Stress effect of the interface between buried pipeline and sandy soil layer in a cold environment

摘要

The interaction between buried pipe and soil is an important aspect of disaster prevention and mitigation. In this paper, interfacial stress tests between room-temperature or frozen sand and pipeline were performed to study the interfacial stress problems experienced by a buried pipeline in sand. According to the basic assumptions, a calculation model for the mechanical stress of the buried pipeline was established. The experimental data were used to verify the correctness of the theoretical calculation model and the stress-displacement formula of the buried pipeline interface was fitted. The stress-displacement curve of the interface between the pipe and the room-temperature soil was compared with the stress-displacement curve of the interface between the pipe and the frozen soil. The results show that the interfacial stress value calculated by the theoretical model of pipe-soil interfacial stress is consistent with experimental values. The stress at the pipe-soil interface after the sand was frozen is much larger than the stress at the pipe-soil interface when the sand is at room temperature. Frozen soil has a great influence on the pipe-soil interaction. This theoretical formula can be used to analyze the interfacial stress problem for the pipe-soil coupling and lay a foundation for further studies of the influence of the permafrost-pipeline interaction on the stress and strength of the pipeline.