【摘要】 考虑薄壳大变形和管土耦合相互作用,针对地震断层两侧场地相同和场地相异及中间含有破碎带等不同条件建立壳单元有限元分析模型。采用大变形壳有限元方法分析X80钢大口径油气管道穿越地震断层的应变响应。计算中考虑管道与土体的非线性,系统分析相应场地条件下管道壁厚、埋深、破碎带宽度、位错量、管道与断层管道交角等因素对管道应变响应的影响规律和变化曲线。比较以上不同参数变化条件下管道地震应变反应特征,分析各影响因素的灵敏度大小并总结其变化规律。研究结果表明:断层破碎带越宽,地震断层作用下管道产生的轴向变形越小,对管道的抗震越有利。同时得出,当断层两侧土体性质相异时,大口径油气管道更易发生较大的变形,其最大应变发生部位在管道与断层较硬一侧交汇处,应变响应也更加剧烈。更多还原

【Abstract】 A shell finite element model is set up on the basis of pipeline-soil coupling and large deformation of thin shell pipelines crossing faults with identical or different soil conditions on both sides,and the fractured zones in the middle.The strain response of X80 large diameter oil-gas pipeline crossing faults is analyzed by large deformation shell finite element method.Considering material nonlinearity of both pipeline and soil,the influence and variation of pipeline strain response are studied with influence factors such as wall thickness,buried depth,fault fracture zone width,slip magnitude,intersection angle of pipeline and fault.Pipeline strain response characteristics are obtained for different parameter variations.Sensitivity of the influence factors is compared,and the variation is summarized.The study indicates that pipeline axial deformation decreases with the increase of fault fracture zone width under earthquake.The deformation and strain response of large diameter pipeline tend to be more significant for different soil conditions of faults at both sides.The position of maximum strain is located at intersection between pipeline and the harder side of fault.更多还原