Dynamic Response Analysis Of Buried Pipeline In Frozen Soil Area Under Impact Load

Oil and gas resources is the constant improvement of urbanization in our country and an important foundation for the rapid development of economy in our country.Pipeline transport a short distance,large volume,high efficiency,continuity and reliability,no pollution,low cost,thus become the main way of transportation of oil and gas.With the continuous development of science and technology,the problem of pipeline transportation in complex terrain has been gradually solved.More than half of chinese land area is in the permafrost and seasonal permafrost.It is inevitable that the oil and gas pipeline should pass through the permafrost.Buried pipeline way complex geographical environment,the third party load become important factors threatening the safe operation of the pipeline,pipe outside this kind of load under the action of dynamic response analysis is not yet clear,thus,buried pipeline under impact force load,the dynamic response of a pipeline problems needs further study.This topic mainly in permafrost regions under the shock load problem of dynamic response of buried pipeline were analyzed,and the initial drop height and find the impact load and impact load shape initial fall,fall,pipeline buried depth,pipe wall thickness,initial moisture content of soil on the permafrost regions of buried pipeline in the law of the dynamic response under the shock load.Based on the experimental study method and the finite element analysis method in permafrost regions of buried pipeline by the dynamic response problem of shock load is analyzed,the main work are the following two aspects:1.Experimental research:Because in theory is difficult to solve the problems,therefore,in this paper,according to the influencing factors of different design a kind of easy to carry out the scale of 1:40 control study test model,using the northeast cold winter cold climate to realize the whole test system process.Fall was analyzed through experimental research,the initial drop height,falling body shape,pipeline buried depth and pipe wall thickness on permafrost regions of buried pipelines affected by the dynamic response of shock load,provide a reference basis for the engineering design,fill the part about domestic regions of buried pipelines under impact load test of related problems of vacancies,provide reference for further research.2.Finite element analysis:Finally,ANSYS/LS-DYNA was used to analyze the results.The correctness of the model establishment method was verified by comparing with the experiment,and the full-scale model was established by using this method.In the regions of buried pipeline impact load dynamic response problem of further exploration,supplemented by pipeline buried depth,soil initial moisture content and the impact of the shock load velocity,the influence of such factors on the problem provides a finite element modeling method,added test is difficult to develop part of the research,engineering design Suggestions are given.