Bearing Capacity of Auger‐Cast Piles in Sand
Publication: Journal of Geotechnical Engineering
Volume 117, Issue 2
Abstract
Auger‐cast piles are formed by drilling a continuous flight auger into the ground and, on reaching the required depth, pumping grout or concrete down the hollow stem as the auger is steadily withdrawn. The sides of the hole are supported by the soil‐filled auger, eliminating the need for temporary casing or bentonite slurry. This paper outlines important features of auger‐cast pile installation that influence the structural integrity and geotechnical capacity of completed piles. These include soil decompression, correlation between the rotational and vertical speeds of the auger, and precise coordination of auger extraction and grout supply. The results of 66 loading tests on auger‐cast piles in sand are presented. Shaft resistance is found to be independent of the relative density of the sand, while point resistance can be directly correlated with results of standard penetration and cone penetrometer tests. Empirical design methods for bored piles were found to underestimate the failure loads of auger‐cast piles. New correlations, based on pile length and standard penetration resistance, are proposed.
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References
1.
Briaud, J. L. (1988). “Evaluation of cone penetration test methods using 98 pile load tests.” Proc. First Int. Symp. on Penetration Testing, ISOPT‐1, Orlando, Fla., 2, 687–697.
2.
Briaud, J. L., and Tucker, L. M. (1988). “Measured and predicted axial response of 98 piles.” J. Geotech. Engrg., 114(9), 984–1001.
3.
Chin, F. K., and Vail, A. J. (1973). “Behavior of piles in alluvium.” Proc. Eighth Int. Conf. on Soil Mech. and Found. Engrg., Moscow, Soviet Union, 2.1, 47–52.
4.
Couldery, P. A. J., and Fleming, W. G. K. (1987). “Continuous flight auger piling at St. Enoch Square, Glasgow.” Ground Engrg., London, U.K., 20(6), 17–28.
5.
Coyle, H. M., and Castello, R. (1981). “New design correlations for piles in sand.” J. Geotech. Engrg., ASCE, 107(7), 965–986.
6.
Douglas, D. J. (1983). Discussion on Papers 17‐22: Case histories, Proc. Conf. On Piling and Ground Treatment, Institution of Civil Engineers, London, 283.
7.
Douglas, B. J., and Olsen, R. S. (1981). “Soil classification using electric cone penetrometer.” Proc. Symp. on Cone Penetration Testing and Experience, St. Louis, Mo., ASCE, 209–227.
8.
Everett, J. P., Wilson, C., and Knight, K. (1984). “Load tests on three different pile types in Durban.” Symp. on Piling along the Natal Coast, S.A., Institution of Civil Engineers, Durban, South Africa.
9.
Kulhawy, F. H. (1984). “Limiting tip and side resistance: fact or fallacy?” Proc. ASCE Symp. on Analysis and Design of Pile Foundations, San Francisco, Calif., 80–98.
10.
Massarsch, K. R., Brieke, W., and Tancre, E. (1988). “Displacement auger piles with compacted base.” Proc. First Int. Geotech. Seminar on Deep Foundations on Bored and Auger Piles, W. F. Van Impe, ed., Ghent, Belgium.
11.
Meyerhof, G. G. (1976). “Bearing capacity and settlement of pile foundations.” J. Geotech. Engrg., ASCE, 102(3), 197–228.
12.
Montgomery, M. W. (1980). “Prediction and verification of friction pile behavior.” Proc. ASCE Symp. on Deep Foundations, Atlanta, Ga., 274–287.
13.
Neate, J. J. (1988). “Augered cast‐in‐place piles.” 13th Annual Meeting, Deep Foundations Institute, Atlanta, Ga., 167–175.
14.
O'Dell, L. G., and Pool, J. M. (1979). “Auger‐placed grout piles in gravel.” Proc. ASCE Symp. on Deep Foundations, Atlanta, Ga., 300–310.
15.
O'Neill, M. W., and Reese, L. C. (1978). “Load transfer in a slender drilled pier in sand.” Preprint 3141, ASCE Spring Convention and Exposition, Pittsburgh, Pa.
16.
O'Rourke, T. D., and Kulhawy, F. H. (1985). “Observations on load tests for drilled shafts.” Drilled Piers and Caissons II, ASCE, Denver, Colo., 113–128.
17.
Robertson, P. K., Campanella, R. G., and Wightman, A. (1983). “SPT‐CPT correlations.” J. Geotech. Engrg., ASCE, 109(11), 1449–1459.
18.
Roscoe, G. H. (1983). “The behavior of flight auger bored piles in sand.” Proc. Conf. on Piling and Ground Treatment, Institution of Civil Engineers, London, U.K., 241–250.
19.
Touma, F. T., and Reese, L. C. (1974). “Behavior of bored piles in sand.” J. Geotech. Engrg., ASCE, 100(7), 749–761.
20.
van den Elzen, L. W. A. (1979). “Concrete screw piles, a vibrationless, non‐displacement piling method.” Proc. Conf. on Recent Developments in the Design and Construction of Piles, Institution of Civil Engineers, London, U.K., 67–71.
21.
Vijayvergiya, V. N., and Focht, J. A., Jr. (1972). “A new way to predict the capacity of piles in clay.” Fourth Annual Offshore Tech. Conf., Houston, Tex., 2, 865–874.
22.
Webb, D. L., and Moore, L. W. (1984). “The performance of pressure grouted auger piles in Durban.” Symp. on Piling along the Natal Coast, S.A., Institution of Civil Engineers, Durban, South Africa.
23.
Wright, S. J., and Reese, L. C. (1979). “Design of large diameter bored piles.” Ground Engrg., London, U.K., 12(8), 17–19, 21–23, 51.
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Copyright © 1991 ASCE.
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Published online: Feb 1, 1991
Published in print: Feb 1, 1991
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