Research On Monitoring And Early Warning Technology For Geological Disasters Of Natural Gas Pipeline Landslide

Landslide is the most common form of geological hazard in the mountains in our country,and has the characteristics of high destructive effect,large-scale influence and hard to prevent.The natural gas pipelines which laying in the mountains are vulnerable to the impacts of landslides,and maybe bending even being fractured,then leading to the serious consequences.Pipeline landslide monitoring and early warning can make the people master the security status of landslides and pipelines and make reasonable measures to decrease the landslides'danger to pipelines.This article constructs the early-warning system by studying the laws of the development of landslides and stress characteristic of pipelines.Designing a set of pipeline landslide monitoring and early warning system based on Fiber Bragg Grating sensing technology.The main research work is as follows:(1)Investigating overseas and domestic literature about monitoring and early-warning technology,studying the adaptive of monitoring equipment,warning system and warning software.Analyzing deficiency of field monitoring,information transmission,warning system in monitoring-warning field.(2)Studying on morphological characteristics and evolution process and stability influence factors of landslide.Analyzing deformation features,failure cause,region of stress concentration distribution of natural gas pipelines under landslide stress by using ABAQUS finite element software.Establishing natural gas pipelines failure principle.To provide evidence for monitoring parameter selection,equipment selection and monitoring-point layout.(3)According to the Fiber Bragg Grating sensing technology and the methods applying to pipeline landslide monitoring,presents the Fiber Bragg Grating sensing based pipeline landslide monitoring project.It uses concrete beams,inclinometer pipes,and strain sensors of Fiber Bragg Grating to monitor surface displacement,deep displacement of landslides and pipe strain.For clearing the pre-monitoring pipe strain,proposes the method of computing pre-monitoring pipe strain.(4)Analyzing the displacement rate,displacement trends,displacement style of landslide and the law of raining impact in different developmental stages,proposing recognition methods of landslide developmental stages,in combination with risk analysis of pipelines with different strain.Constructing the early warning matrixes which can consider both landslide and pipeline's risk.It subdivides warning levels based on the degree of risk,clears warning scales.Constructing pipeline landslide multi-level warning system.(5)Based on study of requirements analysis,functional modules design,data analysis,warning model integration of upper computer warning software,establishing pipeline landslide monitoring-warning database,and developing "Natural Gas Pipeline Landslide Monitoring and Early Warning System" by C#programming language,achieve functions of dynamic monitoring of landslide developing and pipeline stress states,dividing early warning sections,identifying warning levels,working on hazard mitigation measures and data management,etc.Forming a general pipeline landslide monitoring and early warning platform.(6)Based on the characteristics of A natural gas pipeline landslide,we design a real monitoring arid early warning project and make adaptability analysis.Analyzing rainfall characteristics and its impact on landslide deformation,get the information of landslide surface and deep displacement and pipe strain.Identifying warning level by hazard risk analyzing,then preventing and controlling proposal to A pipeline landslide.