Lateral soil-pile interaction of large-diameter rigid monopiles supporting OWTs in clay: Insights and an enhanced theoretical model

Shao，Xiaodong1,2; Fu，Yong2; Jiang，Chong1

2024-09-01

10.1016/j.apor.2024.104093

Applied Ocean Research   影响因子和分区

0141-1187

The application of large-diameter rigid monopiles is a growing trend in offshore wind turbine projects. Among the various models used to simulate the lateral response of these monopiles, the {‘p−y’+‘M−θ’} model has emerged as an effective choice. However, this model has certain limitations, such as its inability to capture the rotation flow mechanism above the pile rotation center and its neglect of vertical friction at soil-pile interface. To address these limitations and enhance our understanding of soil-pile interaction mechanisms for large-diameter rigid monopiles, we develop a modified {‘p−y’+‘M−θ’+‘m−θ’} model that accurately captures all three components of soil-pile interaction. This improved model expands the upper range dominated by the concentrated rotation spring to include depths where shear force on the pile section approaches zero, and incorporates distributed moment resistance from vertical shaft friction into consideration. We present several validation cases that demonstrate its superiority over previous methods such as API method and {‘p−y’+‘M−θ’} method. Additionally, through parametric analysis based on our proposed method, we investigate how pile diameter and eccentricity influence internal mechanisms of soil-pile interaction. Our findings reveal that vertical friction at the soil-pile interface plays a significant role in large-diameter cases while rotation flow mechanism dominates in situations with large-eccentricity. Furthermore, we provide a concise empirical expression for estimating lateral bearing capacity of large-diameter rigid monopiles at serviceability limit state which can be conveniently applied during preliminary design stages in practical engineering.

Eccentricity effect Large-diameter rigid monopiles Lateral response Pile diameter effect Soil flow mechanism Soil-pile interaction

SCI ; EI

英语

其他

20242516271247

Friction ; Offshore oil well production ; Rotation ; Soils

Structural Members and Shapes:408.2 ; Soils and Soil Mechanics:483.1 ; Oil Field Production Operations:511.1 ; Mechanics:931.1

ENGINEERING

2-s2.0-85196023812

Scopus

1.School of Resources and Safety Engineering,Central South University,Changsha,410083,China
2.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Shao，Xiaodong,Fu，Yong,Jiang，Chong. Lateral soil-pile interaction of large-diameter rigid monopiles supporting OWTs in clay: Insights and an enhanced theoretical model[J]. Applied Ocean Research,2024,150.

Shao，Xiaodong,Fu，Yong,&Jiang，Chong.(2024).Lateral soil-pile interaction of large-diameter rigid monopiles supporting OWTs in clay: Insights and an enhanced theoretical model.Applied Ocean Research,150.

Shao，Xiaodong,et al."Lateral soil-pile interaction of large-diameter rigid monopiles supporting OWTs in clay: Insights and an enhanced theoretical model".Applied Ocean Research 150(2024).