跨走滑断层油气管道地震响应分析

Seismic response analysis of oil and gas pipelines crossing strike-slip faults

为研究埋地油气管道在走滑断层作用下的地震响应规律,基于土箱-管道缩尺试验,构建管土耦合非线性数值模型并验证其准确性,分析了管道壁厚、管道直径、管道埋深和断层破碎带宽度对埋地管道地震响应的影响。研究结果表明:埋地油气管道整体应变沿断层面呈反对称分布,峰值应变位于断层面0.2~0.5 m范围内,且压应变峰值略大于拉应变峰值;管道埋深对峰值应变影响最大,断层破碎带宽度对峰值应变出现的位置产生重要影响;浅埋较大管径和较大壁厚的管道,可有效减弱地震荷载对管道的作用。研究结果可为埋地管道抗震设计提供参考,对跨走滑断层埋地管道地震响应进行预测。

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.