海底管线整体屈曲过程中土体水平向阻力模型研究
发布时间：2018-12-31 11:18
【摘要】：高温、高压作用下不埋或浅埋的海底管线较易发生水平向整体屈曲,土体对管线的阻力决定了管线的变形形态及变形后的应力状态,因此,确定管线受到的土体阻力对准确地分析管线的整体屈曲有重要意义。开展了基于渤海砂性土体的系列室内模型试验,测定了不同埋深条件下管线受到的土体阻力,建立了随埋深条件而变化的土体动态阻力模型,揭示了埋深对土体阻力峰值和最终稳定值的影响。由于ABAQUS内置的罚函数接触模型无法实现管-土界面的动态摩擦特性,开发了子程序VFRIC,在管线温-压联合作用下的整体屈曲分析中成功引入了建立的土体动态阻力模型,实现了土体阻力大小与管线位移相关的动态接触特性模拟,从而较为真实地反映了管线整体屈曲过程中受到的土体阻力变化过程。研究表明,不同土体阻力模型对管线整体屈曲分析结果影响显著,在动态阻力模型中由于土体阻力存在峰值和衰减过程,因此计算得到的管线整体屈曲临界轴力明显提高,管线屈曲变形更为集中,最大弯矩和应变也相应增大。
[Abstract]:Under the action of high temperature and high pressure, undersea pipelines without burying or shallow burying are prone to overall horizontal buckling. The resistance of soil to pipelines determines the deformation pattern and stress state of pipelines after deformation. It is important to determine the soil resistance of pipeline to accurately analyze the overall buckling of pipeline. A series of laboratory model tests based on sand soil in Bohai Sea were carried out. The soil resistance of pipeline under different buried depth was measured, and the dynamic resistance model of soil was established with the change of buried depth. The influence of buried depth on the peak value of soil resistance and ultimate stability is revealed. Because the dynamic friction characteristics of pipe-soil interface can not be realized by the penalty function contact model built in ABAQUS, the dynamic resistance model of soil is successfully introduced into the whole buckling analysis of the subroutine VFRIC, under the combined action of pipeline temperature and pressure. The dynamic contact characteristics of soil resistance and pipeline displacement are simulated, which reflects the variation process of soil resistance in the whole buckling process of pipeline. The results show that different soil resistance models have a significant effect on the overall buckling analysis results of pipeline. In dynamic resistance model, due to the peak and attenuation process of soil resistance, the calculated critical axial force of overall buckling of pipeline is obviously increased. The buckling deformation of the pipeline is more concentrated and the maximum bending moment and strain increase accordingly.
【作者单位】： 天津大学水利工程仿真与安全国家重点试验室;中交天津港湾工程研究院有限公司;
【基金】：国家重点基础研究发展计划(No.2014CB046800) 国家自然科学基金优秀青年基金(No.51322904) 高等学校博士学科点专项科研基金资助课题(No.2013032110074)
【分类号】：P756.2;TU43
本文编号：2396495
[Abstract]:Under the action of high temperature and high pressure, undersea pipelines without burying or shallow burying are prone to overall horizontal buckling. The resistance of soil to pipelines determines the deformation pattern and stress state of pipelines after deformation. It is important to determine the soil resistance of pipeline to accurately analyze the overall buckling of pipeline. A series of laboratory model tests based on sand soil in Bohai Sea were carried out. The soil resistance of pipeline under different buried depth was measured, and the dynamic resistance model of soil was established with the change of buried depth. The influence of buried depth on the peak value of soil resistance and ultimate stability is revealed. Because the dynamic friction characteristics of pipe-soil interface can not be realized by the penalty function contact model built in ABAQUS, the dynamic resistance model of soil is successfully introduced into the whole buckling analysis of the subroutine VFRIC, under the combined action of pipeline temperature and pressure. The dynamic contact characteristics of soil resistance and pipeline displacement are simulated, which reflects the variation process of soil resistance in the whole buckling process of pipeline. The results show that different soil resistance models have a significant effect on the overall buckling analysis results of pipeline. In dynamic resistance model, due to the peak and attenuation process of soil resistance, the calculated critical axial force of overall buckling of pipeline is obviously increased. The buckling deformation of the pipeline is more concentrated and the maximum bending moment and strain increase accordingly.
【作者单位】： 天津大学水利工程仿真与安全国家重点试验室;中交天津港湾工程研究院有限公司;
【基金】：国家重点基础研究发展计划(No.2014CB046800) 国家自然科学基金优秀青年基金(No.51322904) 高等学校博士学科点专项科研基金资助课题(No.2013032110074)
【分类号】：P756.2;TU43
【共引文献】
相关博士学位论文 前2条
1 朱晓林;地下换热器热形变及其失效性研究[D];吉林大学;2014年
2 施若苇;海底管道热屈曲及管土相互作用研究[D];浙江大学;2014年
相关硕士学位论文 前3条
1 李彪;海底管线水平向整体屈曲低阶模态研究[D];天津大学;2012年
2 王秀妍;温压联合作用下海底管线水平向整体屈曲的高阶模态分析[D];天津大学;2013年
3 熊昊;海底管线水平向整体屈曲数值模拟研究[D];天津大学;2014年
，本文编号：2396495
本文链接：https://www.wllwen.com/guanlilunwen/chengjian/2396495.html
