Abstract
Abstract. Reverse fault movement is one of the threats for the structural integrity of buried oil-gas pipelines caused by earthquakes. Buckling behavior of the buried pipeline was investigated by finite element method. Effects of fault displacement, internal pressure, diameter-thick ratio, buried depth and friction coefficient on buckling behavior of the buried steel pipeline were discussed. The results show that internal pressure is the most important factor that affecting the pipeline buckling pattern. Buckling mode of non-pressure pipeline is collapse under reverse fault. Wrinkles appear on buried pressure pipeline when the internal pressure is more than 0.4 Pmax. Four buckling locations appear on the buried pressure pipeline under bigger fault displacement. There is only one wrinkle on the three locations of the pipeline in the rising formation, but more wrinkles on the fourth location. Number of the wrinkle ridges and length of the wavy buckling increase with the increasing of friction coefficient. Number of buckling location decreases gradually with the decreasing of diameter-thick ratio. A protective device of buried pipeline was designed for preventing pipeline damage crossing fault area for its simple structure and convenient installation. Those results can be used to safety evaluation, maintenance and protection of buried pipelines crossing fault area.
Highlights
Fault movement is one of the threats for the structural integrity of buried pipelines caused by earthquakes (Vazouras et al, 2010)
Evaluation of the response of buried oil-gas pipelines crossing the faults is among their top seismic design priorities (Karamitros et al, 2007)
Numerical simulation of buckling behavior of the buried X65 pipeline under reverse fault displacement in this paper led to the follow conclusions: 1. The buckling mode of non-pressure pipeline is collapse under reverse fault displacement
Summary
Fault movement is one of the threats for the structural integrity of buried pipelines caused by earthquakes (Vazouras et al, 2010). Evaluation of the response of buried oil-gas pipelines crossing the faults is among their top seismic design priorities (Karamitros et al, 2007) This is because the axial and bending strains induced to the pipeline by fault may become fairly large and lead to rupture, either due to tension or due to buckling. Duan et al (2011) presented a design method of subsea pipelines against earthquake fault movement, but not considering the buckling morphology of the subsea pipeline cross section. Pipeline is a thin shell structure, when the large deformation appears on the cross section of pipeline, superposition principle cannot be used for the interaction of axial strain and bending strain. The buckling behaviors of the buried nonpressure and pressure pipeline under reverse fault displacement were investigated by finite element method, considering the soil-pipeline interaction. The results can be used to safety evaluation, maintenance and protection of buried pipelines crossing fault area
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