Sensitivity Analysis of Pipe-Soil Interaction Influencing Factors under Frost Heaving

The mechanism of pipe-soil interaction under frost heaving is complicated due to many factors affecting the pipe-soil system. In order to analyze the sensitivity of various pipe-soil interaction influencing factors and highlight the relationship between the factors and the pipe's mechanical characteristics during frost heaving, a pipe-soil interaction model based on a semi-infinite elastic frozen soil foundation is developed. Besides, the mechanical indices characterizing the influence factors and their change law are emphatically explored. The results show that the pipe stress changes most obviously at the transition region between the frost-heaving and non-frost-heaving regions. The equivalent stress increases nonlinearly with the increase of foundation coefficient, linearly with the increase of frost heave and elastic modulus of pipe, and decreases nonlinearly with the increase of transition length and pipe wall thickness. The peak stress of the pipe increases linearly with the increase of temperature difference. Moreover, the maximum allowable frost heave deformation decreases nonlinearly with the increase of oil pressure. This study helps provide theoretical reference for the adjustment, control, and prediction of stress and deformation in the design of buried pipelines under frost heaving.