摘要：In previous studies,soil spring stiffiness model without trench parameters was used to calculate theforce between pipe and soil.However,the trench parameters are of great significance to the pipelinedeformation caused by fault.In this paper,the sec-ond west-east gas pipeline was taken as the objectof study.Under the pipe trench parameters,thecalculation method of three-dimensional soil springwasdeterminedbyASCEcriterion.Athree-dimensional pipe-soil solid contact model was established using ABAQUS finite element software,and the accuracy of the model was verified.Based on 210 different trench,pipeline and laying param-eters,the soil spring stiffiness model of a high-gradenatural gas pipeline crossing fault was establishedby using 1stOpt fitting software,and the sensitivityanalysis of each parameter was carried out.Theresults showed that the model with pipe trench,thechange of soil resistance curve is more gentle,theaxial and vertical soil resistance decreases obvi-ously,and increases in horizontal and vertical di- rection.The force of the pipeline depends on pipediameter,burial depth,soil friction angle,and soil pressure coefficient.As this paper presents the re-sults of numerical modeling,exper imental studiesare suggested for future studies.The results couldprovide a reference for pipeline design and safetyevaluation under fault action.
