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A platform for research: civil engineering, architecture and urbanism
Pipeline in dense sand subjected to tectonic deformation from normal or reverse faulting
Abstract The safety of fuel-carrying pipelines crossing a seismogenic fault that has the potential for large dislocation is of crucial importance to the environment. The paper studies parametrically the response of such operating pipelines to normal and reverse faulting, using an experimentally-validated finite element methodology. The experiments are performed in a split-box apparatus, with the numerical modeling mimicking faithfully its boundary conditions. To capture the physical reality, our analysis accounts for the axial displacement (elongation or shortening) of the pipeline due to the imposed large lateral (normal or reverse) displacements with suitable hybrid beam-on springs boundaries. The computed modes of failure include buckling and tensile rupture (necking), the occurrence of which depends on a number of parameters: the type of fault, the angle of faulting plane, and the internal pressure in the pipeline. The paper develops graphs appropriate for guiding the design and compares the findings with appropriate current code provisions.
Highlights Numerical methodology for simulating the response of pipelines to dip-slip fault rupture through cohesionless soil. Validated against bending tests of steel tubes, M-N plastic interaction envelopes, small-scale fault-pipe interaction tests. The Mohr–Coulomb constitutive model has been modified to render it compatible with the expected level of stress and strain. The significance of the axial component of a rupturing dip-slip fault is discussed. A way of realistically accounting for the axial restraint is demonstrated on the basis of a hybrid beam-on-springs boundary. The effect of the angle between the fault and the ground surface on the performance of the pipeline is discussed. The effect of internal pressure proves to be significant, usually but not always detrimental.
Pipeline in dense sand subjected to tectonic deformation from normal or reverse faulting
Abstract The safety of fuel-carrying pipelines crossing a seismogenic fault that has the potential for large dislocation is of crucial importance to the environment. The paper studies parametrically the response of such operating pipelines to normal and reverse faulting, using an experimentally-validated finite element methodology. The experiments are performed in a split-box apparatus, with the numerical modeling mimicking faithfully its boundary conditions. To capture the physical reality, our analysis accounts for the axial displacement (elongation or shortening) of the pipeline due to the imposed large lateral (normal or reverse) displacements with suitable hybrid beam-on springs boundaries. The computed modes of failure include buckling and tensile rupture (necking), the occurrence of which depends on a number of parameters: the type of fault, the angle of faulting plane, and the internal pressure in the pipeline. The paper develops graphs appropriate for guiding the design and compares the findings with appropriate current code provisions.
Highlights Numerical methodology for simulating the response of pipelines to dip-slip fault rupture through cohesionless soil. Validated against bending tests of steel tubes, M-N plastic interaction envelopes, small-scale fault-pipe interaction tests. The Mohr–Coulomb constitutive model has been modified to render it compatible with the expected level of stress and strain. The significance of the axial component of a rupturing dip-slip fault is discussed. A way of realistically accounting for the axial restraint is demonstrated on the basis of a hybrid beam-on-springs boundary. The effect of the angle between the fault and the ground surface on the performance of the pipeline is discussed. The effect of internal pressure proves to be significant, usually but not always detrimental.
Pipeline in dense sand subjected to tectonic deformation from normal or reverse faulting
Tsatsis, Angelos (author) / Loli, Marianna (author) / Gazetas, George (author)
2019-07-26
Article (Journal)
Electronic Resource
English
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