河流穿越高压输气管道悬空长度的动态演变过程及临界状态的数值方法研究
Study of Numerical Method on Critical Suspended Length and Critical Failure State of High-pressure Gas Pipeline Crossing Riverbed
作者：徐涛龙(四川大学 建筑与环境学院)；曾祥国(四川大学 建筑与环境学院)；姚安林(西南石油大学 石油工程学院)；郑健(四川大学 建筑与环境学院)；廖异(四川大学 建筑与环境学院)
Author：Xu Taolong(School of Architecture and Environment,Sichuan Univ.)；Zeng Xiangguo(School of Architecture and Environment,Sichuan Univ.)；Yao Anlin(College of Petroleum Eng., Southwest Petroleum Univ.)；Zheng Jian(School of Architecture and Environment,Sichuan Univ.)；Liao Yi(School of Architecture and Environment,Sichuan Univ.)
收稿日期：2012-06-12 年卷（期）页码：2012,44(6):79-85
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：输气管道；河流穿越；临界悬空长度；数值方法
Key words：gas transmission pipeline;crossing riverbed;critical suspended length;numerical method
基金项目：西气东输管道工程资助项目（07H461）；四川大学中央高校基本科研业务费专项资助项目
中文摘要
针对河流对穿越高压输气管道支撑边界的冲刷导致悬空长度变化的动态演变过程，利用ANSYS Multiphysics软件建立河床-管道-水流3维有限元整体模型。运用顺序耦合法实现了穿越高压输气管道由于水流冲刷引起悬空长度不断变化条件下流体与固体结构间双向耦合的动力学仿真。针对西气东输的实际高压输气管道，获得了在不同悬空长度和水流速度下管道的动态应力应变场及热点应力，基于强度准则确定了不同壁厚管道在不同流速下的临界悬空长度。提出的河流穿越高压输气管道悬空长度的动态演变过程及临界状态的数值方法，可为河流穿越输气管道的安全监测及风险评价提供理论支撑。
英文摘要
The whole 3D finite element model of riverbed-pipeline-flow was established to studied the dynamic evolution process of suspended length change resulting from river flushing of support of high pressure gas pipeline by using ANSYS Multiphysics. The sequential coupling method which achieved a two-way coupling between fluid and solid was used to analyze the variation law of the maximum effective stress and displacement of pipeline under different suspended lengths.The dynamic stress-strain field and hot spot stress of pipeline with different thicknesses under different flowing velocities were evaluated. Based on strength failure criterion, the critical suspended lengths of pipelines of West-East Gas Pipeline with different thicknesses under different flowing velocities were estimated. The dynamic floating simulation and failure state determine method of river crossing pipeline can provide theoretical support for the safety monitoring and risk assessment of river crossing gas pipeline.
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