海底管道水动力和在位稳定性研究的近代进展

海洋工程中海底管道为保证其正常运行和结构生存期的安全,直接与海底管道水动力和在位稳定性研究密切相关的。本文着重叙述了70年代、80年代国外对接近于海底、部分埋入海底和海底敞口浅沟内管道的水动力和在位稳定性方面的研究结果,并就进一步开展这方面研究进行讨论。     

High-order lateral buckling analysis of submarine pipeline under thermal stress

It is of importance to study and predict the possible buckling of submarine pipeline under thermal stress in pipeline design.Since soil resistance is not strong enough to restrain the large deformation of pipeline,high-order buckling modes occur very easily.Analytical solutions to high-order buckling modes were obtained in this paper.The relationships between buckling temperature and the amplitude or the wavelength of buckling modes were established.Analytical solutions were obtained to predict the occurrence and consequence of in-service buckling of a heated pipeline in an oil field.The effects of temperature difference and properties of subsoil on buckling modes were investigated.The results show that buckling will occur once temperature difference exceeds safe temperature;high-order pipeline buckling occurs very easily;the larger the friction coefficients are,the safer the submarine pipeline will be.