Prediction of Long-term behavior of Ground Anchor based on the Field Monitoring Load Data Analysis", J. of the Korean Geotechnical Society, Vol.37, No.8, pp.25-35. https://doi.org/10.7843/KGS.2021.37.8.25
  18. Song, M.K., Park, S.Y., Lee, S.R., and Cho, W.J. (2019), "Improvement of Lift-off Tests via Field Evaluation of Residual Load in Ground Anchor", J. of The Korean Geotechnical Society, Vol.35, No.5, pp.43-51. https://doi.org/10.7843/KGS.2019.35.5.43
  19. Sabatini, P.J., Pass, D.G., and Bachus, R.C. (1999), GEOTECHNICAL ENGINEERING CIRCULAR NO. 4, Ground Anchors and Anchored Systems, Report No. FHWA-IF-99-015, pp.281.
  20. The Japanese Geotechnical Society (1990), Ground Anchor Design and Construction Standards, Commetary.