基于极限平衡法的单桶多隔舱结构防波堤稳定性分析

Stability analysis of the breakwater with multi-compartment single-bucket structure based on the limit equilibrium method

借助ABAQUS软件,采用拟静力法分析结构在水平力下的运动模式及作用于基础桶土压力随水平荷载增加的变化规律。结果表明,结构在水平力作用下绕某点转动,转动中心随荷载增大而改变,极限状态下处于结构中轴线位置;作用于基础桶的土压力可分为主动、静止和被动3个区域。在此基础上,推导了适用于该结构稳定性分析的极限平衡法,鉴于其部分假定导致一定的误差,相比于数值模拟结果,极限平衡法计算值平均偏大20%~25%,但2种方法得到的抗倾覆安全系数随土性、结构参数变化发展趋势基本一致。

The breakwater with multi-compartment single-bucket structure is a new type of structure applied in soft foundations.To explore the stress characteristics of multi-compartment single-bucket structure breakwater under horizontal loading is of great importance in its stability analysis.In this study,quasi-static force is adopted to analyze the motion mode and the earth pressure development acting on the structure as horizontal load increases.The results show that the structure rotates around a point below its foundation base under the acting of horizontal force.The rotation center moves to the axis position of the structure when reaching limit state.Meanwhile,earth pressures on the foundation bucket can be divided into active pressure,passive pressure and static pressure.On the basis of above conclusions,the limit equilibrium method is derived to analyze its stability.In addition,comparison of the anti-overturning safety factor between critical equilibrium method and finite element calculation shows that the difference between two data sets is about 20%-25%,because of their different assumptions.Theoretical results are larger and the parametric changing tendency in limit equilibrium method agrees well with that of numerical simulation,which provides some reference data for theoretical design system of breakwater with multi-compartment single-bucket structure.