| China Geological Environment Monitoring Institute, China Geological Disaster Prevention Engineering Industry Association | Host |
| Citation: |
ZHANG Peng, WANG Xiaoyu, TANG Xuemei, LIU Siming. Limit displacement of a landslide for an X80 buried pipeline crossing it[J]. The Chinese Journal of Geological Hazard and Control, 2023, 34(2): 21-29. doi: 10.16031/j.cnki.issn.1003-8035.202207021
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Limit displacement of a landslide for an X80 buried pipeline crossing it
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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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Keywords:
- lateral landslide /
- X80 pipeline /
- landslide crack /
- landslide width /
- limit displacement
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References
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ZHANG Peng, WANG Xiaoyu, TANG Xuemei, LIU Siming. Limit displacement of a landslide for an X80 buried pipeline crossing it[J]. The Chinese Journal of Geological Hazard and Control, 2023, 34(2): 21-29. doi: 10.16031/j.cnki.issn.1003-8035.202207021
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Figure 1.
Landslide panorama
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Figure 2.
Displacement cloud diagram of rear soil mass at 10 m
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Figure 3.
Stress distribution diagram of pipelines with different layers
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Figure 4.
Comparison diagram of pipe stress before and after mesh refinement
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Figure 5.
Schematic diagram of grid division
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Figure 6.
Variation curves of limit landslide displacement, maximum displacement and maximum displacement of soil mass of pipeline under different crack positions
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Figure 7.
Stress curve of pipeline under different crack positions and displacement loads
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Figure 8.
Displacement curve of pipeline under different crack positions and displacement loads
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Figure 9.
Curves of limit landslide displacement, maximum pipeline displacement and maximum soil displacement of pipelines with different landslide widths
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Figure 10.
Pipeline stress change curve with landslide width of 10～30 m
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Figure 11.
Pipeline stress change curve with landslide width of 35～80 m