Stress analysis on large-diameter buried gas pipelines under catastrophic landslides

Abstract

This paper presents a method for analysis of stress and strain of gas pipelines under the effect of horizontal catastrophic landslides. A soil spring model was used to analyze the nonlinear characteristics concerning the mutual effects between the pipeline and the soil. The Ramberg-Osgood model was used to describe the constitutive relations of pipeline materials. This paper also constructed a finite element analysis model using ABAQUS finite element software and studied the distribution of the maximum stress and strain of the pipeline and the axial stress and strain along the pipeline by referencing some typical accident cases. The calculation results indicated that the maximum stress and strain increased gradually with the displacement of landslide. The limit values of pipeline axial stress strain appeared at the junction of the landslide area and non-landslide area. The stress failure criterion was relatively more conservative than the strain failure criterion. The research results of this paper may be used as a technical reference concerning the design and safety management of large-diameter gas pipelines under the effects of catastrophic landslides.

A Finite Element Model for Monitoring the Displacement of Pipelines in Landslide Regions by Discrete FBG Strain Sensors

“…In a future work, it would be interesting to optimize the distribution of the sensors along the pipeline using, for example, direct finite element simulations to estimate the strain distribution caused by assumed landslides [29,30].…”

Quantitative Estimation of Pipeline Slope Disaster Risk in China

“…The interaction simulation (Kunert et al 2012) can simulate the nonlinearity of the pipe-soil material, the nonlinear contact of the pipe-soil interface, and the large deformation of the pipe. The slope of the model is a free boundary, the bottom is fixed, and normal constraints are applied around it (Zhang et al 2017;Zhang et al 2018).…”

Detection and Numerical Simulation of Potential Hazard in Oil Pipeline Areas Based on UAV Surveys

“…Due to the limitations of finite element software in the establishment of complex three-dimensional models, this research uses the three-dimensional modeling software Rhino to process the DTM data with a precision of 2 m obtained by the UAV, establish a three-dimensional model similar to the real terrain, and import the finite element software Abaqus perform subsequent calculation and analysis. In order to facilitate the calculation and convergence, this study temporarily ignores the ups and downs of the pipeline laying with the change of terrain, and simplified the pipeline to a straight pipe model, so the buried depth of the pipeline is 0.5-2.5 m. The established slope finite element model range is 145 × 115 × 90 m, and the boundary conditions are set for the model (the bottom boundary is fixed, and the front, back, left, and right sides are restricted normal displacements) (Zhang et al, 2017(Zhang et al, , 2018, material parameters (Tables 2, 3), and apply gravity load. Subsequently, by continuously reducing the cohesive force and internal friction angle of the unstable slope area, the slope gradually developed to the limit equilibrium state.…”