横穿滑坡天然气管道失效机制研究  

Research on failure mechanism of a fuel gas pipeline transversely crossing landslide

作　　者：韩俊杰 黄迪文 汪海超 王正鸿 邓清禄[1] HAN Junjie;HUANG Diwen;WANG Haichao;WANG Zhenghong;DENG Qinglu(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《人民长江》2022年第1期209-215,共7页Yangtze River

基　　金：国家自然科学基金项目(42077269);国家重点研发计划项目(2017YFC1501301)。

摘　　要：中缅天然气管道在贵州省晴隆县境内横穿蒋坝营滑坡。该管道两端边界岩土性质具有不对称性,一端为土-土边界,另一端为土-岩边界。考虑到管道两端边界岩土性质存在差异,建立了静力学模型,对管道的内力和变形进行分析,以揭示滑坡推力作用下该管道的力学响应特征。结果表明:①管道横穿的滑坡段处于不安全或破坏状态,不安全或破坏位置位于土-岩边界端;②管道的挠度分布曲线呈近似正态分布曲线形态,最大挠度位于中心偏土-土边界端一侧;③管道的弯矩分布曲线呈抛物线形态,管道中部外侧受拉,两端内侧受拉,土-岩边界端弯矩绝对值最大,管道最易发生破坏。研究成果可为类似存在敷设边界差异的管道横穿滑坡的安全评价及防治方案的论证提供参考。The China-Myanmar fuel gas pipeline crosses the Jiangbaying landslide in Qinglong County,Guizhou Province.The geotechnical properties at both ends of the boundary were asymmetric,one end with soil-soil boundary and another end with soil-rock boundary.Considering the pipeline with different geotechnical properties at both ends,the internal forces and deformation of the pipeline were analyzed by a mechanical modeling,thus,the mechanical response of the pipeline under landslide load was revealed.The results indicated that the pipeline was in a state of insecurity or failure,and the position was located at the end of soil-rock boundary.The distribution curve of the pipeline deflection was similar to the normal distribution,and the maximum deflection deviate to the end of soil-soil boundary.Besides,the bending moment distribution curve was a parabola.The outer side of the middle section was in tension,as well as the inner side of both ends.The pipeline close to the soil-rock boundary was the most prone to fail because the maximum absolute value of bending moment appeared at this end.These proposed results could provide a reference for the safety evaluation and prevention scheme preparing of pipelines crossing landslide with asymmetric boundary.

关 键 词：天然气管道 边界差异 静力学模型 强度校核 蒋坝营滑坡 

分 类 号：X43[环境科学与工程—灾害防治]