| The China-Myanmar oil and gas pipeline project is a large-scale key project in my country and one of the key projects in the implementation of the energy strategy.The Qianbei Natural Gas Branch Pipeline Project(Qianbei Pipeline)is based on the planning and construction of a number of national oil and gas pipelines such as the China-Myanmar Oil and Gas Pipeline Project and the China-Guizhou Connection Line.The starting point is located in Xinzhou,west of Xinzhou Town,Xinpu New District,Zunyi City,Guizhou Province The distribution station passes through 3 districts and counties of Xinpu New District,Suiyang County and Zheng'an County.The terminal is located at Fengyi Pigging Station,Liba Village,Fengyi Town,Zheng'an County,Zunyi City,Guizhou Province.The total length of the line is 113.7km.The diameter is D610 mm,the design pressure is 10 MPa,the designed gas transmission capacity of the whole line is3.5 billion cubic meters per year,and the whole line uses L450 M steel pipe.In the end,it will reach a natural gas pipeline network in Guizhou Province with 3 national pipelines,8provincial-level pipeline branch lines and 45 county-level tie lines as interconnected.This paper takes the Qianbei pipeline project as the research background to study the pipeline geological disaster prevention and route passability design.Through analyzing the types,distribution,and characteristics of geological disasters along the pipeline,and with the help of large-scale indoor rainfall model tests,the main reasons for the instability of the slope where the pipeline is located are studied,which is the prevention and control of geological disasters along the pipeline and a cost-effective pipeline Provide technical support through sexual design.The research results provide guidance and reference significance for the construction and operation of many long-distance oil and gas pipelines in my country.The main work and research results of the thesis are as follows:(1)The engineering geological disasters of oil and gas pipelines are classified,divided into three categories and twelve sub-categories according to their characteristics.The corresponding development characteristics and possible hazards are explained according to the types,and the inducing factors and failure modes are analyzed.Summarized the prevention methods and measures applicable to different pipeline engineering geological disasters.(2)Taking the Qianbei Pipeline as the background,through field survey and systematic data collation,it has been clarified that the geological hazards developed along this section of the pipeline mainly include collapse,debris flow and unstable slope.A total of 86 geological hazards were found within 1 km on both sides of the central line,of which unstable slopes accounted for the most.Most geological disasters are mainly caused by rainfall.(3)Using the thinking of analysis of variance,selecting slope and rainfall as the main measurement factors,while maintaining the same external conditions,compare the infiltration depth,maximum void pressure and maximum seepage velocity of surface water under different slope and rainfall conditions.The difference provides a reference for the prevention and control of geological disasters.(4)Research and optimize the pipeline design plan and construction process.In addition to optimization from the selection line,different construction methods are used to avoid disasters to the pipeline environment,etc.,and reduce the land disaster caused by construction. |
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