Browse > Article
http://dx.doi.org/10.12814/jkgss.2014.13.2.031

Effect of Configuration of Shaft and Helix Plate on Bearing Capacity of Moderate-size Helical Pile : I. Test-bed Construction and Field Loading Test  

Lee, Jongwon (School of Civil, Environmental and Architectural Engineering, Korea Univ.)
Lee, Dongseop (School of Civil, Environmental and Architectural Engineering, Korea Univ.)
Kim, Hyung-Nam (Sambo Geotechnical Engineering Co, Ltd.)
Choi, Hangseok (School of Civil, Environmental and Architectural Engineering, Korea Univ.)
Publication Information
Journal of the Korean Geosynthetics Society / v.13, no.2, 2014 , pp. 31-39 More about this Journal
Abstract
The helical pile is a manufactured steel pile consisting of one or more helix-shaped bearing plates affixed to a central shaft. This pile is installed by rotating the shaft into the ground to support structural loads. The advantages of helical piles are no need for boring or grout process, and ability to install with relatively light devices. The bearing capacity of the helical pile is exerted by integrating the bearing capacity of each helix plate attached to the steel shaft. In this paper, to estimate the bearing capacity of moderate-size helical piles, 6 types of helical piles were constructed with different shaft diameter, plate configuration and the penetration depth. A series of field loading tests was performed to evaluate the effect of helical pile configuration on the bearing capacity of helical pile, constructed in two different shaft diameters (i.e. 73 mm and 114 mm). In the same way, the diameter of bearing plate was also changed from 400mm to 250mm with one or three plates. As well, the penetration depth was varied from 3m to 6m to analyze the relation between the penetration depth and the bearing capacity. As a result, not only the increase of the shaft diameter, but also the number or diameter of helix bearing plates enhances the bearing capacity. Especially the configuration of the helix plate is more critical than the shaft diameter.
Keywords
Helical pile; helix plate; shaft; bearing capacity;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Meyerhof, G. G. (1951), "The Ultimate Bearing Capacity of Foundations." Geotechnique, Vol.2, No.4, pp.301-331.   DOI
2 Perko, H. A. (2009), Helical Pile, John Wiley & Sons, Inc., Hobojen, New Jersey, p.5.
3 Terzaghi, K. (1943), Theoretical Soil Mechanics, New York: John Wiley and Sons.
4 Watson, T. B. (2011), Fundamentals of helical anchors/piles, pp.5-7.
5 Yoo, C. S. (2012), "Effect of Screw Geometries on Pull-out Characteristics of Screw Anchor Piles Using Reduced Scale Model Tests", Korean Geotechnical Society, Vol. 28 No.1, pp.5-15.   과학기술학회마을   DOI   ScienceOn
6 Deardorff, D. (2007), "Torque Correlation Factors for Round Shaft Helical Piles". In Proceedings of the 32nd Annual Conference of the Deep Foundation Institute, Colorado Springs, CO, pp.439-450.
7 Ha, T. S., Moon, H. R. and Moon, H. M. (2013), "An analysis of correlation between predicted and measured bearing capacity in Rotary(Helical) pile method", Korean Geotechnical Society Conference.
8 Lee, J., Lee, D., Na, K. and Choi, H. (2014), "Effect of configuration of shaft and helix plate on bearing capacity of moderate-size helical pile : II. Bearing capacity prediction", Journal of the Korean Geosynthetics Society, under review.
9 Livneh, B. and Naggar, M. H. (2008), "Axial testing and numerical modeling of square shaft helical piles under compressive and tensile loading", Canadian Geotechnical Journal, Vol. 45, Issue 8, pp.1142-1155.   DOI   ScienceOn
10 Merifield, R. S. (2011), "Ultimate Uplift Capacity of Multiplate Helical Type Anchors in Clay", Journal of Geotechnical and Geoenvironmental Engineering ASCE, July 2011, Vol. 137, No.7, pp.704-716.   DOI   ScienceOn