Research On Monitoring And Early Warning Technology Of Natural Gas Gathering And Transportation Pipeline In Landslide Area

Landslides are the most common geological disasters in China,and they are characterized by short occurrence time,difficulty in prevention,and strong destructiveness.The Sichuan-Yunnan region has abundant rainfall and loose soil.The natural gas gathering and transportation pipelines laid near the mountainous areas are highly vulnerable to landslides,causing bending or fracture,which seriously threatens the lives and property of residents along the line.In order to ensure the stable transportation of natural gas gathering and transportation pipelines in landslide areas,this paper uses numerical simulation method to study the mechanical response of pipelines under landslides,build a multi-level monitoring and early warning system for pipeline landslides,design a monitoring and early warning system and supporting software,and in northeastern Sichuan.For example application,the main contents of the thesis are as follows:(1)The paper analyzes the mechanical response analysis method of buried pipelines under the action of landslides at home and abroad,and the application of new equipment,new methods and new technologies in pipeline landslide monitoring and early warning,and analyzes the shortcomings of pipeline landslide monitoring and early warning technology.(2)The morphological characteristics of landslides,classification methods and the mechanism of landslides on pipelines were studied,and the research foundation of pipeline landslide mechanics was established.The finite element model of buried pipelines in landslide area was created by finite element simulation software,and the accuracy was verified.The natural gas under different development conditions of landslides was analyzed.The strain distribution,stress characteristics and location of dangerous points of the gathering pipeline provide theoretical support for the selection of pipeline landslide monitoring parameters,the determination of monitoring schemes and the layout of monitoring points.(3)The elastoplastic finite element model of typical pipeline landslide in northeastern Sichuan is established.By analyzing the influence of pipeline material,soil property,landslide width and pipeline internal pressure on the strain of buried pipeline,the change of the position of pipeline strain monitoring point by different parameters is studied.The role of different parameters of sliding engineering in slowing down landslide development and preventing pipeline defonnation provides a theoretical basis for the development of landslide and the early warning interval of pipeline stress.(4)Analyze the instruments,monitoring characteristics and applicability of various monitoring methods for pipeline landslides.According to different monitoring requirements,select appropriate monitoring parameters,monitoring methods and monitoring points to construct a multi-level monitoring system.By studying the displacement of different development stages of landslides with time The changing law,the risk of the pipeline under different strain conditions and the economic loss caused by the pipeline leakage,the establishment of the pipeline landslide failure warning matrix and the risk warning matrix,the construction of the pipeline landslide multi-level early warning system;combined with the monitoring and early warning system Improve the pipeline landslide monitoring and early warning system.(5)According to the geological environment,pipeline characteristics and monitoring requirements of M pipeline landslide,the adaptability of the original monitoring scheme is analyzed,and the original monitoring scheme is improved based on the fiber grating sensing technology.After the analysis of the existing warning scheme for the M pipeline landslide,the R&D supporting "Gathering pipeline landslide hazard monitoring and early warning software" will be developed to realize the real-time monitoring data collection,database management,chart display and early warning grade division,etc.Dividing and other functions to meet the needs of real-time monitoring and automatic warning of M pipeline landslide.(6)Prepare pipeline landslide hazard monitoring and early warning regulations,expound the pipeline landslide hazard assessment method,formulate specific plans for pipeline landslide hazard monitoring and early warning,and propose prevention measures for pipeline landslide hazards.