| 冻土区坡体蠕滑作用下管道应力数值计算 |
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| 引用本文： | 张羽翀,李龙,黄鑫,张姝慧.冻土区坡体蠕滑作用下管道应力数值计算[J].油气储运,2021(2):185-191. |
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| 作者姓名： | 张羽翀 李龙 黄鑫 张姝慧 |
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| 作者单位： | 国家管网集团西部管道公司兰州输气分公司 |
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| 摘 要： | 长输油气管道在一般地段埋地敷设,当经过季节性斜坡冻土区时,由于冻融引起的坡体蠕滑作用导致管道产生附加应力。通过安装管道轴向应变传感器可监测坡体蠕滑作用导致的管道轴向应力变化,但开展管道强度评价时,需要明确管道应变监测初始应力,由于应力检测技术多在实验室环境下使用,工程上并不成熟,目前行业内一般通过有限元建模计算方法获取管道应变监测初始应力。以涩宁兰一线某穿越斜坡季节性冻土地貌埋地管道为例,介绍了位于季节性冻土区的管道当前面临的主要风险、土体位移分布形式与位移的确定,以及季节性冻土区斜坡体位移作用下管道的受力和变形情况。采用向量式有限元方法,利用空间梁单元和非线性土弹簧模型对灾害点管道进行了数值模拟,并得到管道现状应力分布,为确定管道本体应变监测截面位置、估计管道现状应力分布及管道安全评价提供依据。
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| 关 键 词： | 季节性冻土区 管道位移 模型计算 应力分析 |
Stress numerical calculation of pipeline subjected to slope creep in frost area |
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| ZHANG Yuchong,LI Long,HUANG Xin,ZHANG Shuhui.Stress numerical calculation of pipeline subjected to slope creep in frost area[J].Oil & Gas Storage and Transportation,2021(2):185-191. |
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| Authors: | ZHANG Yuchong LI Long HUANG Xin ZHANG Shuhui |
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| Institution: | (PipeChina Western Pipeline Company Lanzhou Branch) |
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| Abstract: | Long-distance pipeline is buried in the ordinary section, and for the pipeline passing through the seasonal frost area with slope, additional stress is applied due to the slope creep caused by freezing and thawing. The axial stress change of pipeline resulted from the slope creep can be monitored by the axial strain sensors installed along the pipeline. However, for the strength evaluation of pipeline, the initial stress of pipeline strain monitoring should be clear. For the stress detection technology mostly used in laboratory environment is not mature in engineering, the initial stress of pipeline strain monitoring can only be obtained by the calculation method of finite element modeling. Taking the buried section of SebeiXining-Lanzhou Pipeline I crossing the seasonal slope frost area as an example, the current major risks of pipeline in the seasonal frost area, distribution and determination of soil displacement, and the stress and deformation of the pipeline in seasonal frost area due to slope creep were introduced. By using the Vector Form Intrinsic Finite Element(VFIFE) method, the numerical simulation of pipeline at hazard point was conducted with space beam element and nonlinear soil spring model, and the stress distribution of the pipeline was obtained, which provides basis for determination of the cross-sectional location of strain monitoring, estimate of current stress distribution and safety assessment of pipeline. |
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| Keywords: | seasonal frost area pipeline displacement model calculation stress analysis |
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