Results of full-scale lateral load tests performed on a 0.6-m diameter cast-in-steel-shell (CISS) pile in liquefied sand and stone column improved ground are presented. Cone penetration test results show up to 5 times greater tip resistance after stone column installation. The lateral stiffness of the soil-pile system for the stone column improved ground increased by approximately 44% under static load conditions and approximately 350% when compared to the pile head response after pore water pressures were increased by detonation of down-hole explosives. Analyses show a poor correlation between measured and predicted pile response for the static load case after installation of stone columns. However, the analyses compare reasonably with the measured pile response after detonation of the down-hole explosives. Variation of the calculated pile response resulting from variation in the estimated soil properties was quantified and found to be negligible at this site.
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