Seismic Response Analysis Of Buried Pipeline Crossing Fault

Oil and available natural gas resources,as an important national strategic reserve energy,are widely used in transportation,power generation engineering and chemical industry,and play an important role in maintaining national security and promoting economic development.However,due to the differences between the distribution of oil and gas producing areas and that of urban agglomerations,the development of regional economy and industrialization is restricted.From the exploitation of oil and gas to the processing of products and then to the application,it involves an important link,namely the transportation of oil and gas.At the same time,the existence of uneven distribution of natural resources short board also means that the oil and natural gas transportation operation must cross the super long distance.In the pipeline route planning,the natural conditions are complex and changeable,so it is inevitable for the oil and gas pipeline to pass through the seismic active area and fault zone active area.The buried continuous pipeline in the earthquake prone area will be affected by the propagation effect of seismic wave,which will cause the vibration damage of the pipeline or the cutting dislocation of the pipeline caused by the seismic fault activity,and then cause the large deformation of the pipeline and affect the normal operation of the pipeline.In this paper,through the design and manufacture of a simple shaking table test device,the seismic response of buried pipeline across fault is studied,and the numerical model of buried pipeline is established by using finite element software,and the influence of different parameters on the seismic response of pipeline is discussed.The main research contents are as follows:1)The types of seismic faults and failure factors of buried pipelines are summarized and analyzed.The displacement transfer coefficient is solved by combining structural dynamics and traveling wave theory,and the strain expression of buried pipelines is obtained.2)Two soil box test devices and a simple shaking table were designed and manufactured to study the pseudo dynamic test of 10 buried pipelines under strike slip fault conditions.The actuator is used to drive the simple shaking table to simulate the fault movement,and then the strain and displacement data of the pipeline under different loading conditions are obtained.The effects of fault zone width,pipe diameter,buried depth and wall thickness on the strain distribution and displacement of the pipeline are comprehensively analyzed.3)ABAQUS finite element software is used to establish the numerical model of long-distance buried pipeline under strike slip fault condition,and the corresponding strain and deformation response results are obtained.The finite element results are compared with the test results,so as to verify the effectiveness of the numerical model established in this paper,and provide reference for pipeline seismic analysis.