Simplified Analysis Method for Micropile Pullout Behavior
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 130, Issue 10
Abstract
Micropiles are being applied in foundation rehabilitation projects to enhance the pullout capacity of the existing foundation system and minimize the vertical deflection of the structures. Consequently, the pullout load-displacement behavior is important for the design of micropiles used for the rehabilitation of foundations subjected to pullout. In this paper, we present and evaluate analytical relationships for micropile pullout load-displacement behavior, which explicitly considers the micropile–soil interaction. The analytical relationships are kept simple and accessible to designers by assuming the micropile–soil interface to be elastoplastic. The model parameters are combined into scaling factors and a normalization factor that are found to significantly influence micropile load-displacement behavior. The closed-form analytical relationships are used to study the effect of model parameters on the predicted micropile yield behavior. The micropile load transfer behavior calculated by the model is discussed. The model is shown to replicate the field measured load-displacement curves for two cases. A variety of cases are analyzed to study the effect of grout pressure on micropile–soil interface parameters.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Baguelin, F., Frank, R., and Jezequel, J.F. ( 1982). “Parameters for friction piles in marine soils.” Proc., 2nd Int. Conf. on Numerical Methods in Offshore Piling, 197–214.
2.
Bruce, D.A., Bruce, M.E. C., and Traylor, R.P. ( 1999). “High capacity micropiles-Basic principles and case histories.” Geo-engineering for underground facilities, G. Fernandez and R. A. Bauer eds., Geotechnical Special Publication No. 90, ASCE, Reston, Va., 188–199.
3.
Coduto, D.P. ( 2001). Foundation design: Principles and practices, Prentice-Hall, Englewood Cliffs, N.J.
4.
Federal Highway Administration (FHWA). (1993). Recommendations clouterre 1991. Report No. FHWA-SA-93-026 Chap. 4 Appendix, Federal Highway Administration, U.S. Dept. of Transportation, McLean, Va., 193–202.
5.
Federal Highway Administration. (FHWA). (1997). Drilled and grouted micropiles: State-of-practice Review, Vols. I–IV, Rep. No. FHWA-RD-96-016 017, 018, 019, Federal Highway Administration, U.S. Dept. of Transportation, McLean, Va.
6.
Federal Highway Administration (FHWA). (2000). Micropile design and construction guidelines-implementation manual, Rep. No. FHWA-SA-97-070, Federal Highway Administration, U.S. Dept. of Transportation, McLean, Va.
7.
IWM99 (1999). Proc. 2nd Int. Workshop on Micropiles, Yamaguchi Univ., Ube City, Japan.
8.
Johnson, K.L. ( 1985). Contact mechanics, Cambridge University Press, London, U.K.
9.
Juran, I., and Christopher, B. (1989). “Laboratory model study on geosynthetic reinforced soil retaining walls” J. Geotech. Eng., 115(7 ), 905–926.
10.
Kraft, L. M., Ray, R. M., and Kagawa, T. (1981). “Theoretical curves” J. Geotech. Eng. 107(11 ), 1543–1561.
11.
Kulhawy, F.H. ( 1985). “Uplift behavior of shallow soil anchors- An overview.” Uplift behavior of anchor foundations in soils, S. P. Clemence ed., Vol. 126, ASCE, Reston, Va., 1–25.
12.
Laefer, D.F. ( 1999). “Geotechnical procedures for at-risk and in-distress structures,” The use of and need for preservation standards in architectural conservation L. B. Sickels-Taves, ed., ASTM STP 1355, ASTM, West Conshohocken, Pa., 211–225.
13.
Mascardi, C.A. ( 1982). “Design criteria and performance of micropiles.” Recent developments in ground improvement techniques, Balkema, Rotterdam, 439–450.
14.
Misra, A., Oberoi, R., and Kleiber, A. ( 1999). “Micropiles for seismic retrofitting of highway interchange foundation.” Proc. 2nd Int. Workshop on Micropiles, Yamaguchi Univ., Ube City, Japan, 215–223.
15.
Misra, A., and Chen, C.-H. ( 2002). “Load displacement relationships for micropiles, Deep foundations 2002: An international perspective on theory, design, construction, and performance M. W. O’Neill, and F. C. Townsend, ed., Geotechnical Special Publication No. 116, ASCE, N.Y., 110–125.
16.
Nakata, Y., and Kishishita, T. ( 1999). “Experimental study for behavior of micropile foundation.” IWM99, Proc. 2nd Int. Workshop on Micropiles, Yamaguchi Univ., Ube City, Japan, 189-194.
17.
Ostermayer, M. ( 1974). “Construction, carrying behavior, and creep characteristics of ground anchors.” Conference on diaphragm walls and anchorages, Institute of Civil Engineers, London, U.K.
18.
Reese, L.C., and O’Neill, M.W. ( 1987). “Drilled shafts: Construction procedures and design methods.” Rep. No. FHWA-HI-88-042, Federal Highway Administration, U.S. Dept. of Transportation, McLean, Va.
19.
, V. R. Schaefer, et al., eds. ( 1997). “Ground improvement ground reinforcement ground treatment.” Geotechnical Special Publication No. 69, ASCE, N.Y., 151–217.
20.
Scott, R.F. ( 1981). Foundation analysis, Prentice-Hall, Englewood Cliffs, N.J.
21.
Taylor, G.E., Gularte, F.B., and Gularte, G.G. ( 1998). “Seismic retrofit of Fourth Street and Riverside viaducts with micropiles” Soil improvement for big digs, A. Maher, and D. S. Yang, eds., Geotechnical Special Publication No. 81, ASCE, Reston, Va, 313–325.
22.
Zelenko, B.H., Bruce, D.A., Schoenwolf, D.A., and Traylor, R.P. ( 1998). “Micropile applications for seismic retrofit preserves historic structure in old San Juan, Puerto Rico.” Grouts and grouting, L. Johnsen, and D. Berry, eds., Geotechnical Special Publication No. 80, ASCE, Reston, Va., 43–62.
Information & Authors
Information
Published In
Copyright
Copyright © 2004 ASCE.
History
Published online: Oct 1, 2004
Published in print: Oct 2004
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.