To better understand the distribution characteristics of the stress field,temperature field,and dis-placement field in the bent section of a direct burial thermal pipe,this paper uses a real project as the research object.A finite element model of a multi-layer thermal pipe and surrounding soil was established,and thermal-mechanical coupling analysis was conducted to obtain the corresponding stress,temperature,and displacement fields.The results indicate that both the thickness of the polyurethane insulation layer and the stress in the steel pipe meet design requirements.In the bent section,the inner side of the steel pipe experiences higher stress than the outer side,with the maximum stress located at the lower inner part of the bend.The maximum soil dis-placement occurs on the outer side of the pipe,while the maximum displacement of the thermal pipe occurs on the inner side.Increasing the thickness of the insulation layer can reduce the temperature and maximum dis-placement of the pipe's outer wall,but it also increases the stress within the pipe.
Direct burial thermal pipeBent sectionsFinite elementThermal-mechanical coupling
维普
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