Improvement of mechanical behavior of buried pipelines subjected to strike-slip faulting using textured pipeline

doi:10.1007/s11709-019-0539-1

Front. Struct. Civ. Eng.

2019, Vol. 13

Issue (5) : 1105-1119 https://doi.org/10.1007/s11709-019-0539-1

RESEARCH ARTICLE

Improvement of mechanical behavior of buried pipelines subjected to strike-slip faulting using textured pipeline

Mahdi IZADI, Khosrow BARGI(

)

School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran

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Abstract

The present study investigates the mechanical behavior of a new generation of buried pipelines, dubbed the textured pipeline, which is subjected to strike-slip faulting. In conventional cylindrical pipelines, the axial and bending stresses brought about in their walls as a result of fault movement, lead to local buckling, which is construed as one of the major reasons contributing to pipeline failure. The present study has assessed 3-D numerical models of two kinds of buried textured pipelines, with 6 and 12 peripheral triangular facets, subjected to a strike-slip faulting normal to the axis of the pipelines, with and without internal pressure, with the two kinds of X65 and X80 steel, and with different diameter-to-thickness ratios. The results indicate that, because of specific geometry of this pipeline shell which is characterized by having lower axial stiffness and higher bending stiffness, compared to conventional cylindrical pipeline, they are considerably resistant to local buckling. The results of this study can be conceived of as a first step toward comprehensive seismic studies on this generation of pipelines which aim at replacing the conventional cylindrical pipelines with textured ones in areas subjected to fault movement.

Keywords buried pipeline textured pipeline local buckling

Corresponding Author(s): Khosrow BARGI

Just Accepted Date: 05 May 2019 Online First Date: 06 June 2019 Issue Date: 11 September 2019

Cite this article:

Mahdi IZADI,Khosrow BARGI. Improvement of mechanical behavior of buried pipelines subjected to strike-slip faulting using textured pipeline[J]. Front. Struct. Civ. Eng., 2019, 13(5): 1105-1119.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-019-0539-1
https://academic.hep.com.cn/fsce/EN/Y2019/V13/I5/1105

Fig.1 Three different pipes analyzed numerically throughout this study. (a) Conventional cylindrical Pipe; (b) textured Pipe with N = 12; (c) textured pipe with N = 6

Fig.2 Finite element model of the soil and steel pipeline. (a) Finite element model of soil block; (b) soil cross section; (c) finite element model of textured pipeline N = 12; (d) finite element model of textured pipeline N = 6

Fig.3 Deformation of the pipeline-soil system after fault displacement; finite element results depict the von Mises stress (X65 pipe, D/t = 72, Clay, w= 0.33 m, p = 0). (a) Soil block after fault movement; (b) conventional cylindrical pipeline; (c) textured pipeline with N = 12; (d) textured pipeline with N = 6

Fig.4 Textured pipelines under (a) pure axial displacement; (b) lateral displacement

Fig.5 Uniaxial nominal stress-engineering strain curve. (a) API 5L X65 steel; (b) API 5L X80 steel

Tab.1 Mechanical properties of soil and steel materials

Fig.6 Conventional cylindrical and textured pipelines under pure axial displacement (X65 pipe, D/t = 72, L= 20 and 60 m). (a) Pipelines with short length L= 20 m; (b) pipelines with long length L= 60 m

Fig.7 Conventional cylindrical and textured pipelines under pure lateral displacement (X65 pipe, D/t = 72, L= 60m). (a) Conventional cylindrical pipeline; (b) textured pipeline with N = 12; (c) textured pipeline with N = 6

Fig.8 The analytical and numerical peak bending and axial strains in conventional cylindrical pipeline (X65 pipe, D/t = 72, Clay, w= 0.33 m, p = 0)

Fig.9 Variation of axial strain at the compression side of the buckled area for different values of fault displacement (X65 pipe, D/t = 72, Clay, w= 0.33 m, p = 0). (a) Conventional cylindrical pipeline; (b) textured pipeline with N = 12; (c) textured pipeline with N = 6

Fig.10 Maximum axial strain at the critical pipeline area (X65 pipe, D/t = 72, Clay, w= 0.33 m, p = 0). (a) Conventional cylindrical pipeline; (b) textured pipe N = 12; (c) textured pipe N = 6

Fig.11 Variation of axial strain at the tensile side of the buckled area for different values of fault displacement(X65 pipe, D/t = 72, Clay, w= 0.33 m, p = 0). (a) Conventional cylindrical pipeline; (b) textured pipe with N = 12; (c) textured pipe with N = 6

Fig.12 Variation of axial strain at the compression side of the buckled area for different values of fault displacement(X65 pipe, D/t = 72, Clay, w= 0.33 m, p = 0.56 P_max). (a) Conventional cylindrical pipeline; (b) textured pipeline with N = 12; (c) textured pipeline with N = 6

Fig.13 Maximum axial strain at the critical pipeline area(X65 pipe, D/t = 72, Clay, w= 0.33 m, p = 0.56 P_max). (a) Conventional cylindrical pipeline; (b) textured pipe N = 12; (c) textured pipe N = 6

Fig.14 Variation of axial strain at the tensile side of the buckled area for different values of fault displacement(X65 pipe, D/t = 72, Clay, w= 0.33 m, p = 0.56 P_max). (a) Conventional cylindrical pipeline; (b) textured pipe with N = 12; (c) textured pipe with N = 6

Tab.2 Critical fault movement versus the diameter-to-thickness ration D/t (X65 pipe, w= 0.33m, p = 0)

Tab.3 Critical fault movement versus the diameter-to-thickness ration D/t(X80 pipe, w= 0.33m, p = 0)

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