论文部分内容阅读
基于ANSYS/LS-DYNA动力学分析软件,采用非线性动力有限元法,对坠物撞击海底管道的过程进行数值仿真。通过大量的数值模拟得出:相同坠落物能量的情况下,悬空管道的凹陷损伤深度与裸露管道的相比偏小,且随着坠落物能量的增加,其差值增大;随着坠落物速度、坠落物质量的增大,管道撞击部位凹陷变形加剧,海底管道悬空段的最大振动幅值增大;相同坠落物能量的情况下,坠落物与悬空管道的接触面积越小,悬空管道的损伤深度越大;海床土体参数(剪切弹性模量、内摩擦角、密度)的变化对悬空管道的凹陷损伤深度及悬空段的最大振动幅值的影响较小。
Based on ANSYS / LS-DYNA dynamic analysis software, nonlinear dynamic finite element method was used to simulate the process of falling objects striking submarine pipelines. Through a large number of numerical simulations, the damage depth of suspended pipeline is smaller than that of exposed pipeline under the same falling energy, and the difference increases with the falling energy. With the falling object Speed, the mass of falling objects, the deforming of sag in the pipe collision area aggravate, and the maximum vibration amplitude of the suspended section of the submarine pipe increases; in the case of the same falling object energy, the contact area of the falling object and the suspended pipe is smaller, The greater the damage depth, the less the influence of the soil parameters (shear modulus, internal friction angle, density) on the sag depth of the suspended pipeline and the maximum vibration amplitude of the suspended section.