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.
Highlights
Landslides are a common geological disaster frequently occurring in mountainous areas of the southwest provinces, the Loess Plateau in the northwest, as well as mountainous and hilly areas of the mid-south and southeast provinces in China
This paper presents a method for analysis of stress and strain of gas pipelines under the effect of horizontal catastrophic landslides
When the landslide displacement increases from 0.1 m to 0.8 m, the tensile stress increases from 312 MPa to 663 MPa, the tensile strain increases from 0.14% to 1.63%, the compressive stress increases from 240 MPa to 566 MPa and the compressive strain increases from 0.13% to 1.27%
Summary
Landslides are a common geological disaster frequently occurring in mountainous areas of the southwest provinces, the Loess Plateau in the northwest, as well as mountainous and hilly areas of the mid-south and southeast provinces in China. It is necessary to make a stress analysis on large-diameter buried gas pipelines under the effects of catastrophic landslides. Studies of the stress condition of buried pipelines under the effects of catastrophic landslides are rarely made. Aiming at the working conditions of buried gas pipelines with large diameters, the authors created a soil spring analysis model for the pipeline under the effects of catastrophic landslides using ABAQUS finite component analysis software, as well as making a finite element analysis on the pipeline stresses and deformation, which can be used as a reference for safety design and operations in landslide areas. This finite component analysis considered the buried pipeline and the surrounding soil mass as a system
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