DOI QR코드

DOI QR Code

Pullout Characteristics of Geogrid with Attached Passive Reinforcement

마찰돌기를 부착한 지오그리드의 인발특성 평가

  • Moon, Hongduk (Department of Civil Engineering, Gyeongnam National University of Science and Technology) ;
  • Yoo, Chulho (Daepyung C&C)
  • Received : 2014.07.28
  • Accepted : 2014.09.14
  • Published : 2014.11.01

Abstract

In this study, a series of pullout experiments were conducted on geogrid with attached passive reinforcement with respect to silt containments. Experiments were performed on man-made sand ground containing different silt of 0 %, 17 %, 35 % under various normal stresses 30 kPa, 60 kPa, 120 kPa respectively. The pullout test results showed that passive reinforcement increased the pullout strength over all silt contained condition and showed up to 20 % increases for same soil condition. The test results converted to the coefficient of interaction of pullout test to investigate the effect of reinforcement and the case of passive reinforcement showed 0.7~1.6 distribution depend on a silt contents. Therefore it is concluded that the overall length of geogrid can be reduced under the low vertical stress conditions.

본 연구에서는 실트함유율과 상재하중에 따른 보강재(지오그리드)의 인발저항력의 변화를 알아보기 위하여 실트함유율이 각각 0 %, 17 %, 35 %, 수직하중이 각각 30 kPa, 60 kPa, 120 kPa인 형태로 그리드를 무보강과 마찰돌기 형태로 변화를 주어 인발시험을 시행하였다. 인발시험결과 일반 지오그리드의 경우 실트함유율이 증가하면 인발저항력이 감소되지만 마찰돌기를 부착한 그리드의 경우는 동일조건에서 약 20 %의 증가를 보이는 것으로 확인되었고, 상호작용계수는 실트함유량에 따라 0.7~1.6의 분포를 보였다. 이러한 결과를 바탕으로 낮은 수직하중상태에서 보강토옹벽의 설계 시 마찰돌기 부착형 보강재는 뒷채움재료 특성에 따라 사용 길이를 감소시킬 수 있을 것으로 평가되었다.

Keywords

References

  1. Cho, S. D. and Kim, J. M. (1996), Evaluation of friction characteristics and pullout test of weathered granite soil/geogrid, Journal of The Korean Geotechnical Society, Vol. 12, No. 4, pp. 87-99 (in Korean).
  2. FHWA (2001), Federal highway administration, NHI-00-043, Washington, D.C. USA. pp. 1-50.
  3. Jewell, R. A. (1990), Revised design charts for reinforced slopes, Proceedings of Symposium on Reinforced Embankment; Theory and Practice in the British Isles, Cambridge, September, Thomas Telford, pp. 1-27.
  4. Kim, S. K. and Lee, E. S. (1996), Coefficient of apparent friction of strip reinforcement for weathered granite soil, Journal of The Korean Geotechnical Society Vol. 12, No. 5, pp. 137-151 (in Korean).