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A Case History of Liquefaction Mitigation using Driven Displacement Piles
Significant densification can be achieved using driven displacement piles, which act to mitigate liquefaction through both densification and reinforcement. Recent research on driven displacement piles was used as a basis to offer an alternative to earthquake drains for the mitigation of liquefaction of a 4-story structure along coastal South Carolina. The subsurface conditions consisted of fine, clean to slightly silty, very loose to medium dense sands over a deep, dense sand layer and the marl of the Cooper group. A test program was conducted in order to evaluate the change in cone tip resistance and estimated post-shaking settlements in the liquefaction susceptible layer following pile installation. Two 10-pile groups were driven as part of the test program: one with 1.2 m triangular spacing, and one with 1.8 m triangular spacing. Pre- and post-installation cone penetration tests and shear wave velocity tests were conducted at the center of each of the groups to enable comparisons between the two test pile groups. Liquefaction triggering and post-shaking settlement analyses were conducted and compared to the pre-treatment condition for the design seismic event. The paper concludes with a discussion of the design philosophy and performance criteria and basis for selection of the actual pile group spacing used for the project.
A Case History of Liquefaction Mitigation using Driven Displacement Piles
Significant densification can be achieved using driven displacement piles, which act to mitigate liquefaction through both densification and reinforcement. Recent research on driven displacement piles was used as a basis to offer an alternative to earthquake drains for the mitigation of liquefaction of a 4-story structure along coastal South Carolina. The subsurface conditions consisted of fine, clean to slightly silty, very loose to medium dense sands over a deep, dense sand layer and the marl of the Cooper group. A test program was conducted in order to evaluate the change in cone tip resistance and estimated post-shaking settlements in the liquefaction susceptible layer following pile installation. Two 10-pile groups were driven as part of the test program: one with 1.2 m triangular spacing, and one with 1.8 m triangular spacing. Pre- and post-installation cone penetration tests and shear wave velocity tests were conducted at the center of each of the groups to enable comparisons between the two test pile groups. Liquefaction triggering and post-shaking settlement analyses were conducted and compared to the pre-treatment condition for the design seismic event. The paper concludes with a discussion of the design philosophy and performance criteria and basis for selection of the actual pile group spacing used for the project.
A Case History of Liquefaction Mitigation using Driven Displacement Piles
Stuedlein, Armin W. (author) / Allen, Michael L. (author)
IFCEE 2018 ; 2018 ; Orlando, Florida
IFCEE 2018 ; 253-262
2018-06-06
Conference paper
Electronic Resource
English
A Case History of Liquefaction Mitigation using Driven Displacement Piles
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