RESEARCH ON THE LAWS OF SOIL SUBSIDENCE RANGE ON THE RESPONSE OF BURIED PIPELINES

In recent years, there have been frequent leakage and explosion accidents caused by the cracking of the circumferential weld of buried pipelines, and soil subsidence is one of the main reasons for the accidents. This paper carries out a numerical simulation analysis based on the soil spring model of the buried pipeline, and studies the mechanical response laws such as axial stress and deformation of buried pipelines under different subsidence ranges. The results show that: With the increases of the subsidence range, the deformation of the pipeline first gradually increases, and then remains unchanged, the axial stress of the pipeline, first increases, then decreases slightly, and finally remains unchanged. With the increase of soil subsidence amount, the dangerous subsidence range of soil increases. When the subsidence amount reaches the yield displacement of the soil, with the increase of subsidence range, the maximum axial stress of the pipeline increases. The results have certain guiding significance for the design and maintenance of buried pipelines.