中文摘要：

文中利用奇异摄动理论得到了深海管道S-1ay铺设过程中的构型解析解，并研究了不同张紧力、水深以及海流力对管道构型及弯矩的影响．同时，采用有限元法对深海大直径管道铺设过程进行了数值仿真，并与奇异摄动解进行了对比和验证．理论结果表明：其他参数相同时，适当增大张紧力可使管道构型更平缓，对铺管有利；海水越深，管道的构型越陡，靠近海底处管道的弯矩峰值越大，对铺管不利；当管道受到与铺设方向相反的海流力时，海流力越大，靠近海底部管道弯矩的峰值越大，对铺管越不利．

英文摘要：

In this paper, the analytical solution of the pipeline during ultra-deep S-lay installation was obtained based on the theory of singular perturbation. Then, the effects of tension, water depth and current force on the pipeline＇s configuration and bending moment were investigated. Moreover, a numerical simulation of the pipeline installation was conducted by means of the finite element method, and the results were compared with the theoreti- cal singular perturbation solution. Theoretical resuhs show that （ 1 ） a suitable increase in tension is good for the