Pipeline heave in cold environments is influenced by the transition zone between permafrost zone (frozen soil) and nonpermafrost zone (unfrozen soil) as well as the heaving behavior of the unfrozen soil in response to an advancing frost front. Operating a chilled pipeline in the transition zone between soils with different frost-heave susceptibilities faces problems. These transition zones often lead to pronounced differential heave in the pipeline, inducing stresses. Click here to enlarge imageChilled pipelines have become more necessary as interest in transporting natural gas from northern energy fields has grown. Natural gas transported via pipeline from these fields will encounter b...