倾斜荷载作用下吸力桶基础不排水上拔承载特性研究

Undrained uplift bearing capacity of suction bucket foundations under inclined loads

针对吸力桶在工作过程中上拔力对其承载性能产生影响的问题,基于有限元的方法,对不同长径比、不同强度分布条件下吸力桶基础在倾斜荷载作用下的承载特性进行研究,建立了竖向和水平承载力系数与长径比(L/D)和土质不均匀系数K之间的关系并给出了其计算方法,建立了竖向荷载(V)与水平荷载(H)承载力包络面,最终给出了V-H组合条件下承载力计算方法,研究成果可为海洋浮式结构抗拔基础设计提供依据。

Aiming at the problem that the suction force of the suction bucket affects its bearing characteristics during the working process,the suction bucket is required to bear the uplift force of floating structures.Its bearing characteristics are related to the geometrical size of the suction bucket,the strength of the soil layer,the load characteristics and other factors.The bearing characteristics of suction bucket foundations under inclined loads under different aspect ratios and strength distributions are studied based on the finite element method.The relationship among vertical,horizontal bearing capacity coefficient and diameter ratio(L/D)and heterogeneity coefficient of soils K is established.The relevant method is also given.The envelope of vertical load(V)and horizontal load(H)is established,and the method for calculating the bearing capacity under the V-H combination is finally exhibited.The research results may provide a basis for the design of anti-pull-out foundation of marine floating structures.