Browse > Article
http://dx.doi.org/10.7843/kgs.2015.31.8.39

Evaluation of Axial Bearing Capacity of Waveform Micropile by Centrifuge Test  

Jang, Young-Eun (Dept. of Geospace Engrg., Univ. of Science & Technology)
Han, Jin-Tae (Dept. of Geotechnical Engrg., Korea Institute of Civil Engrg. and Building Technology, UST)
Kim, Jae-Hyun (Dept. of Civil and Environmental Engrg., KAIST)
Park, Heon-Joon (Dept. of Civil and Environmental Engrg., KAIST)
Kim, Sang-Hwan (Dept. of Civil Engrg., Hoseo Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.31, no.8, 2015 , pp. 39-49 More about this Journal
Abstract
In this study, a series of centrifuge tests were performed in order to observe the bearing capacity of waveform micropile, a new concept of micropile that uses a modified jet grouting process. A total of six models were considered, conventional micropile, jet grouted pile, and four different shapes of waveform micropiles. The test results indicated that the waveform micropile effectively contributes to the increase of the bearing capacity compared to the micropile without the shear keys. Among the waveform micropiles, the model that has a relatively small space between the shear keys showed the most significant improvement of load capacity. Additionally, the ultimate load capacities of all piles were compared using well-known estimation method. As a result, P-S curve method and total settlement method with 25.4 mm were considered suitable to account ultimate load for the waveform micropile.
Keywords
Micropile; Waveform micropile; Jet grouting method; Pile load test; Pile load capacity;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Balign, F. A. and Abdelrahman, G. E. (2005), "Modification of Davisson's Method", Proc. of the International Conference on Soil Mechanics & Geotechnical Engineering. Vol.16, No.4, pp.2079-2082.
2 Davisson, M. T. (1972), "High Capacity Piles. Proceedings, Lecture Series, Innovations in Foundation Construction", ASCE, Illinois Section, Chicago, pp.81-112.
3 FHWA (2005), Micropile Design and Construction: Reference Manual, FHWA-NHI-05-039, Federal Highway Administration, Vol.1, No.1, pp.7-28.
4 Finno, R. J. (2002), "Evaluation of Capacity of Micropiles Embedded in Dolomite:, Final Rep. of Infrastructure Technology Institute, Northwestern Univ., Evanston, IL.
5 Gomez. J., Cadden, A., and Bruce, D. A. (2003), "Micropiles Founded in Rock: Development and Evolution of Bond Stresses under Repeated Loading", Proc. of the 12th Pan-American Conferemce on Soil Mechanics and Geotechnical Engineering (Soil Rock America 2003), VGE, Essen, Germany, pp.1911-1916.
6 Han, J. T., Kim, S. R., Jang. Y. E., and Lee, S. H. (2013), "Evaluation of Bearing Capacity of Waveform Micropile by Numerical Analyses", Journal of the Korea Academia-Industrial cooperation Society, Vol.14, No.11, pp.5906-5914.   DOI   ScienceOn
7 Jaritngam, S. (2003), "Design Concept of Soil Improvement for Road Construction on Soft Clay", In Proceedings of the eastern Asia society for transportation studies, Vol.4, pp.311-322.
8 Juran, I., Benslimane, A., and Hanna, S. (2001), Engineering analysis of dynamic behavior of micropile systems, Transportation Research Record No. 1772: Soil Mechanics, pp.91-106.
9 Kim, D. S., Kim, N. R., Choo, Y. W., and Cho, G. C. (2013), "A Newly Developed State-of-the-art Geotechnical Centrifuge in Korea", Journal of Korean Society of Civil Engineering, Vol.17, No.1, pp.77-84.
10 Lee, J. M. and Kim, D. H. (2014), "A Bearing Capacity of Micropile with Expanded Drill Hole", Journal of Korean Society of Hazard Mitigation, Vol.14, No.4, pp.127-133.   DOI
11 Sadek, M. and Isam, S. (2004), "Three-dimensional Finite Element Analysis of the Seismic behavior of Inclined Micropiles", Soil Dynamics and Earthquake Engineering, Vol.24, No.6, pp.473-485.   DOI   ScienceOn
12 Seo, H., Prezzi, M., and Salgado, R. (2013), "Instrumented Static Load Test on Rock-Socketed Micropile", Journal of Geotechnical and Geoenvironmental Engineering, Vol.139, No.12, pp.2037-2047.   DOI
13 Terzaghi, K. and Peck, R. B. (1967), Soil Mechanics in Engineering Practice, 2nd ed, John Wiley and Sons, New York, pp.346-352.
14 Tornaghi, R. and Cippo, A. P. (1985), "Soil Improvement by Jet Grouting for the Solution of Tunnelling Problems", Proc. of the 4th International Symposium Tunnelling. Vol.85, pp.1-10.
15 Touma, F. T. and Reese, L. C. (1974), "Behavior of Bored Piles in Sand", Journal Geotechnical Engineering Division, ASCE, Vol.100, No.7, pp.749-761.
16 Tsukada, K., Miura, Y., Tsubokawa, Y., and Otani., G. L. (2006), "Mechanism of Bearing Capacity of Spread Footings Reinforced with Micropiles", Journal of soils and foundations, Vol.46, No.3, pp.367-376.   DOI