United States Department of Transportation
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Lateral Resistance of Abutment Piles Behind Mechanically Stabilized Earth (MSE) Walls: Final Summary Report #1 for Study TPF-5(272)
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2018-08-01
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[PDF-1.06 MB]
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Edition:Final Summary Report #1 May 2014 – Aug. 2018
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Abstract:A full-scale mechanically stabilized earth (MSE) wall was constructed and 24 lateral load tests were conducted on piles spaced at distances of about 2 to 5 pile diameters (D) from the back face of the wall to the center of the pile. Sixteen of the tests involved pipe piles, four tests involved H-piles, and four tests involved square piles. Lateral resistance decreased significantly when piles were located closer than about 4D from the wall. P-multipliers were developed to account for the reduction in lateral soil resistance as a function of normalized distance behind the wall using results from these tests and eight previous full-scale tests. P-multipliers were approximately one for piles located further than about 4D from the wall, while p-multipliers decreased linearly as distance to the wall decreased. P-multipliers were not significantly affected by differences in reinforcement length to height (L/H) ratio, reinforcing type, or pile shape, but provided a reasonable means for estimating reduced lateral pile resistance. Measured tensile force in the reinforcements tended to reach a peak near the location of the pile rather than at the wall face, indicating that the reinforcements were anchoring the wall against lateral movement. Multi-linear regression equations were developed to predict maximum tensile force in the reinforcements. Tensile force tended to increase as pile head load and vertical stress increased, and it tended to decrease with increases in transverse distance from the load point and normalized distance from the wall. This is the Final Summary Report #1 for pooled fund study TPF-5(272), “Evaluation of Lateral Pile Resistance Near MSE Walls at a Dedicated Wall Site.” Details of the research described in this report are available in three research final reports published by the Utah Department of Transportation, as prepared by Rollins et al. (2018a), Rollins et al. (2018b), and Rollins and Luna (2018), along with corresponding university theses.
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