Manhattan Cruise Terminals Geotechnical Assessment: Analysis of Timber Piles in Soft Organic Silts-Video

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Pannoni Engineering conducted a geotechnical assessment of Manhattan Cruise Terminal Piers 88, 90, 92, and 94 to support a structural stability evaluation. The team reviewed historical investigations, drilled six additional borings, collected soil samples, and performed laboratory testing. Subsurface conditions were primarily very soft organic silt over steeply dipping bedrock, with occasional deeper sand layers.<br /><br />At Pier 88, sonic testing estimated timber piles averaged 70 feet long, but capacity calculations indicated that roughly 100 feet of total pile length was needed to meet the original 18-ton design capacity. The engineers concluded that undocumented pile splices may account for the difference and noted that sonic testing alone may not reliably establish pile length or capacity.<br /><br />Analyses produced bearing-capacity estimates, lateral and axial soil-spring curves, and settlement predictions. Primary consolidation and negative skin friction were estimated to contribute about 21 inches of settlement, broadly consistent with observed conditions. Structural-model results generally supported the geotechnical estimates, with localized additional settlement linked to later loading and renovations.

Keywords

geotechnical assessment

Manhattan Cruise Terminal

Pier 88

pile capacity

settlement analysis