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海洋工程中结构物除了受到自身重力作用外,往往还受到海风、海浪、海流等的作用,使得海床土体中的基础一般受到集中力、弯矩和扭矩的联合作用,这一受力状态称为结构物基础的复合加载模式。详细研究复合加载模式下海床土体的失稳模式和极限承载能力,对海洋结构物的安全运行至关重要。以三维空间内圆形基础为研究对象,基于土体弹塑性极限平衡原理,利用非线性有限元分析软件ABAQUS,对空间六自由度圆形基础极限承载能力进行详细的数值分析。基于上述计算分析结果,揭示了单调加载情况下土体的失稳机理与极限承载能力,给出了复合加载模式下海床土体破坏包络面方程。给出的土体失稳模式和破坏包络面方程能够合理地评估复合加载模式下海床土体的极限承载能力。
In addition to its own gravity in the marine engineering structure, often by the sea breeze, waves, currents and other effects, making the foundation of the seabed soil generally by the combined force, bending moment and torque, the force state Complex loading mode called structure basis. It is very important for the safe operation of marine structures to study in detail the instability mode and ultimate bearing capacity of seabed soils under composite loading mode. Taking the circular foundation in three-dimensional space as the research object and the finite element analysis software ABAQUS, the ultimate bearing capacity of circular six-DOF circular foundation is analyzed numerically based on the elastoplastic limit equilibrium principle. Based on the above calculation and analysis results, the instability mechanism and ultimate bearing capacity of soil under monotonic loading are revealed, and the equation of failure surface of the soil under the composite loading is given. Given the failure mode of soil and the equation of failure envelope, the ultimate bearing capacity of seabed soils under composite loading can be reasonably evaluated.