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东海大桥100MW海上风电示范项目中风机采用斜桩基础,必须考虑船撞作用。本文利用有限元方法,研究了斜桩基础在船撞作用下的动力响应。模拟不同工况,研究船舶吨位、船舶速度、倾斜角、桩径、桩周土体等因素对桩基的动力响应的影响。研究表明:船舶吨位和船舶速度对斜桩的动力学响应影响最大;桩的倾斜角会影响最大桩项位移,最优倾斜角约为10°;在既定的土质条件下,桩径增大到某一值后,桩基动力响应基本不变;土体较软时,桩身的最大应力较小,但最大桩顶位移较大。因此,进行斜桩设计时,必须在理论分析的基础上,选取合适的倾斜角与桩径。本文研究结果对斜桩基础在考虑船撞作用下的设计和施工有一定参考价值。
Donghai Bridge 100MW offshore wind turbine demonstration project using inclined pile foundation, you must consider the role of ship collision. In this paper, the finite element method is used to study the dynamic response of inclined pile foundations under impact. Simulation of different conditions, the study of the ship tonnage, the ship speed, tilt angle, pile diameter, soil around the pile and other factors on the dynamic response of pile foundation. The results show that the ship tonnage and the ship speed have the greatest influence on the dynamic response of the inclined piles. The inclined angle of the pile will affect the displacement of the maximum pile, the optimal inclination angle is about 10 °. Under the given soil conditions, After a certain value, the dynamic response of the pile foundation is basically unchanged; when the soil is soft, the maximum stress of the pile body is smaller, but the displacement of the maximum pile top is larger. Therefore, the design of inclined piles, the theoretical analysis must be based on the appropriate choice of tilt angle and pile diameter. The results of this paper have certain reference value for the design and construction of inclined foundation under consideration of ship collision.