连续地表位移作用下埋地管道应变计算模型

Calculation model for strain of buried pipeline under the action of continuous surface displacement

油气长输管道途经多种复杂地质环境,经常面临地质灾害的威胁。针对现有地质灾害段管道地表位移监测数据离散型的特征,提出了一种基于三次样条插值的地表位移三维重构方法,实现了地表位移的连续表示。在此基础上,采用非线性有限元方法,依据非线性土弹簧单元描述管土相互作用,利用Ramberg-Osgood本构模型描述管材力学特性,使用INP参数化编程语言建立了参数化的连续地表位移作用下埋地管道应变计算模型。新建模型能够考虑温度、外压等工作载荷与管道实际路由对管道初始应力的影响,实现管道应变的准确计算。采用C#编程语言,编制了基于C/S架构的管道设计应变智能计算与评估软件。研究结果可为智慧管道数字孪生的建设与地质灾害地段管道的完整性评估提供技术支撑。(图7,表3,参25)

The long-distance oil&gas pipelines run through areas with various complicated geological conditions and often face the threats of geological hazards.In terms of the discrete characteristics of the surface displacement monitoring data in existing pipeline sections threated by geological disaster,a three-dimensional reconstruction method of surface displacement based on cubic spline interpolation(CSI)was proposed to realize the continuous representation of surface displacement.Then,the pipe-soil interaction was described using the nonlinear soil spring element with the nonlinear finite element method,the pipes were described with the Ramberg-Osgood constitutive model,and the parametric calculation model for strain of buried pipeline under the action of continuous surface displacement was established with the INP parametric programming language.The new model takes the influence of the working load(such as temperature and pressure)and the actual route of the pipeline on the initial stress of the pipeline into consideration,and realizes the accurate calculation of the pipeline strain.The intelligent calculation and evaluation software for the design strain of pipelines based on the C/S architecture was developed with the C#programming language.The research results provide technical support for the Digital Twin construction of intelligent pipelines and the integrity evaluation of pipelines in geological hazard area.(7 Figures,3 Tables,25 References)