Modelling and analysing failure modes of buried pipelines perpendicularly crossing landslide boundaries

Li, Haojie; Zhu, Hong‐Hu; Zhang, Chun-Xin; Zhang, Wei

doi:10.1016/j.soildyn.2022.107447

Cited by 5 publications

(3 citation statements)

References 32 publications

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“…2 With population growth and economic development, energy demand continues to increase, and pipeline construction has been developing rapidly. 3 Pipelines traverse different topographic areas during the laying process as Figure 1, especially in geological disaster-prone areas, where soil movements such as landslides, earthquakes, faults, permafrost and subsidence put the pipelines in a complex loading state, posing a greater threat to the safe use of pipelines. 4 Among them, landslide is one of the common geological disasters affecting the safety of pipelines.…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of pipelines with corrosion defects under landslide

Hu,

Lu,

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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As the total mileage of the pipeline and the years of operation are increasing, the threat of landslide and corrosion defects to the safety of pipeline operation is also increasing. In this paper, based on the nonlinear elastoplastic theory, a pipe-soil coupling model is established to determine the maximum stress location of the pipeline containing corrosion defects under the action of landslide, on the basis of this location, the internal pressure of pipeline operation and the factors such as landslide width and landslide displacement are analyzed. Through multivariate linear regression, the equation of the maximum stress of the pipeline with the change of landslide width and displacement is fitted. The results show that in the landslide area, the operating pressure has less influence on the safety of the pipeline and the existence of corrosion defects will lead to sudden stress changes here, which will lead to the perforation of the pipeline; with the increase of the landslide width and landslide displacement, the plastic deformation area will appear in the middle of the pipeline, which means that the pipeline in this area is prone to bending, rupture and flattening and other failures, and the safety of the pipeline has a greater risk. In the non-slippery area, the maximum stress of the pipeline will increase with the increase of operating pressure, landslide width, and landslide displacement. Through multiple linear regression, the correlation coefficients of fitting the maximum stress of the pipeline with the expressions of landslide width and displacement are 0.959 and 0.996 respectively to prove the reliability of the formula.

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Section: Introductionmentioning

confidence: 99%

Failure analysis of pipelines with corrosion defects under landslide

Hu,

Lu,

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…A uniform landslide force load was conventionally employed for simplification, and this approach has gradually transitioned to a force distribution modeled by parabolic curves [17], further evolving into a more realistic fourth-power parabolic curve of the displacement [18]. Building upon the displacement load distribution of the fourth-power parabolic curve, Li et al [19] investigated the strain distribution in transverse pipelines subjected to tensile and compressive stress caused by landslides. This led to the introduction of a criterion for pipeline failure based on relative stiffness.…”

Section: Introductionmentioning

confidence: 99%

“…The pipeline has a burial depth of 1 m, an internal pressure of 10 MPa, a non-landslide soil width of 25 m, and an initial crack located at 3 m. The detailed properties of the pipeline and soil are presented in Tables 1 and 2. The soil's constitutive model utilizes the Coulomb-Mohr model [19], while the pipeline material is based on stress-strain data from relevant research [39]. To ensure nonlinear contact between the pipeline and soil, a face-to-face contact approach is adopted [40], a hard contact is used in the normal direction, while a penalty method is applied in the tangential direction, and the friction coefficient between the soil and the pipeline can be set at 0.4.…”

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confidence: 99%

Safety Analysis and Condition Assessment of Corroded Energy Pipelines under Landslide Disasters

Zhang,

Liu,

Liu

et al. 2023

Applied Sciences

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Corrosion poses a significant risk to the safety of energy pipelines, while landslide disasters emerge as the primary threat responsible for triggering pipeline failures across mountainous areas. To date, there is limited research focused on the safety of energy pipelines considering the synergistic effect of corrosion and landslides. The present study proposes a finite element (FE)-based model to assess the condition of corroded pipelines under landslides. The effects of corrosion dimensions (length and depth) and location are determined. A novel equation is finally developed to predict the maximum stress and determine the most disadvantageous position for corroded pipelines under various landslide displacements. The results demonstrate that (1) as the landslide progresses, the pipeline’s stress significantly increases; (2) corrosion depth has a more significant impact on the pipeline condition than the corrosion length, and it is positively correlated with the pipe’s stress; (3) the maximum stress exhibits a nonlinear relationship with the landslide-facing position and the corrosion circumferential location; and (4) when the axial position of the corrosion is more than 6.5 m away from the center of the landslide, the location of maximum stress shifts from the corrosion region to the central section of the pipeline within the landslide. This work contributes to helping pipeline owners to understand the applicability of energy pipelines subjected to the combined effects of corrosion and landslides and provides support for future risk assessment efforts in pipeline integrity management.

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