关键词: 人工冻土, 模型试验, 冻胀分析, 管道受力

Abstract:

In order to study the mechanisms of pipeline stress in the process of soil freezing in soft clay area， in this paper， the freezing model test of buried pipeline in saturated soft clay was carried out， and the temperature field， water field and displacement field of soil during artificial freezing， as well as the mechanical properties of the pipe， were studied. The results show that： （1） During the freezing process， the change of soil temperature field directly affects the distribution of soil water in the soil； （2） There is a strong water migration phenomenon in front of the freezing front， and a large amount of water migrates to the frozen front， causing linear frost heaving of the soil； （3） The rate of development of frost heaving is directly affected by external loads； （4） When the freezing develops to the position of the pipe body， the pipe body at the position of the frost heaving and unfrozen transition section exhibits a maximum stress. The results of the study are useful for the safety assessment of pipelines in normal frozen soil.

Key words: artificially frozen soil, model test, frost heaving analysis, the pipeline stress