United States Department of Transportation
i
Lateral Resistance of Pipe Piles Adjacent to a 15-FT High MSE Wall
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2018-08-01
[PDF-9.48 MB]
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Edition:Final Report May 2014 – Aug. 2018
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Abstract:A 15-foot tall Mechanically Stabilized Earth (MSE) retaining wall was constructed, and piles were driven at various distances behind the wall. Lateral pile load tests were conducted in the direction of the wall, and the performance of the pile, wall, and reinforcement were measured. The piles were 12.75-inch diameter pipe piles, and one half of the wall was reinforced with welded wire grid reinforcement while the other half had ribbed strip reinforcements. For each reinforcement type, tests were performed on four piles located at nominal distances of 5, 4, 3 and 2 pile diameters from the back of the wall to the center of the pile. The objective of the testing was to characterize the relationship between the lateral pile resistance and the distance of the pile behind the back face of the MSE wall. Based on the measured load-displacement curves from the tests, the lateral resistance of the piles decreased as the spacing behind the wall decreased. The results of the tests have been matched with the computer program LPILE using p-multipliers to reduce the lateral resistance for piles closer to the wall. A best-fit line was developed showing the variation of p-multiplier with normalized pile spacing behind the wall, including data from previous studies. The best-fit curve suggests that a p-multiplier of 1 (no reduction in lateral resistance) can be used when the normalized distance from the back face of the wall to the center of the pile is at least 4 pile diameters and the p-multiplier decreases relatively linearly for smaller spacings.
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