Numerical Analysis for Optimal Reinforcement Length Ratio According to Width-to-Height Ratio of Back-to-Back MSE

Choon-Sik Park; Dong-Kwang Kim

doi:10.7843/kgs.2020.36.12.69

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2020 Vol.36, Issue 12 Preview Page Next Page

Research Article

Numerical Analysis for Optimal Reinforcement Length Ratio According to Width-to-Height Ratio of Back-to-Back MSE Back-to-Back 보강토옹벽의 옹벽폭비에 따른 최적 보강길이비 산정을 위한 수치해석적 연구

31 December 2020. pp. 69-76

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Abstract

Since the mechanically stabilized earth walls have a form of retaining wall compatible with a narrow section, the geogrid overlaps according to the separation distance between the walls. There is a problem that the overall behavior may occur in the state of being integrated with the stress change due to the interaction of the geogrid. Therefore, a careful approach is required at the design stage, but there are currently no design criteria or guidelines in Korea. This study investigated the optimal reinforcement length ratio according to the retaining wall width to height ratio (width to height ratio, W_b/H) for these back-to-back mechanically stabilized earth walls. Retaining wall width ratio is 1.1H, 1.4H, 1.7H, 2.0H for Case II of the FHWA design standard, and the height is 3.0 m, 5.0 m, 7.0 m, and 10.0 m, which are most commonly applied. Through numerical analysis, the appropriateness of the FHWA design standard and the optimal reinforcement length ratio according to the height of the retaining wall and the width of the retaining wall were proposed.

Keywords

Back-to-Back mechanically stabilized earth walls

Reinforcement length ratio

Width-to-Height ratio

Back-to-Back 보강토옹벽은 좁은 구간에 양립하는 옹벽의 형식을 가지기 때문에 벽체간의 이격거리에 따라 보강재가 겹치게 되어 보강재 간의 상호작용에 의한 응력 변화와 일체화된 상태에서 전체가 거동하는 문제 등으로 설계단계에서 신중한 접근이 필요하나 현재 국내에 정형화된 설계기준이나 지침이 전무한 상태이다. 본 연구는 이러한 Back-to-Back 보강토옹벽에 대해 옹벽폭 대 높이비(옹벽폭비, W_b/H)에 따른 최적 보강길이비에 대해 고찰하였다. 옹벽폭비는 FHWA 설계기준의 Case II에 해당하는 1.1H, 1.4H, 1.7H, 2.0H, 높이는 일반적으로 가장 많이 적용되고 있는 3.0m, 5.0m, 7.0m, 10.0m를 대상으로 하였으며, 각 조건에서 수치해석을 통해 FHWA 설계기준의 적정성과 옹벽의 높이 및 옹벽폭비에 따른 최적 보강길이비를 제안하였다.

References

Ryan R. Berg, Barry R. Christopher, and Naresh C. Samtani (2009), "Design of Mechanically Stabilized Earth Walls and Reinforced Soil Slopes-Volume I", FHWA-NHI-10-024 FHWA GEC 011-Vol I, pp.6-17~6-19.

FHWA (1997), Desigen manual for segmental retaining walls 2nd Ed., NCMA, Virginia.

Kim, S. B. and Yoo, C. S. (2008), "Load Carrying Capacity of Back-to-Back Reinforced Soil Walls", Journal of The Korean Geotechnical Society, Vol.24, No.12, pp.41-52 (In Korean).

Koerner, R.M. (2005), Designing with Geosynthetics Fifth Edition, Pearson Education, Inc., pp.41-44.

Naïma Benmebarek, Sadok Benmebarek, Samir Attallaoui (2016), "Interaction Analysis of Back-to-back Mechanically Stabilized Earth Walls", Journal of Rock Mechanics and Geotechnical Engineering, 8(2016), pp.697-702. 10.1016/j.jrmge.2016.05.005

NCMA (1997), Design Manual for Segmental Retaining Walls, National Concrete Masonry Association, Virginia, U.S.A.

Mohamed Djabri, Sadok Benmebarek (2016), "FEM Analysis of Back-to-Back Geosynthetic Reinforced Soil Retaining Walls", Int. J. of Geosynth and Ground Eng(2016) 2:26, DOI 10.1007/s40891-016-0067-1. 10.1007/s40891-016-0067-1

Yoo, C. S., Woo, S. J., Jeon, H. M., and Shin, B. N. (2011), "Investigation on Failure Mechanism of Back-to-Back Geosynthethic Reinforced Wall Using Discrete Element Analysis", Journal of The Korean Geosynthetics Society, Vol.10, No.2, June. 2011, pp.55-66 (In Korean).

Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 36
No :12
Pages :69-76
Received Date : 2020-11-24
Revised Date : 2020-12-22
Accepted Date : 2020-12-22
DOI :https://doi.org/10.7843/kgs.2020.36.12.69

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

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