Fig. 1. Process flow chart
Fig. 2. Section S1 (Facing slope=1:0.05)
Fig. 3. Section S2 (Facing slope=1:0.2)
Fig. 4. Section S3 (Facing slope=1:0.3)
Fig. 5. Optimum geotextile combination of facing slope S1
Fig. 6. Optimum geotextile combination of facing slope S2
Fig. 7. Optimum geotextile combination of facing slope S3
Fig. 8. Change in safety factor according to reinforcement length ratio (L/H) of S1 (MSEW)
Fig. 9. Change in safety factor according to reinforcement length ratio (L/H) of S1 (SLOPE/W)
Fig. 10. Change in safety factor according to reinforcement length ratio (L/H) of S2 (MSEW)
Fig. 11. Change in safety factor according to reinforcement length ratio (L/H) of S1 (SLOPE/W)
Fig. 12. Change in safety factor according to reinforcement length ratio (L/H) of S2 (MSEW)
Fig. 13. Change in safety factor according to reinforcement length ratio (L/H) of S1 (SLOPE/W)
Fig. 14. Section and condition of superimposed wall
Fig. 15. Strain-tensile strength curve by type of geogrids (Han et al., 2012)
Fig. 16. Calculation overburden load of superimposed wall (NCMA, 1998)
Fig. 17. Change in safety factor according to reinforcement length ratio (L/H) of superimposed wall
Fig. 18. Geosynthetics fracture ratio of PET geogrid
Fig. 19. Optimum geogrid combination (H=6.0m, L=4.2m)
Fig. 20. Optimum geogrid combination (H=7.0m, L=4.6m)
Fig. 21. Optimum geogrid combination (H=8.0m, L=5.2m)
Fig. 22. Optimum geogrid combination (H=9.0m, L=5.9m)
Fig. 23. Optimum geogrid combination (H=10.0m, L=6.2m)
Table 1. Properties of geosynthetics
Table 2. Geosynthetics fracture ratio of facing slope S1
Table 3. Geosynthetics fracture ratio of facing slope S2
Table 4. Geosynthetics fracture ratio of facing slope S3
Table 5. Layout optimum geotextile combination of facing slope S1
Table 6. Layout optimum geotextile combination of facing slope S2
Table 7. Layout optimum geotextile combination of facing slope S3
Table 8. Length/Height (L/H) for optimal design of geosynthetics
Table 9. Design of superimposed MSE wall (FHWA, 1997)
Table 10. Safety factor according to Length/Height ratio (L/H)
Table 11. Length/Height (L/H) for optimal design of superimposed wall
References
- 국토해양부 (2011), 건설공사 비탈면 설계기준, pp. 109-118.
- 국토해양부 (2013), 건설공사 보강토옹벽 설계.시공 및 유지 관리 잠정지침, Ch. I-III.
- 한국도로공사 (2009), 고속도로 건설공사 보강토옹벽 설계기준.
- FHWA (1997), Desigen Manual for Segmental Retaining Walls 2nd Ed., NCMA, Virginia.
- Han, S. H., Yea, G. G. and Lee, K. W. (2012), Tensile strength - strain relationship of various geogrids, Journal of the Korean Geo-Environmental Society, No. 13, Vol. 2, pp. 83-93 (In Korean).
- Koerner, R. M. (2005), Designing with geosynthetics fifth edition, Pearson Education, Inc., pp. 41-44.
- NCMA (1998), Segmental Retaining Walls-Seismic Design Manual, National Concrete Masonry Association, Virginia, U.S.A.