The Burst Pressure Research And Dynamic Response Analysis On Buried Pipelines

The pipeline transportation has become one of the five major transportation ways: flight, railway, highway, waterway, etc.. Pipelines, especially buried pipelines, are unavoidable with the existence of this or that defect as the increase of service life and question because of processing and manufacturing, which influences the service life of the pipelines. The residual intensity assessment of the pipelines is one of the main content on pipeline integrality assessment. As a part of residual intensity assessment, the burst pressure of pipelines is an important content that lots of professors are studying. According to the burst failure theory, pipelines can't be seemed failed, even though all of the pipelines are up to plasticity. But when the pressure is big enough to make the bearing capacity reduced which caused by wall thinning. And the dynamic response of buried pipelines is a certain changing relationship between structure particle displacement, speed, acceleration and the time with the function of outer load.This text analyzed and studied the buried pipelines from dynamic and static respects: the residual intensity assessment and seismic response. By rearranging several flow stresses and bulging factors which were widely used in international rules for calculating burst pressure of pipelines and comparing the calculated results with experimental data, a result that flow stress affects the burst pressure of pipelines a lot was concluded.Having set up the interaction models of soil and pipeline with the finite element software, nodal displacement respond situation of buried pipeline is analyzed under the function of the third ground place and with the interaction of the seventh magnitude of earthquake.In addition, the paper, with the basis of corresponding theory, also introduced a simplified method about the interaction between soil and pipelines, which could transform the friction on the surface of the pipelines into the axial force acted on both of the two ends of buried pipelines. The method could simplify the interaction modal of soil and buried pipeline greatly.