Limit displacement of a landslide for an X80 buried pipeline crossing it
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摘要: 长输管道在运输天然气时不可避免地会穿越地质灾害频发区域，其中滑坡对于管道的威胁性最大，因此对滑坡作用下管道的安全进行评估十分重要。针对X80管道横穿滑坡可能遇到的安全问题，提出管道的极限滑坡位移定义，将其作为评价管道安全的外部指标。依据中贵线某滑坡工况，采用ABAQUS软件建立横穿滑坡下的管-土模型，对不同滑坡裂缝、滑坡宽度下的管道力学行为与极限滑坡位移变化情况进行数值模拟研究。结果表明：不同裂缝位置、滑坡宽度下，管道应力均随位移荷载增加而增大；滑坡裂缝位置距管道越远，管道承受的极限滑坡位移值越大，当裂缝位置为9 m时，管道所能承受的极限滑坡位移达4.03 m；文中工况下滑坡宽度35 m为管道应力变化分界点，此时管道所能承受的极限滑坡位移值最小。Abstract: When transporting natural gas, long-distance pipelines will inevitably pass through areas with frequent geological disasters, and landslides are the most threatening to pipelines. Therefore, it is very important to study the safety assessment of pipelines under the action of landslides. In view of the possible safety problems of X80 pipeline crossing the landslide, the definition of the limit landslide displacement of the pipeline is proposed as an external index to evaluate the safety of the pipeline. According to the working condition of a landslide on the Zhongwei Guiyang line, the pipe soil model under the landslide is established by using ABAQUS software, and the mechanical behavior of the pipeline and the change of the limit landslide displacement under different landslide cracks and landslide widths are numerically simulated. The results show that the pipeline stress increases with the increase of displacement load under different crack positions and landslide widths; The farther the landslide crack location is from the pipeline, the greater the limit landslide displacement that the pipeline can bear. When the crack location is 9 m, the limit landslide displacement that the pipeline can bear reaches 4.03 m; Under the working condition of this paper, the landslide width of 35 m is the dividing point of pipeline stress change. At this time, the limit landslide displacement that the pipeline can withstand is the smallest.
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Key words:
- lateral landslide /
- X80 pipeline /
- landslide crack /
- landslide width /
- limit displacement
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图 3 不同层数管道应力分布图
Figure 3. Stress distribution diagram of pipelines with different layers
图 4 网格细化管道应力对比图
Figure 4. Comparison diagram of pipe stress before and after mesh refinement
图 6 不同裂缝位置下管道的极限滑坡位移、最大位移和土体最大位移变化曲线
Figure 6. Variation curves of limit landslide displacement, maximum displacement and maximum displacement of soil mass of pipeline under different crack positions
图 7 不同裂缝位置与位移荷载下管道的应力曲线图
注：图7从左到右分别为裂缝位置距管道0～9 m时的曲线。
Figure 7. Stress curve of pipeline under different crack positions and displacement loads
图 8 不同裂缝位置与位移荷载下管道的位移曲线图
注：图8从左到右分别为裂缝位置距管道0～9 m时的曲线。
Figure 8. Displacement curve of pipeline under different crack positions and displacement loads
图 9 不同滑坡宽度下管道的极限滑坡位移、管道最大位移与土体最大位移曲线
Figure 9. Curves of limit landslide displacement, maximum pipeline displacement and maximum soil displacement of pipelines with different landslide widths
图 10 滑坡宽度10～30 m的管道应力变化曲线
Figure 10. Pipeline stress change curve with landslide width of 10～30 m
图 11 滑坡宽度35～80 m的管道应力变化曲线
Figure 11. Pipeline stress change curve with landslide width of 35～80 m
表 1 土体参数
Table 1. Soil parameters
岩土参数 E/MPa µ γ/（kN·m−3） φ/（°） c/kPa 非滑坡区域 32.5 0.35 20 25 20 滑坡区域 32.5 0.40 20 10 15 注：E为弹性模量，µ为泊松比，γ为容重，φ为摩擦角，c为黏聚力。 
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表 2 管材参数
Table 2. X80 pipe parameters
型号 外径/mm 壁厚/mm 密度/（kg·m−3） E/GPa µ σ/MPa X80 1016 18.2 7850 207 0.3 555 注：σ为屈服应力。
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表 4 滑坡宽度小于30 m的模型检验
Table 4. Model test of landslide width less than 30 m
模型 R R2 决定系数 均方差 卡方检验系数 F检验 检验值 0.9857 0.9716 0.9364 31.45 141.43 144.76
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表 5 滑坡宽度大于30 m的模型检验
Table 5. Model test of landslide width more than 30 m
模型 R R2 决定系数 均方差 卡方检验系数 F检验 检验值 0.9811 0.9626 0.9259 26.64 224.24 490.04
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