United States Department of Transportation
i
Lateral Resistance of H-Piles and Square Piles Behind an MSE Wall With Ribbed Strip and Welded Wire Reinforcements
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2018-08-01
[PDF-8.18 MB]
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Edition:Final Report May 2014 – Aug. 2018
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Abstract:A 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. For this part of the overall study, the piles were 12-inch H-piles and square piles. Four H-piles were tested with ribbed strip soil reinforcement at a wall height of 15 feet, and four square piles were tested with welded wire soil reinforcement at a wall height of 20 feet. The H-piles were spaced from the back face of the MSE wall at nominal distances of 4.5, 3.2, 2.5, and 2.2 pile diameters. The square piles were spaced from the wall at nominal distances of 5.7, 4.2, 3.1, and 2.1 pile diameters. 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. P-multipliers were developed to account for reduced lateral resistance for each pile. 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. Multilinear regression equations were developed to compute the maximum tensile force on the reinforcement as a function of pile head load and other factors
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