【摘要】 穿越逆断层的埋地管道在断层错动过程中呈现的失效样式复杂多样,根据逆断层错动管道受力特征分为压缩屈曲失效、Euler梁失稳失效两种失效模式,但对两种失效出现的工况认知不足.在管道抗震计算中通常借用管道在走滑断层错动时的反应分析方法来估算管道在逆断层中的变形状况,避免梁式失稳靠满足一定的埋深来保障.本研究利用ANSYS通用有限元程序建立了钢制埋地管道地震反应的有限元模型,以分析逆断层作用下管道的失效模式.该模型适合分析逆断层倾角≤80°的情况.计算结果显示:逆断层倾角≤45°,管道发生屈曲失效,管道失效部位在管道与断层破裂线相交处.倾角在50—70°之间,管道存在两种失效可能:当断层垂直位错量在0.7—1.0m之间时,管道出现失稳失效;当位错量大,错动速度快时,管道在与断层破裂线相交处发生屈曲失效.倾角在75—80°之间,管道屈曲失效和失稳失效可能相伴发生,屈曲失效部位出现在两处:(1)管道在与断层破裂线相交处失效;(2)失稳隆起处发生弯折.更多还原

【Abstract】 The failure types of the buried pipelines crossing reverse fault are complexity,but they can be divided into two kinds of failure mode by the characteristic of the fault dislocating:buckling failure and Euler beam buckling failure,and which kind of failure mode appeared under a certain earthquake is not known clearly.The analyzing methods of the pipe generally refer to the situation of the pipe crossing strike-slip fault,and to avoid the Euler beam buckling failure is depended on the modulating embedded depth.The failure modes of the steel pipes crossing reverse fault were analyzed by ANSYS finite element program in this paper.The model is suitable for the cases that the fault dip angles are ≤80°.The numerical results showed:when the angle ≤45°,buckling failure happened and the failure position was on the intersection of the fault fracture plane and the pipe;when the angle was between 50—70°,two different conditions were defined:if the vertical displacement of the fault was between 0.7—1.0m,the Euler beam buckling failure happened,or if the vertical displacement was large and the dislocating velocity of the fault was fast,the buckling failure happened.When the angle was between 75—80°,probablely both the buckling failure and the Euler beam buckling failure happened simultaneously,and two failure positions appeared:(1) on the intersection of the fault fracture plane and the pipe;(2) on the heaved position of pipe.更多还原