Fig. 1. Classification according to the grouting method
Fig. 2. Model box
Fig. 3. Excavation apparatus
Fig. 4. Pullout apparatus
Fig. 5. View of unconfined compression test of pipe type
Fig. 6. View of unconfined compression test of helical type
Fig. 7. View of unconfined compression test of disk type
Fig. 8. View of unconfined compression test of wing type
Fig. 9. Compressive load between grout and reinforcement bars
Fig. 10. View of unconfined compression test of hole type
Fig. 11. View of unconfined compression test of hole and wing type
Fig. 12. Compressive load with variation of hole type
Fig. 13. Pullout resistance stress according to reinforcement type
Fig. 14. Reinforcement effect according to reinforcement type
Fig. 15. Pullout resistance stress with variation of hole size
Fig. 16. Reinforcement effect according to variation of hole size
Fig. 17. Pullout resistance stress with variation of grouting method
Fig. 18. Pullout resistance stress according to variation of expansion ratio
Fig. 19. Reinforcement effect according to variation of expansion ratio
Table 1. Presumptive average ultimate bond stress for ground/grout interface along bond zone (Sabatini et al., 1999)
Table 2. Characteristics of weathered granite soil
Table 3. Shear strength of weathered granite soil
Table 4. Reinforcement bar
Table 5. Test series
References
- Bruce, D. A. and Juran L. (1997), Drilled and grouted micropiles : State of Pratice Review, FHWA-RD-96-016, Washington, D.C, Vol. II, pp. 8-54.
- Cho, C. H., Heo, Y. and Bae, W. S. (2013), Behavior characteristics of helical pile in granite residual soil, Journal of the korean Geo-Environmental Society, Vol. 14, No. 3, pp. 41-49 (In Korean).
- Korea Infrastructure Safety Corporation (2009), Design criteria for slope, pp. 141-173.
- Lee, B. J., Kim, S. S., Youn, J. S. and Lee, J. K. (2010), Pullout characteristics of reinforcing body using pressure re-injection grouting method, Journal of the Korean Geo-Environmental Society, Vol. 11, No. 10, pp. 25-31 (In Korean).
- Sabatini, P. J., Burak T., Armour, T., Groneck, P. and Keelev, J. (2005), Micropile design and construction (Reference manual for NHI cource 132078), FHWA-NHI-05-039, Washington, D.C, pp. 4-11-4-26.
- Sabatini, P. J., Pas, D. G. and Bachus, R. C. (1999), Geotechnical Engineering Circular No. 4 Ground Anchors and Anchored Systems, FHWA-SA-99-015, Office of Bridge Technology Federal Highway Administration, Washington, D.C, pp. 6-73.
- Shim, Y. J., Lee, J. K. and Lee, B. J. (2012), Pullout characteristics of pressure reinjection-grouted reinforcements in decomposed granite soil, Journal of the korean Geo-Environmental Society, Vol. 13, No. 11, pp. 61-68 (In Korean).
- Shin, E. C., Kim, J. I. and Kim, I. D. (2002), Effect of slenderness ratio and pullout rate on uplift adhesion factor of concrete pile driven in clay, Conference of KSCE, pp. 2090-2093 (In Korean).