关键词: 管道, 洪水, 数值分析, 有限元方法, 应力, 应变

Abstract: In order to study the interaction of flowing hydrodynamic force, buoyancy, pipe body, gravity of conveying medium and resistance of soil foundation on pipeline, the mechanical analysis model of pipeline under flood was established. The stress and strain of pipeline were calculated by numerical analysis method and finite element method. The results show that the calculation results of the two methods are close. Based on the finite element model, the effects of flood velocity and crossing distance on pipeline stress and strain are analyzed. The results show that when the velocity is greater than 3.0 m/s, the stress and strain of the pipeline increase with the increase of the velocity. When the crossing distance increases, the maximum stress and axial strain of the pipeline at the embankment gradually increase, but the increase decreases.When the crossing distance is less than 160 m, the stress and axial strain of the pipeline in the middle of the river increase with the increase of the crossing distance, and when the crossing distance is more than 160 m, the stress and axial strain decrease slightly with the increase of the crossing distance. The safety assessment of the buried suspended pipeline of Yulin⁃Jinan Railway is carried out. The results show that the immediate stress is 178 MPa, and the suspended pipeline is safe.

Key words: Pipeline, Flood, Numerical analysis, Finite element method, Stress, Strain