纵向滑坡条件下顺坡敷设管道力学响应分析

Mechanical response analysis of pipelines laid along the hillsides under the condition of longitudinal landslide

为了研究纵向滑坡作用下顺坡敷设管道的力学特性,结合山坡的地形特征和管道结构,选用土弹簧模型模拟管土相互作用,建立了顺坡敷设管道有限元模型,分析管道在山坡发生纵向滑坡状况下的应变分布。结果表明:发生纵向滑坡时,管道在弯管处存在滑坡敏感区域,位于坡脚弯管、坡顶弯管及滑坡两侧等4处位置的轴向应变较大;当滑坡方向与管道轴向存在夹角时,滑坡边界两侧管道轴向应变迅速增大;滑坡位置对弯管轴向应变影响较大。研究成果可为山坡敷设管道的安全维护提供技术依据。

To study the mechanical properties of the pipelines laid along the slope under the action of longitudinal landslides,combined with the terrain features of the hillside and the pipeline structure,the soil spring model is selected to simulate the pipe-soil interaction,and the finite element model of the pipeline laid along the slope is established to analyze the strain distribution of the pipeline under the condition of longitudinal landslide on the hillside.To study the influence of different landslide parameters on the laying of pipelines along the slope,different landslide conditions are set,and factors such as landslide width,landslide displacement,landslide location,and landslide angle are analyzed.The results show that when a longitudinal landslide occurs in a pipeline laid on a hillside,the pipeline has a landslide-sensitive area at the elbow.The axial strain is larger at four locations including the elbow at the foot of the slope,the elbow at the top of the slope,and on both sides of the landslide.When there is an included angle between the direction of the landslide and the axial direction of the pipeline,the axial strain of the pipeline on both sides of the landslide boundary increases rapidly,and the pipeline is more likely to be damaged.The position of the landslide has a great influence on the axial strain of the elbow.When the distance between the landslide and the elbow is greater than 30 m,the elbow is subject to less strain,and anti-skid piles can be installed at a distance of 30 m from the elbow.The failure criterion of the pipeline laid on the hillside under the action of the landslide is more suitable for the strain theory,which can give full play to the large deformation resistance of the pipeline.The research results can provide a technical basis for the safety maintenance of pipelines laid in landslide areas.