A robust geotechnical design optimization procedure for piled-raft foundation to support a 130 m tall wind turbine on clayey soil is presented in this study. The initial geotechnical design indicated that the differential settlement of the piled-raft system controls the final design. A parametric study was conducted by varying the wind speed and undrained cohesion to establish a relationship between the design variables (number and length of pile and radius of raft) and random variables (wind speed and undrained cohesion). Finally, a robust design optimization was conducted considering the material cost and the robustness as the objectives. The standard deviation of the response which is the differential settlement of the foundation system was considered as the measure of robustness of the design. The optimization yielded a set of acceptable designs and presented as a Pareto front which can be used to select the best design using the knee point concept.
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