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Open AccessArticle

Scour Effects on the Lateral Behavior of a Large-Diameter Monopile in Soft Clay: Role of Stress History

1
Power China Huadong Engineering Limited Corporation, Hangzhou 310058, China
2
Key Laboratory of Offshore Geotechnics and Material of Zhejiang Province, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
3
Ming Yang Smart Energy Group Co. LTD, Guangzhou 510000, China
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2019, 7(6), 170; https://doi.org/10.3390/jmse7060170
Received: 23 March 2019 / Revised: 27 May 2019 / Accepted: 27 May 2019 / Published: 1 June 2019
(This article belongs to the Special Issue Coastal Geohazard and Offshore Geotechnics)
Scouring of soil around large-diameter monopile will alter the stress history, and therefore the stiffness and strength of the soil at shallow depth, with important consequence to the lateral behavior of piles. The existing study is mainly focused on small-diameter piles under scouring, where the soil around a pile is analyzed with two simplified approaches: (I) simply removing the scour layers without changing the strength and stiffness of the remaining soils, or (II) solely considering the effects of stress history on the soil strength. This study aims to investigate and quantify the scour effect on the lateral behavior of monopile, based on an advanced hypoplastic model considering the influence of stress history on both soil stiffness and strength. It is revealed that ignorance about the stress history effect (due to scouring) underestimates the extent of the soil failure wedge around the monopile, while overestimates soil stiffness and strength. As a result, a large-diameter pile (diameter D = 5 m) in soft clay subjected to a souring depth of 0.5 D has experienced reductions in ultimate soil resistance and initial stiffness of the p-y curves by 40% and 26%, and thus an increase of pile head deflection by 49%. Due to the inadequacy to consider the stress history effects revealed above, the existing approach (I) has led to non-conservative estimation, while the approach (II) has resulted in an over-conservative prediction. View Full-Text
Keywords: scour; soft clay; monopile; stress history; hypoplastic model scour; soft clay; monopile; stress history; hypoplastic model
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MDPI and ACS Style

He, B.; Lai, Y.; Wang, L.; Hong, Y.; Zhu, R. Scour Effects on the Lateral Behavior of a Large-Diameter Monopile in Soft Clay: Role of Stress History. J. Mar. Sci. Eng. 2019, 7, 170.

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