Abstract
A study of the complex pipe-soil interaction is initiated for the analysis and design of buried chilled pipelines in frost heaving soils. Stress gradients are generated at the interface between frozen and unfrozen ground. The differential heave, which is produced as the chilled pipe crosses from the unfrozen, heave-susceptible terrain to the frozen, nonheaving one, results in the generation of uplift forces on the buried pipeline. This paper characterizes the load-resistance response of the uplift-resistant side of the pipe as it is pulled upward at a constant displacement rate through the frozen ground. Uplift tests revealed crack patterns in the frozen soil around the pipe section. A theoretical assessment of tension-fractured and compression-crushed zones, which developed in the vicinity of the pipe and produced a reduced peak uplift resistance, is addressed.
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