| 近底床悬跨海管安全跨长的预测 |
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| 引用本文： | 李磊,曹玉龙,林缅. 近底床悬跨海管安全跨长的预测[J]. 中国石油大学学报(自然科学版), 2010, 34(2). DOI: 10.3969/j.issn.1673-5005.2010.02.024 |
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| 作者姓名： | 李磊 曹玉龙 林缅 |
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| 作者单位： | 中国科学院,力学研究所环境力学重点实验室,北京,100190 |
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| 基金项目： | 国家"863"目标导向项目，国家自然科学基金，中国科学院知识创新工程重要方向性项目 |
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| 摘 要： | 由修正势流理论获得了海管沿轴向升力分布,运用海管的小挠度微分方程,通过有限元计算得到有混凝土配重海管的平衡位移和应力,分析跨肩约束、混凝土刚度和来流速度对最大位移和最大应力的影响,讨论悬跨长度增加时刚度失效和强度失效的行为规律,给出不同跨肩约束条件下随间隙比和来流速度变化的安全跨长分区图.结果表明:悬跨海管首先出现刚度失效,触底后则会发生强度失效;间隙比和跨肩约束是影响安全跨长的重要因素;来流速度小时,必须考虑海管的静态临界安全跨长.
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| 关 键 词： | 悬跨海管 修正势流法 升力系数 安全跨长 分区图 |
Prediction on safety length of free spanning pipeline near seabed |
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| LI Lei,CAO Yu-long,LIN Mian. Prediction on safety length of free spanning pipeline near seabed[J]. Journal of China University of Petroleum (Edition of Natural Sciences), 2010, 34(2). DOI: 10.3969/j.issn.1673-5005.2010.02.024 |
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| Authors: | LI Lei CAO Yu-long LIN Mian |
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| Affiliation: | LI Lei,CAO Yu-long,LIN Mian(Key Laboratory of Environment Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China) |
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| Abstract: | Applying the lift force distribution along a free spanning pipeline near seabed obtained by the modified potential method,the displacements and stresses of the pipeline with steel-concrete structure were investigated by the pipe dynamics equation.Using the finite element analysis and iterative method,the effects of concrete stiffness,constraints in span shoulders and current velocity on the maximal displacement and stress were analyzed.The stiffness failure and strength failure were discussed when the spann... |
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| Keywords: | free spanning pipeline modified potential method lift coefficient safety length partition diagram |
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