【作者】 田辰；

【导师】 胡云昌；

【作者基本信息】 天津大学 ， 船舶与海洋结构物设计制造， 2004， 硕士

【摘要】 随着世界海洋石油工业的迅猛发展，海底管线在近海石油、天然气开采中得到了广泛的应用，其原因在于海底管线具有输送连续、输送量大、管理方便、稳定安全等一系列优点。海底管线所处环境极其复杂，其破损将造成开采工作停滞，且海底管线的维修周期较长、维修费用很高，一旦破损将造成严重的经济损失；海底管线破损导致的油气泄漏还会严重地污染环境。因此，海底管线破损已经引起了国内外学者的高度重视，并成为研究的热点问题。铺设在海底的油气管线，在波和流的往复作用下，都有可能被冲刷而形成悬跨。海底管线的悬跨由于没有土壤支撑，很容易在尾流旋涡的作用下产生疲劳破坏。本文研究了在波流联合作用的海洋条件下，海底管线悬跨在流作用下的疲劳寿命评估方法，并根据 Miner 线性累计损伤理论和 DNV RP－F105 中的评估模型进行海底管线疲劳寿命的计算。文章结尾对东方 1-1 的 12″气输管线进行了数值试验计算，并讨论了各参数对疲劳寿命计算结果的影响。更多还原

【Abstract】 With the rapid development of the offshore oil industry, subsea pipelines arewidely used in offshore oil and gas exploitation thanks to many advantages, such ascontinuous transportation, big transporting quantity, convenient management, andsafety. Due to the highly complex environmental conditions under which subseapipelines are, the damage to pipelines will lead to suspension of exploitation andsevere economic loss because of the long period and high cost for repair. At the sametime, the leakage of oil and gas caused by damage will result in the seriousenvironmental pollution. So damage to subsea pipelines has attract the attention ofdomestic and international researchers and become one of academic hot issues allover the world. Free spans will occur due to the fact that subsea pipelines are scoured by waveand current and easily be destroyed by fatigue effect without the support of soil. This paper studied the assessment method for fatigue life of subsea pipelinesaffected by current under the combined wave and current condition, and worked outthe calculating process of subsea pipeline fatigue life based on Miner linear damagecumulating theory and assessment model in DNV RP－F105. Numeric experiments based on the 12″interfiled pipeline of DF1-1 GAS LINEare made by using method established, the effects of parameters on fatigue life arealso specified.更多还原