Numerical simulation of buckling behavior of the buried steel pipeline under reverse fault displacement

摘要

Reverse fault movement is one of the threats for the structural integrity ofburied oil-gas pipelines caused by earthquakes. Buckling behavior of theburied pipeline was investigated by finite element method. Effects of faultdisplacement, internal pressure, diameter-thick ratio, buried depth andfriction coefficient on buckling behavior of the buried steel pipeline werediscussed. The results show that internal pressure is the most importantfactor that affecting the pipeline buckling pattern. Buckling mode ofnon-pressure pipeline is collapse under reverse fault. Wrinkles appear onburied pressure pipeline when the internal pressure is more than0.4 P_max. Four buckling locations appear on the buried pressure pipelineunder bigger fault displacement. There is only one wrinkle on the threelocations of the pipeline in the rising formation, but more wrinkles on thefourth location. Number of the wrinkle ridges and length of the wavybuckling increase with the increasing of friction coefficient. Number ofbuckling location decreases gradually with the decreasing of diameter-thickratio. A protective device of buried pipeline was designed for preventingpipeline damage crossing fault area for its simple structure and convenientinstallation. Those results can be used to safety evaluation, maintenanceand protection of buried pipelines crossing fault area.