Local Buckling Behavior and Plastic Deformation Capacity of High-Strength Pipe at Strike-Slip Fault Crossing

Abstract

Abstract:As a typical hazard threat for buried pipelines, an active fault can induce large plastic deformation in a pipe, leading to rupture failure. The mechanical behavior of high-strength X80 pipeline subjected to strike-slip fault displacements was investigated in detail in the presented study with parametric analysis performed by the finite element model, which simulates pipe and soil constraints on pipe by shell and nonlinear spring elements respectively. Accuracy of the numerical model was validated by previous full-scale experimental results. Insight of local buckling response of high-strength pipe under compressive strike-slip fault was revealed. Effects of the pipe-fault intersection angle, pipe operation pressure, pipe wall thickness, soil parameters and pipe buried depth on critical section axial force in buckled area, critical fault displacement, critical compressive strain and post buckling response were elucidated comprehensively. In addition, feasibility of some common buckling failure criteria (i.e., the CSA Z662 model proposed by Canadian Standard association, the UOA model proposed by University of Alberta and the CRES-GB50470 model proposed by Center of Reliable Energy System) was discussed by comparing with numerical results. This study can be referenced for performance-based design and assessment of buried high-strength pipe in geo-hazard areas.

Mechanical Behavior of High-Strength, Low-Alloy Steels

“…In this context, knowledge of the microstructural and mechanical properties of such materials, as well as the development of accurate design and inspection methodologies is of major importance. Lavigne et al [4] present a comprehensive study of the microstructural and mechanical characterization of API 5L X52 steel; Silva et al [5] discuss the effect of precipitation and grain size on the tensile strain-hardening exponent of API X80 steel; Liu et al [6] analyze the local buckling behavior and plastic deformation capacity of high-strength X80 steel pipelines subjected to strike-slip fault displacements; and Vilkys et al [7] study the influence of mechanical surface defects on the safe operation of gas pipelines on the basis of fragments collected from operating parts.…”

Buried Pipeline Collapse Dynamic Evolution Processes and Their Settlement Prediction Based on PSO-LSTM

“…This is due to the "step" shape of soil loss, which causes the bottom of the pipe to be sheared by the soil. According to the literature [20][21][22], research shows that when the soil beneath the buried pipeline is lost, the maximum stress value of the pipeline appears at points A, B, C, and D of the pipeline cross-section. Therefore, in order to better analyze the failure mechanism of buried pipelines, we will further discuss and analyze the Von-Mises stress change rules at the top, bottom, and side of the cross-section of buried pipelines.…”

Mechanical Behavior of Polyethylene Pipes under Strike-Slip Fault Movements

“…In the above FE simulation work, the interaction behavior between pipe and surrounding soil was described using interaction models embedded in the FE software. The other widely used approach is to model pipe–soil interaction by spring element [ 14 , 15 , 16 , 17 , 18 , 19 , 20 ].…”