Browse > Article
http://dx.doi.org/10.9720/kseg.2014.2.261

A Study for the Applicable Bearing-Resistance of Bearing Anchor in the Enlarged-Borehole  

Min, Kyoung-Nam (Department of Geotechnical, Sejong E&C)
Lee, Jae-Won (Department of Geotechnical, Sejong E&C)
Lee, Jung-Gwan (Department of Geotechnical, Sejong E&C)
Jung, Chan-Muk (College of Railroad and Transportation, Woosong University)
Publication Information
The Journal of Engineering Geology / v.24, no.2, 2014 , pp. 261-271 More about this Journal
Abstract
An almost permanent anchor (friction type) is resistant to ground deformation due to the friction between the soil and grout at a fixed length from the anchor body. The purpose of this study is to calculate the force of bearing resistance for a bearing anchor in enlarged boreholes. We conducted analytical and numerical analyses, along with laboratory testing, to find the quantities of bearing resistance prior to grouting in EBA (Enlarged Bearing Anchor) construction. The force of bearing resistance from the analytical method was defined as a function of general borehole diameter, expanded borehole diameter, and soil unconfined compressive strength. We also employed the Flac 3D finite difference numerical modeling code to analyze the bearing resistance of the soil conditions. We then created a laboratory experimental model to measure bearing resistance and carried out a pull-out test. The results of these three analyses are presented here, and a regression analysis was performed between bearing resistance and uniaxial compression strength. The laboratory results yield the strongest bearing resistance, with reinforcement 28.5 times greater than the uniaxial compression strength; the analytical and numerical analyses yielded values of 13.3 and 9.9, respectively. This results means that bearing resistance of laboratory test appears to be affected by skin friction resistance. To improve the reliability of these results, a comparison field study is needed to verify which results (analytical, numerical, or laboratory) best represent field observations.
Keywords
permanent anchor; enlagred borehole; bearing resistance; bearing anchor;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
연도 인용수 순위
1 Alexsander, W. A., 1989, Post ground anchor and method. U.S. Patent No 4,803,812.
2 Kim, N. K., Joo, Y. S., Kim, S. J., Kim, S. K., and Seo, H. K., 2009, Expansion ratio and ultimate load of pulse-discharge bulbed anchors, Journal of the Korean Geotechnical Society, 25(7), 5-10 (in Korean with English abstract).   과학기술학회마을
3 Kim, T. S., Sim, B. K., Lee, S. K., and Lee, I. M., 2010, The effect of pressurized grouting on pullout resistance and the group effect of compression ground anchor, Journal of the Korean Geotechnical Society, 26(6), 5-19 (in Korean with English abstract).   과학기술학회마을
4 Lee, B. J., Kim, J. S., and Lee, J. K., 2012, The pullout characteristics of MC anchor in shale layer, Journal of the Korean Geo-environmental Society, 13(1), 53-61 (in Korean with English abstract).
5 Min, K. N., Ahn, K. K., Lee, J. B., Park, H. J., Lee, J. W., and Lee, J. G., 2010, The applicability evaluation on the ground type anchor with field test, KSEG Conference, November, 59-63 (in Korean).
6 Niroumand, H. and Kassim, K. A., 2010, Analytical and numerical study of horizontal anchor plates in cohesionless soils, Electronic Journal of Geotechnical Engineering, 15, 1-12.
7 Ostermayer. H., 1975, Construction, carrying behavior and creep characteristics of ground anchors, Diaphragm walls & anchorages, ICE London, September 1974, 141-151.
8 Rupiper, S., 1999, Ground anchor device for penetrating an underground rock formation. U.S. Patent No 5,919,005.
9 Yoo, N. J., Park, B. S., Park, C. D., Hong, Y. G., and Lee, J. Y., 2006, Experimental study for the structural stability of permanent anchor, Journal of the Korea Institute for Structural Maintenance and Inspection, 10(5), 87-96   과학기술학회마을
10 Yun, J. M. and Song, Y. S., 2009, The behavior of earth retention wall installed in cut slope, Journal of Engineering Geology, 19(4), 475-482
11 Zubeke. R. H., 1975, Ground anchor with pivoting fluke. U.S. Patent No 3,888,057.
12 Mariupol'skii, L. G., 1965, The bearing capacity of anchor foundations, Soil Mechanics and Foundation Engineering, 2(1), 26-32.   DOI