Development of t-z Curves for Cemented Fine-Grained Soil Deposits
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Volume 121, Issue 12
Abstract
Drilled shaft load-settlement analysis is frequently performed using load-transfer curves known as t-z curves. Many t-z curves are discussed in the literature, and are often used for approximate analyses. The peak skin friction is generally considered to be developed with deflections on the order of 6–12 mm (0.25–0.5 in.) or 0.5–1% of the shaft diameter. The results of several load tests in calcareous cemented fine-grained soils in the arid southwestern United States are reviewed. It is demonstrated that significantly higher deflections are required to develop the peak skin friction in these soils than in the soils for which most of the available curves were developed. Deflections at peak skin friction are typically 25 mm (1 in.) or more. This results in an increase in the deflection required to attain a given fraction of ultimate load. Although cemented soil deposits have high shear-strength parameters, deflections may exceed expectations for working loads.
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References
1.
Beckwith, G. H., and Bedenkop, D. V. (1973). “An investigation of the load carrying capacity of drilled cast-in-place concrete piles bearing on coarse granular soils and cemented alluvial fans.”Rep. No. AHD-RD-10-122, Arizona Hwy. Dept., Phoenix, Ariz.
2.
Beckwith, G. H., and Hansen, L. A. (1982). “Calcareous soils of the Southwestern United States.”Geotechnical properties, behavior, and performance of calcareous soils; ASTM STP 777, K. R. Demars and R. C. Chaney, eds., ASTM, Philadelphia, Pa., 16–35.
3.
Coyle, H. M., and Reese, L. C.(1966). “Load transfer for axially loaded piles in clay.”J. Soil Mech. and Found. Div., ASCE, 92(2), 1–26.
4.
Coyle, H. M., and Sulaiman, I. H.(1967). “Skin friction for steel piles in sand.”J. Soil Mech. and Found. Div., ASCE, 93(6), 261–79.
5.
Diagnosis and improvement of saline and alkaline soils; agricultural handbook number 60. (1954). L. A. Richards, ed., U.S. Dept. of Agr. (USDA), U.S. Govt. Printing Ofc., Washington, D.C.
6.
Federal Highway Administration (FHwA). (1988). Drilled shafts, construction procedures and design methods . Publ. No. FHWA-HI-88-042, Washington, D.C.
7.
Gile, L. H., Peterson, F. F., and Grossman, R. B.(1966). “Morphological and genetic sequences of carbonate accumulation in desert soils.”Soil Sci., 101(55), 347–60.
8.
Haire, S. A. (1990). “Geotechnical investigation, Salt River Bridge, East Papago Freeway—Section 6.”ADOT Proj. No. RAM-600-5-301D, TRACS No. 202L-MA-OH-0855-01D, Arizona Dept. of Transp., Phoenix, Ariz.
9.
Kandaris, P. M., Kondziolka, R. E., and Rojas-Gonzalez, L. F. (1993). “Electric transmission line foundations in cemented soils; a case history.”Proc., Int. Symp. on Hard Soils—Soft Rocks, A. Arragnostopoulos, et al., eds., A. A. Balkema, Rotterdam, The Netherlands, 985–992.
10.
Kraft, L. M., Ray, R. P., and Kagawa, T.(1981). “Theoretical t-z curves.”J. Geotech. Engrg. Div., ASCE, 107(11), 1543–1561.
11.
Kulhawy, F. H., and Hirany, A. (1989). “Interpretation of load tests on drilled shafts. II: axial uplift.”Foundation engineering: current principles and practices; Proc., Found. Engrg. Congr., F. H. Kulhawy, ed., ASCE, New York, N.Y., 1150–1158.
12.
Kulhawy, F. H., and Jackson, C. S. (1989). “Some observations on undrained side resistance of drilled shafts.”Foundation engineering: current principles and practices; Proc., Found. Engrg. Congr., F. H. Kulhawy, ed., ASCE, New York, N.Y., 1011–1025.
13.
Moore, D. W., and Gillam, M. L. (1984). “Road log—quaternary deposits and soils in the Durango area, Southwestern Colorado.”Field trip guidebook; Proc., 37th Annu. Meeting, Rocky Mountain Sect., Geological Soc. of Am., D. C. Brew, ed., Four Corners Geological Soc., Durango, Colo., 183–209.
14.
Reese, L. C., and Wang, S.-T. (1990). APILE2: analysis of load versus settlement for axially-loaded deep foundations . Ensoft Inc., Austin, Tex.
15.
Reese, L. C., and O'Neill, M. W. (1988). “Field load tests of drilled shafts.” Deep foundations on bored and auger piles: Proc. 1st Int. Geotech. Seminar on Deep Found. on Bored and Auger Piles., W. F. Van Impe, ed., A. A. Balkema, Rotterdam, The Netherlands, 145–191.
16.
Reese, L. C., and O'Neill, M. W. (1989). “New design method for drilled shafts from common soil and rock tests.”Proc. Found. Engrg. Congr., F. H. Kulhawy, ed., ASCE, New York, N.Y., 1026–1039.
17.
Standard specifications for highway bridges, Sect. 4, 15th Ed. (1992). Am. Assoc. of State Hwy. and Transp. Officials (AASHTO), Washington, D.C.
18.
Terzaghi, K., and Peck, R. B. (1967). Soil mechanics in engineering practice . John Wiley & Sons, Inc., New York, N.Y.
19.
Walsh, K. D. (1992). “Drilled shaft load test research program, Salt River Viaduct, East Papago Freeway, design section 6.”Final Rep.; Contract No. 90-24, Arizona Dept. of Transp., Phoenix, Ariz.
20.
Walsh, K. D. (1993). “The skin friction behavior of deep foundations in cemented soils,” PhD thesis, Arizona State Univ., Tempe, Ariz.
21.
Wang, S.-T., and Reese, L. C. (1990). “Axial-load test capacity of drilled shaft on East Papago Freeway, Phoenix, Arizona.”Final Rep. Contract No. 90-24, Arizona Dept. of Transp., Phoenix, Ariz., C1–C27.
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Published In
Journal of Geotechnical Engineering
Volume 121 • Issue 12 • December 1995
Pages: 886 - 895
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: Dec 1, 1995
Published in print: Dec 1995
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