Rayleigh波作用下埋地连续管道地震响应分析  

Seismic response of buried continuous pipelines subjected to Rayleigh waves

作　　者：王竞雄[1] 李鸿晶[1] WANG Jingxiong;LI Hongjing(College of Civil Engineering, Nanjing Tech University, Nanjing 211800, China)

机构地区：[1]南京工业大学土木工程学院,江苏南京211800

出　　处：《南京工业大学学报（自然科学版）》2020年第6期787-796,共10页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(51478222,51278245)。

摘　　要：以长距离运输油气管线为对象,研究埋地连续管道在Rayleigh波作用下的地震响应。采用Timoshenko梁单元模型离散钢质连续管道,管土相互作用效应通过弹塑性土弹簧进行模拟,建立管土系统有限元模型,并通过近似解析解验证管土相互作用有限元模型的可靠性。考虑Rayleigh波的频散特性并模拟其传播过程,同时考虑管道惯性,实现完整的动力分析。从Rayleigh波特性、场地条件、回填土类型、管道埋深与表面粗糙度多个方面分析相关参数对管道轴向应变响应的影响。数值计算结果表明,Rayleigh波的特征(周期和速度幅值)以及场地的几何和物理条件对管道动力响应均有显著影响。Based on long-distance oil and gas transmission pipelines,the effects of Rayleigh wave to the seismic responses of buried continuous pipelines were analyzed.A finite element(FE)model of pipe-soil system was established.In this model,the steel continuous pipeline was discretized with Timoshenko beam elements and the pipe-soil interaction was simulated by elastic-plastic soil springs.The FE model was verified by comparing numerical results with approximate analytical solutions.In order to implement full dynamic analysis,the process of Rayleigh wave propagation was simulated with consideration of its dispersive feature,and the pipe inertia was also considered.The effects of relevant parameters on axial strain of the pipe were explored from several aspects such as Rayleigh wave characteristics,site conditions,backfill soil type,burial depth and pipe surface property.The numerical results showed that the pipe dynamic response was strongly affected by the characteristics of Rayleigh wave(period and velocity amplitude)as well as the physical and geometrical properties of engineering site.

关 键 词：埋地连续管道 RAYLEIGH波 频散曲线 地应变 管道应变 

分 类 号：TU435[建筑科学—岩土工程]