机坪输油管道荷载附加应力分析

应用ABAQUS有限元软件,考虑管土相互作用,建立并验证了管道结构有限元分析模型.应用该模型,分析了管周附加应力的分布特征,计算了飞机、施工重型车辆和压路机荷载作用下,管道附加应力及其引起的管道结构应力和变形随管道埋深的变化规律.结果表明:不同管道埋深对应的管周附加应力在管顶至管两侧60°的范围内有显著差异,且该范围内附加应力近似呈抛物线分布.即使管道埋深小至1倍管径时,飞机荷载和施工重型车辆荷载引起的管道结构应力和变形仍远小于容许值,而压路机高振幅振动压应力引起的管道结构应力达到管道强度失效的临界标准,是管道承受的最不利外荷载类型,对管道埋深有重要影响.

Analysis on Additional Stress for Apron Oil Pipe under External Loads

To analyze the structural response of oil pipe under external loads, the interaction between oil pipe and its surrounding soil was simulated based on ABAQUS software, and the finite element models for apron oil pipe were established and verified. By applying the finite element models, the research presented the characteristics of additional stress distribution, and the structural stress and deformation of oil pipe varied with its buried depth induced by external loads including aircraft load, construction vehicle load and vibratory roller load respectively. The results indicate the additional stress distribution appears to be parabola curve in the range from the pipe top to the 60° side of pipe, and the additional stress values are distinct with different buried depths of the pipe. The structural stress and deformation of the oil pipe induced by aircraft load and construction vehicle load are far less than its allowable values, even if the buried depth approximates to its diameter, while the structural stress and deformation of the pipe induced by vibratory roller load reach strength failure criteria of pipe material, and the vibratory roller load is the most disadvantageous load type and has significant impact on the buried depth of the oil pipe.