Study On Stress Analysis And Monitoring Of Pipeline Under Landslide

Pipelines in mountainous areas could be easily affected by landslide disasters,resulting in accidents such as pipeline leakage and shutdown,which causes incalculable economic losses.Based on the geological survey report and pipeline layout map around the pipeline in Zhejiang Province,this paper mainly studied on the law of pipeline stressstrain and displacement,the monitoring of pipeline stress-strain,and the pipeline landslide susceptibility under the influence of the landslide.Firstly,a finite element analysis model of pipeline in the situation of landslide was established by using the nonlinear contact mode of pipe and soil to study the mechanical behavior of the pipeline in such cases.The action law of different influencing factors on the pipeline stress,strain,and displacement under landslide was analyzed.The results suggested that,under the impact of landslide,pipeline displacement and soil cohesion are the most significantly affected items.Landslide monitoring should include pipeline stress-strain monitoring and landslide susceptibility monitoring.Secondly,based on the hardware foundation of the laid optical fiber natural gas pipeline and optical fiber test field,the application research of BOTDR technology in landslide pipeline stress monitoring is carried out,the data acquisition and signal processing program based on Lab VIEW is compiled,and the field test is completed.The results show that BOTDR technology is suitable for long-distance monitoring along the pipeline in mountainous areas.Finally,based on GIS technology,the evaluation model of pipeline landslide susceptibility based on the slope element method is constructed,verified with historical disaster data,and the results are incorporated into the GIS integrated platform to complete the monitoring interface of the pipeline landslide-prone area.The results show that the slope element method has high accuracy in the evaluation of pipeline landslide susceptibility,and the calculation results also provide a reference for the installation and site selection of pipeline stress monitoring.Starting from the pipeline stress analysis and integrating BOTDR,GIS,and other monitoring technologies,this paper explores the pipeline safety monitoring system from the three directions of "point,line,and surface",which can reduce the workload of frontline patrol personnel,have practical significance for pipeline safety management in mountainous areas,ensure the safe and stable operation and daily maintenance and patrol inspection of pipelines,and enrich the pipeline geological monitoring and early warning system in the whole Zhejiang Province,It lays a foundation for realizing one network of pipeline geological disaster monitoring in the whole province.