Field Testing and Analyses of a Batter Pile Group Foundation under Lateral Loading

Abstract

Much of the new I-10 Twin Span Bridge, built over Lake Pontchartrain between New Orleans and Slidell, Louisiana, is supported by driven batter pile group foundations. To assess the methodology used to design and analyze batter pile foundations and to evaluate their performance under lateral loading, a full-scale lateral load test was conducted on an M19 eastbound pier of the new bridge. The M19 pier foundation consisted of 24 precast, prestressed concrete 110-ft-long batter piles; eight piles were instrumented with in-place inclinometers (IPIs), and 12 piles were instrumented with strain gauges. The test was conducted by pulling the M19 eastbound and westbound piers toward each other with high-strength steel tendons. A maximum 1,870-kip lateral load was applied in increments. A high-order polynomial curve-fitting method was applied for each load increment to fit the measured rotation profiles from the IPIs, and the fitted rotation curves were used to deduce the bending moment, shear force, and soil reaction profiles on the basis of specific mathematical derivations. The calculated moments from curve fitting were compared with the moments calculated from strain gauge measurements, and the results showed good agreement. The soils’ p-y curves at different depths were backcalculated from the derived soil reaction profiles. The resulting p-y curves showed no evidence of group effect. The FB-MultiPier program was also used to analyze the behavior of the M19 pier foundation under lateral loading. Comparison of FB-MultiPier results with measured values as well as values calculated from polynomial curve fitting showed that FB-MultiPier overpredicted the lateral deformations of batter pile group foundations.

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References

Matlock

Correlations for Design of Laterally Loaded Piles in Soft Clay. Proc. 2nd Offshore Technology Conference, Houston, Tex., 1970.

Reese

L. C.

, Cox

W. R.

, and Koop

F. D.

Analysis of Laterally Loaded Piles in Sand. Proc. 6th Offshore Technology Conference, Houston, Tex., 1974.

Reese

L. C.

, Cox

W. R.

, and Koop

F. D.

Field Testing and Analysis of Laterally Loaded Piles in Stiff Clay. Proc. 7th Offshore Technology Conference, Houston, Tex., 1975, pp. 672–690.

Reese

L. C.

, and Welch

R. C.

Lateral Loading of Deep Foundations in Stiff Clay. Journal of Geotechnical Engineering Division, ASCE, Vol. 101, No. 7, 1975, pp. 633–694.

O'Neill

M. W.

, and Murchison

J. M.

Evaluation of p-y Relationships in Cohesionless Soils. Proc. Symposium on Analysis and Design of Pile Foundations, San Francisco, Calif., ASCE, Reston, Va., 1984, pp. 174–191.

O'Neill

M. W.

, and Gazioglu

S. M.

Evaluation of p-y Relationships in Cohesive Soils. Proc. Symposium on Analysis and Design of Pile Foundations, San Francisco, Calif., ASCE, Reston, Va., 1984, pp. 192–213.

Matlock

, Ingram

W. B.

, Kelley

A. E.

, and Bogard

Field Tests of the Lateral Load Behavior of Pile Groups in Soft Clay. Proc. 12th Annual Offshore Technology Conference, Houston, Tex., 1980.

Brown

D. A.

, Reese

L. C.

, and O'Neill

M. W.

Cyclic Lateral Loading of a Large-Scale Pile Group. Journal of Geotechnical Engineering, Vol. 113, No. 11, 1987, pp. 1326–1343.

Rollins

M. K.

, Peterson

T. K.

, and Weaver

J. T.

Lateral Load Behavior of Full-Scale Pile Group in Clay. Journal of Geotechnical and Geoenvironmental Engineering, Vol. 124, No. 6, 1998, pp. 468–478.

10.

McVay

C. M.

, Wasman

J. S.

, Consolazio

R. G.

, Bullock

J. P.

, Cowan

G. D.

, and Bollmann

T. H.

Dynamic Soil–Structure Interaction of Bridge Substructure Subject to Vessel Impact. Journal of Geotechnical and Geoenvironmental Engineering, Vol. 14, No. 1, 2009, pp. 7–16.

11.

Zhang

L. M.

, McVay

C. M.

, and Lai

Numerical Analysis of Laterally Loaded 3 × 3 to 7 × 3 Pile Groups in Sands. Journal of Geotechnical and Geoenvironmental Engineering, Vol. 125, No. 11, 1999, pp. 936–946.

12.

Zhang

L. M.

, McVay

C. M.

, Han

J. S.

, Lai

W. P.

, and Gardner

Effects of Dead Loads on the Lateral Response of Battered Pile Groups. Canadian Geotechnical Journal, Vol. 39, No. 3, 2002, pp. 561–575.

13.

Rajashree

S. S.

, and Sitharam

G. T.

Nonlinear Finite-Element Modeling of Batter Piles Under Lateral Load. Journal of Geotechnical and Geoenvironmental Engineering, Vol. 127, No. 7, 2001, pp. 604–612.

14.

Poulos

H. G.

Behavior of Laterally Loaded Piles: II-Pile Groups. Journal of Soil Mechanics Foundation, Vol. 97, No. 5, 1971, pp. 733–751.

15.

Ashour

, Norris

, and Pilling

Strain Wedge Model Capability of Analyzing Behavior of Laterally Loaded Isolated Piles, Drilled Shafts, and Pile Groups. Journal of Bridge Engineering, Vol. 7, No. 4, 2002, pp. 245–254.

16.

Dunnavant

T. W.

Experimental and Analytical Investigation of the Behavior of Single Piles in Overconsolidated Clay Subjected to Cyclic Lateral Loads. PhD dissertation. University of Houston, Houston, Tex., 1986.

17.

Wilson

Soil–Pile–Superstructure Interaction in Liquefying Sand and Soft Clay. PhD dissertation. University of California, Davis, 1998.

18.

Brown

D. A.

, Hidden

A. S.

, and Zhang

Determination of p-y Curves Using Inclinometer Data. Geotechnical Testing Journal, Vol. 17, 1994, pp. 150–158.

19.

Liao

C. J.

, and Lin

S. S.

An Analytical Model for Deflection of Laterally Loaded Piles. Journal of Marine Science and Technology, Vol. 11, No. 3, 2003, pp. 149–154.

20.

Lin

S. S.

, Liao

J. C.

, Chen

T. J.

, and Chen

Lateral Performance of Piles Evaluated via Inclinometer Data. Computer and Geotechnics, Vol. 32, 2005, pp. 411–421.

21.

Nip

D. C. N.

, and Ng

C. W. W.

Back Analysis of Laterally Bored Piles. Geotechnical Engineering, Vol. 158, No. GE2, 2005, pp. 63–73.

22.

Giannakou

, Gerolymos

, Gazetas

, Tazoh

, and Anastasopoulos

Seismic Behavior of Batter Piles: Elastic Response. Journal of Geotechnical and Geoenvironmental Engineering, Vol. 136, No. 9, 2010, pp. 1187–1199.

23.

Florida Bridge Software Institute. FB-MultiPier User's Manual. University of Florida, Gainesville, 2005.

24.

Anderson

J. B.

, Townsend

R. C.

, and Grajales

Case History Evaluation of Laterally Loaded Piles. Journal of Geotechnical and Geoenvironmental Engineering, Vol. 129, No. 3, 2003, pp. 187–196.

25.

Zhang

, and Tumay

M. T.

Statistical to Fuzzy Approach Toward CPT Soil Classification. Journal of Geotechnical and Geoenvironmental Engineering, Vol. 125, No. 3, 1999, pp. 179–186.

26.

Abu-Farsakh

, Yoon

, Ha

, Marr

, Zhang

, and Tsai

A Smart Health Monitoring System for the New I-10 Twin Span Bridge over Lake Pontchartrain. Proc. Advances in Analysis, Modeling and Design, GeoFlorida 2010, West Palm Beach, Fla. Geotechnical Special Publication No. 199. ASCE, Reston, Va., pp. 960–969.

27.

Brown

D. A.

, Morrison

, and Reese

L. C.

Lateral Load Behavior of Pile Groups in Sand. Journal of Geotechnical Engineering, 1988, pp. 1261–1276.

28.

Peck

R. B.

, Hanson

W. E.

, and Thornburn

T. H.

Foundation Engineering, 2nd ed. John Wiley & Sons, Inc., New York, 1974.

29.

Bowles

J. E.

Foundation Analysis and Design, 2nd ed. McGraw-Hill Book Company, New York, 1977, pp. 85–86.

30.

Davisson

M. T.

Lateral Load Capacity Piles. In Highway Research Record 333, HRB, National Research Council, Washington, D.C., 1970, pp. 104–112.

31.

Yang

, and Jeremic

Numerical Study of Group Effects for Pile Groups in Sands. International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 26, 2002, pp. 1385–1406.