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LATERALLY LOADED LARGE DIAMETER PILES - Professor Jean-Louis BRIAUD

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How well are current P-y curves are predicting the behavior of large diameter piles subjected to monotonic lateral loading?

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LATERALLY LOADED LARGE DIAMETER PILES

The question to be answered is how well are current P-y curves are predicting the behavior of large diameter piles subjected to monotonic lateral loading? Current P-y curves were developed about 60 years ago based on lateral load tests on piles which ranged from 0.3 to 0.6 m in diameter. Today’s pile diameters can reach 4 m or more. This significant difference in scale brings into question the applicability of these early P-y curves to today’s large diameter piles. A horizontal load tests database of 46 piles with diameters larger than 1.5 m (up to 3.0 m) and 64 piles with diameters less than 1.5 m both in sand and in clay was assembled. Predictions of load and displacement are carried out using commonly used P-y curves and the software LPILE. These predictions are compared to the measured loads and measured displacements. The ratio of predicted over measured quantities is plotted against pile diameter and trends are noted. Then, modifications to the p-y curves are proposed so that the ratio of predicted over measured displacement remains approximately independent of diameter. Finally, the probability that the predictions will be unsafe is evaluated.

About the Speaker: Professor Jean-Louis BRIAUD, PhD, PE, DGE, Distinguished Member ASCE, ASCE President

Professor Jean-Louis Briaud is a Distinguished Professor and Holder of the Spencer J. Buchanan Chair in the Zachry Department of Civil and Environmental Engineering at Texas A&M University, a Distinguished Member of the American Society of Civil Engineers, and a Professional Engineer. He received his bachelor’s degree in France in 1972 and his Ph.D. degree from the University of Ottawa in Canada in 1979. He is currently President of the American Society of Civil Engineers. Among other awards, he has received the ASCE Ralph Peck Award from the USA, the CGS Geoffrey Meyerhof Foundation Engineering Award from Canada, the Honorable Aitalyev Medal from Kazakhstan, and is a member of the National Academy of Natural Sciences in Russia. He has supervised 50 PhD students and 90 Master students. He is the author of a book entitled Geotechnical Engineering and one entitled The Pressuremeter; he has published about 300 articles and reports. He enjoys tennis, soccer, and rugby, and plays jazz piano at the amateur level.


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