Optimization of Seawall Design at Alameda Marina

September 22, 2022
Optimization of Seawall Design at Alameda Marina

Seawall design and construction have advanced immensely over the past 1,500 years. Modern designs employ a wide array of construction means and are built with various materials. From a practical and economic perspective, selecting the optimal seawall for a specific site is an essential and challenging engineering subject. At Alameda Marina, highly variable site conditions required systematic evaluation of many types of seawalls to achieve a cost-effective design and minimize the risks for construction claims. The evaluation criteria for selecting seawalls included cost, seismic robustness, durability, constructability, considering possible underground obstructions, and environmental restrictions. As a result, three different types of seawalls were selected for construction: (1) a soldier pile and lagging system was selected for the seawall at the west segment of the shoreline, (2) a reinforced concrete L-wall on piles was selected at the central segment of the shoreline, and (3) a sheet pile wall with tiebacks and deadman was selected at the east segment of the shoreline. Compared to the preliminary concept design, the final design of the seawalls achieved a significant cost saving with improved constructability and minimal risks for project cost escalation.

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