| With the rapid development of the urban and new rural areas, centralized heating isbecomes common. But insufficient construction space on the ground and city appearancerequirements, buried thermal pipeline is widely used, which makes the arrangement ofunderground pipelines being perplex. As one of the main components of city and newrural lifeline engineering, once the thermal pipe network is destroyed, it will harm topeople’s life and properties. Therefore, studies on the fracture and failure mechanism ofthermal pipeline under the static and dynamic loading have become an important subjectin lifeline engineering field, which is of great social and economic significance.Taking the finite element software-ADINA as a platform, the mechanical failuremechanism of buried thermal pipeline has been studied.3-D site-pipeline finite elementmodels under three coupling conditions have been established with ADINA-Parasolidmethod. Three coupling models include the pipe-soil interaction model, thermal couplingmodel and the integration model of these two. Under static load (gravity), dynamic load(displacement load, seismic load) and temperature load, the results of the pipeline’sfailure mechanism have been analyzed, which provide a certain theoretical basis forburied thermal pipeline damage and overall safety assessment.Based on the numerical calculation results of three established models, all kinds ofstress and strain curves have been plotted. Some conclusions are obtained. Stress-strain ofpipeline will be affected by the pipe-soil interaction either under static or dynamic load.So the pipe-soil interaction can not be ignored in the pipeline construction and operation.The effect of temperature on the pipeline is mainly in the axial direction, whichintensifies the pipe axial failure. The maximum stress of the pipeline is on the faultlocation, so fault is an important factor for thermal pipe destruction, which can not beignored and is also a key to engineering protection. |
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