基于原型监测与数值计算的管道边坡灾害安全评估与分析  

Pipeline slope disaster safety evaluation and analysis based on in-situ monitoring and numerical calculations

作　　者：曾成 冯涵璐 王仁超 ZENG Cheng;FENG Hanlu;WANG Renchao(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;School of Computer Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,Sichuan,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]电子科技大学计算机科学与工程学院,四川成都611731

出　　处：《水利水电技术（中英文）》2024年第4期36-47,共12页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(U21A2008);四川省科技计划重点研发项目(2022YFS0586)。

摘　　要：【目的】我国的油气管道主要埋设于山区中,频发的边坡失稳对油气管道已构成重大威胁。边坡趋于不稳定时易产生滑坡,边坡的稳定性对管道的安全尤为重要。诸如遥感技术、原型监测、数值模拟的单一方法难以综合评估与分析管道边坡的安全。为解决该问题,【方法】基于原型监测与FLAC^(3D)数值模拟相结合的方法,分析曲靖站PQ083-020处输油管道本体和边坡的安全稳定性。【结果】对比原始工况和降雨工况下该边坡的稳定性及位移、管道位移及所受应力,结果表明,仅基于雨量、倾角、位移、土压力的单一参数,难以评估3个断面的稳定性强弱。监测期内最大降雨3.6 mm的作用下,边坡安全稳定系数等于1.027,处于欠稳定状态。【结论】降雨是导致边坡产生不稳定趋势、管道所受应力变大的因素之一。雨量预警阈值达到25 mm/d时,边坡有失稳破坏的风险。此时管道的应力为0.130 MPa,其位移为0.028 m,仍处于安全状态。研究成果为降雨期间的边坡安全预警提供一定指导,减少人员伤亡及财产损失,对边坡稳定性分析与管道的风险评估具有重要意义。[Objective]Oil and gas pipelines are mainly buried in mountainous areas in China and have been threaten by frequent slopes of slopes.The slope is easy to occur landslides when it is unstable,and the stability of the slope is particularly important for the safety of the pipeline.Single method such as remote sensing technology,prototype monitoring,and numerical simulation are difficult to comprehensively evaluate and analyze the safety of pipeline slope.To enrich the research in this area,[Methods]based on the method of combining prototype monitoring with FLAC~(3D )numerical simulation,this study analyzes the safety and stability of the oil pipeline and slope at the Qujing Station PQ083-020.[Results]Compared with the stability and displacement of the slope and the displacement and stress of pipelines under different original and rainfall working conditions,the result show that it is difficult to evaluate the stability of the three broken surfaces based on the single parameters of rainfall,inclination,displacement,and soil pressure.Under the effect of the maximum rainfall of 3.6 mm during the monitoring period,the safety and stability coefficient of the slope is equal to 1.027,which is lack of stability.[Conclusion]Rainfall is one of the factors that cause unstable trends in the slope and the increase of stress of pipelines.When the rainfall warning threshold exceeds 24 mm/d,the slope is risk of loss of stability and damage.At this time,the stress and displacement of the pipeline was 0.130 MPa and 0.028 m,which was still safe.The result of the research provide certain guidance for the early warning of slope safety,and the threat of the disaster near the project to the pipeline and nearby factories and personnel will be reduced,which is of great significance for the analysis of the stability of the slope and the risk assessment of the pipeline.

关 键 词：数值模拟 原型监测 油气管道 边坡灾害 风险评估 降雨 遥感 滑坡 

分 类 号：TE832[石油与天然气工程—油气储运工程]