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Upscaling of screw piles has been proposed for offshore use in foundations and anchors. This upscaling can result in a significant increase in vertical installation forces. Subsequent research has shown that this can be reduced and even eliminated by using over-flighting techniques (installation advancement ratio, AR C; 1.0), which can also improve the in-service monotonic uplift performance. In this study, centrifuge tests were conducted to investigate the cyclic and post-cyclic performance of a screw pile installed using conventional pitch-matched (AR = 1.0) and over-flighting approaches. The results suggest that, under the one-way cyclic loading investigated, it is possible to reduce displacement accumulation and capacity degradation of the screw pile with over-flighting (reduced AR) installation. Thus, adopting installation processes in sand that are contrary to published guidance can result in economic installation and improved cyclic performance for screw piles in tension which could be deployed as anchors for floating wind.
Wang et al. (Wed,) studied this question.