中文摘要：

为研究深水s型铺管收弃管（A／R）作业过程管道的形态与受力特性，运用刚悬链线理论建立管道静平衡微分方程，结合缆索受力与铺管船移动，给出迭代求解两阶段作业过程管道与缆索形态的数值计算方法，并开发收弃管作业计算分析程序，模拟2000m水深弃管操作过程．结果表明，第1阶段，铺管船需要向前移动，以使A／R绞车施加的张力保持不变，管道形态变得平缓，管道内张力逐步增加而弯矩减小；第2阶段，铺管船静止，A／R绞车施加的张力需要逐步减小，管道形态变陡，管道内张力减小而弯矩迅速增加．与铺管专业软件0FFPIPE计算得到的结果吻合较好，验证了计算分析程序的有效性和实用性，从而可为实际深水管道铺设设计提供理论依据．

英文摘要：

To investigate the configurations and force characteristics of deepwater S-lay pipeline during a- bandonment and recovery （A/R） operation, the stiffened catenary theory was applied to establish the stat- ic equilibrium governing differential equation of a pipe element, combined with the mechanical analysis of cable and the movement of pipelay vessel, then numerical solution method was derived for the configura- tion of pipeline and cable during two stages of A/R operation, and the corresponding program was devel- oped to carry out the numerical simulation on the abandonment process of offshore pipeline in 2 000 m wa- ter depth. The results show that in the first stage, the pipelay vessel has to move ahead so that the tension of A/R winch keeps invariable, along with the configuration of pipeline becoming flat gradually, the ten- sion of the pipe increases whereas the bending moment decreases. In the second stage, the pipelay vessel maintains motionless, and the tension of A/R winch need decrease step by step; the configuration of off- shore pipeline becomes increasingly steep along with the pipeline continuously being lowered, thus the ten- sion of the pipe decreases whereas the bending moment increases rapidly. The results are compared with the ones obtained by the OFFPIPE software, and close agreement further demonstrates the effectiveness and practicality of this calculating program, which can offer the theoretical basis for the laying design of deepwater pipeline in the practical engineering.