Seismic response analysis of oil and gas pipelines crossing strike-slip faults
In order to study the seismic response of buried oil and gas pipelines under the action of strike-slip faults,based on the soil box-pipe scaling test,a nonlinear numerical model of pipe-soil coupling is constructed and verified for its accuracy,and the effects of pipe wall thickness,pipe diameter,pipe burial depth and the width of fault fracture zone on the seismic response of buried pipelines are analyzed.The results show that the overall strain of buried oil and gas pipeline is asymmetrically distributed along the fault surface,the peak strain is located in the range of 0.2～0.5 m,and the peak compressive strain is slightly larger than the peak tensile strain;The depth of the pipeline has the greatest influence on the peak strain,and the width of the fault fragmentation zone has an important influence on the location of the peak strain;shallow burial of pipelines with large pipe diameters and large wall thicknesses can effectively reduce the effect of the seismic load on the pipeline.The shallow burial of larger diameter and larger wall thickness can effectively weaken the effect of seismic load on the pipeline.The results of the study can provide reference for the seismic design of buried pipelines and predict the seismic response of buried pipelines across strike-slip faults.
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