海底裸置与埋置管线自沉过程对比研究  

Comparative study of the bare and buried submarine pipeline sinkings

作　　者：唐丕鑫 杨树耕[1] 宋艾恒 刘晓峰[1] 徐蒙[1] 王晗[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072 [2]上海外高桥造船海洋工程有限公司,上海200306

出　　处：《海洋工程》2015年第2期89-96,共8页The Ocean Engineering

基　　金：国家重点基础研究发展计划(973)资助项目(2014CB046802)

摘　　要：海底管线是海洋油气输运系统的重要组成成分,其稳定性和安全性尤为重要。通过有限元软件ABAQUS,应用Mohr-Coulomb模型,模拟海底裸置与埋置管线自沉过程。通过平衡初始地应力,设置管土接触,考虑重力和浮力作用,进行土体固结分析,计算裸置与埋置管线的土体与管线竖直位移,并进行管线悬跨研究。计算结果显示,对于裸置管线,参数的改变使土体更容易发生塑性屈服,土体的竖直位移量更大;对于埋置管线,当管线埋深较浅、管线上方土体重量不大时,参数的改变使管线平均密度与周围土体密度相差越大土体越容易发生塑性屈服,土体的竖直位移量越大。当管线悬空时,悬跨长度过大易使管线两端支撑土体被压溃,管线易产生大变形而失稳,因此在管线安装与维护过程中,一定要采取措施降低悬跨长度,保证管线运营安全。Submarine pipeline is an important component of the offshore oil and gas transportation system,and its stability and safety is particularly important. By use of finite element software ABAQUS,the Mohr-Coulomb plastic model was established to simulate the bare and buried submarine pipeline sinking processes. Through balancing the soil in-situ stress,setting the pipe-soil contact,applying the weight and buoyancy,and analyzing soil consolidation,the vertical displacement of the pipeline and soil is calculated. The calculation results show that for bare pipeline,parameter changes can make the soil more prone to plastic yield,and the soil vertical displacement bigger; for buried pipeline,when the pipeline is buried shallowly and the soil at the top of the pipeline weighs light,parameter changes can make the difference of the pipeline and soil density bigger,soil more prone to plastic yield,and the soil vertical displacement bigger. In the state of suspended pipeline,when span length is too large,the supporting soil is easy to collapse,and pipeline deformation will be too large and lead to loss of stability. Therefore in the pipeline installation and maintenance process,we must take measures to reduce the span length to ensure the safe operation of pipeline.

关 键 词：海底管线 ABAQUS 自沉过程 竖直位移 悬跨 海洋油气 输运系统 

分 类 号：TE88[石油与天然气工程—油气储运工程]