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Evaluation of the Behavioral Characteristics of Soil Nail Using High-strength Steel Pipe through Field Test

현장시험을 통한 고강도 강관을 이용한 쏘일네일의 거동특성 평가

  • Park, Jeaman (Department of Civil and Environmental Engineering, Hanyang University) ;
  • Park, Duhee (Department of Civil and Environmental Engineering, Hanyang University) ;
  • Lee, Jongkwon (HANKOOK Material Corporation) ;
  • Jung, Kyoungsik (S-TECH Consulting Group Corporation)
  • Received : 2020.09.24
  • Accepted : 2021.01.21
  • Published : 2021.02.01

Abstract

In this study, as the production of high-strength steel pipes due to the development of steel materials, the stability and applicability of the soil nailing method using high-strength steel pipes were evaluated. Rebars used as reinforcement in the soil nailing method are the same in order to determine the behavioral characteristics and the effect of increasing the reinforcement when replacing it with a high-strength steel pipe of a diameter, a field test were conducted to confirm the stability. As a result of the tensile test, the measured strain is smaller than the strain in the theoretical equation, so it can be seen that the behavior is similar to that of the soil nailing method using rebars. As a result of the displacement measurement, the displacement of the high-strength steel pipe is larger than that of the rebars is considered to be the effect of the internal grouting effect of the steel pipe and the decrease in the cross-sectional area. In the case of using high-strength steel pipes for the soil nailing method, it is judged that the field applicability is good by improving stability and workability through member performance and weight reduction.

본 연구에서는 최근 강소재의 발전에 의해 고강도 강관의 제작이 실용화됨에 따라 고강도 강관 쏘일네일링 공법의 안정성 및 적용성에 대한 평가를 수행하였다. 쏘일네일링 공법에서 보강재로 사용되고 있는 이형철근을 동일직경의 고강도 강관으로 대체할 때의 보강재의 거동특성과 보강력 증대효과를 규명하고 안정성을 확인하기 위하여 현장시험시공을 실시하였다. 인장시험결과 측정변형률 값이 이론식에서 산정된 변형률보다 작은 값을 보이므로 이형철근을 사용한 쏘일네일링 공법과 유사한 거동을 한다고 볼 수 있다. 변위측정 결과, 고강도 강관의 변위가 이형철근 보다 큰 값을 보이는 것은 강관 내부그라우팅 영향과 단면적 감소에 따른 영향인 것으로 판단된다. 쏘일네일링 공법에 고강도 강관을 사용하는 경우 부재성능 및 경량화를 통하여 안정성 및 시공성 향상에 따른 현장적용성이 양호한 것으로 판단된다.

Keywords

References

  1. 국토교통부 (2016), 건설공사 비탈면 설계기준, pp. 41-45.
  2. 국토교통부 (2016), 건설공사 비탈면 표준시방서, pp. 71-77.
  3. 김홍택 (2001), 쏘일네일링의 원리 및 지침, 평문각.
  4. Kwon, K. K. and Choi, B. H. (2009), Field pull-out test and 3-D FEM analysis fot steel pipe nailing installed foldable wedge, Journal of The Korean Society of Civil Engineers, Vol. 29, No. 6, pp. 313-319 (In Korean).
  5. Kwon, Y. K. and Jeong, S. S. (2009), The effect of shear resistance in rigid soil-nailed slope system, Journal of The Korean Society of Civil Engineers, Vol. 29, No. 6C, pp. 295-301 (In Korean).
  6. Park, S. S. (2003), Stability analysis and application of the pretensioned soil nailing systems, ph D. dissertation, Hongik University, pp. 9-18 (In Korean).
  7. Choi, D. N. (2007), Analysis of reinforcement mechanism of pressure-type steel pipe nailing, Ph D. dissertation, Chungnam National University, pp. 6 (In Korean).
  8. Deguillaume, J. (1981), Influence du dimensionnement et des modes de sollicitations sur la capacite des tirants d'ancrage dans un sable fin, These de Docteur Ingenieur de l'Universite Pierre et Marie Cure, Paris 6 eme, pp. 23-26.
  9. FHWA (1993), Recommandations CLOUTERRE 1991 (English Translation), Publication NO. FHWA-SA-93-026, pp. 34-69.
  10. Plumelle, C. and Schlosser, F. (1990), A french national research projecton soil nailing : clouterre, performance of reinforced soil structures, pp. 219-223.