横向滑坡作用下埋地管道参数敏感性研究

Sensitivity Study on Parameters of Buried Steel Pipe Under Lateral Landslide Actions

为研究横向滑坡作用下管道的参数敏感性,通过有限元模拟研究了不同滑坡、管道和土体参数下管道位移和轴向应变的变化特征。研究结果表明:管道力学响应随着滑坡位移和倾角的增大而显著增大,尤其是滑坡倾角大于40°时;埋地管道横向滑坡中受影响的管道长度和位移随滑坡宽度的增大而增大,但当滑坡宽度大于20 m后,管道轴向应变在滑坡区明显减小,管道危险性显著降低;管径、壁厚、管材与埋地管道力学响应呈负相关,内压、埋深、土体弹性模量、黏聚力与埋地管道力学响应呈正相关。研究探明了横向滑坡灾害下埋地管道的参数敏感性,对于保障横向滑坡下的埋地管道安全具有重要意义。

In order to clarify the parameter sensitivity of pipelines under lateral landslide actions,finite element simulation was conducted to understand the variation of pipeline displacement and axial strain under different landslide,pipeline and soil parameters.The results show that the mechanical response of pipelines significantly increases with the increase of landslide displacement and dip angle,especially when the landslide dip angle is greater than 40°.In the lateral landslide of buried pipelines,the length and displacement of the affected pipeline increase with the increase of landslide width.However,when the landslide width is greater than 20 m,the axial strain of the pipeline is obviously reduced in the landslide area,and the danger of the pipeline is significantly reduced.The pipe diameter,wall thickness and pipe material are negatively correlated with the mechanical response of buried pipelines,while the internal pressure,buried depth and elastic modulus and cohesive force of soil are positively correlated with the mechanical response of buried pipelines.The study has explored the parameter sensitivity of buried pipelines under lateral landslide disasters,which is of great significance for ensuring the safety of buried pipelines under lateral landslides.