基于土弹簧模型的管道滑坡力学影响因素分析

Analysis of mechanical infl uencing factors of pipeline landslide based on soil spring model

滑坡是影响管道完整性的重要因素之一。基于土弹簧模型建立了滑坡管道有限元分析模型,考虑了管土之间相互作用的非线性特征,研究了管道内压、滑坡长度、滑坡位移、滑坡方向与管道轴向的夹角等因素对管道应力的影响。以陕京输气管道为例,分析了不同管道工况下滑坡相关因素对管道应力的影响,量化分析了垂直管道轴向的横向滑坡和平行管道轴向的纵向滑坡两种情况下的力学影响因素,得出滑坡方向与管道轴线的夹角对滑坡产生的附加应力具有重要影响,对于管道线路的完整性管理具有重要意义。研究结果可为滑坡地区管道的风险控制提供理论依据和技术参考。(图6,表1,参15)

Landslide is one of the main factors threatening pipeline integrity. Based on the soil spring model, the finite element analysis model of landslide pipe is established which considers the non-linear characteristics of interaction between pipe and soil, and the effects of internal pressure of pipe, length of landslide, displacement of landslide and the angle between the direction of landslide and the axial direction of pipeline on pipeline stress are investigated. Taking the Shan-Jing Gas Pipeline as an example, the paper analyzes the impact of the related landslide factors on pipeline stress under different working conditions. The mechanical influencing factors under the situations of landslide vertical to pipeline and landslide parallel to pipeline are quantitatively analyzed, which shows that the angle between the direction of landslide and the axial direction of pipeline has an important effect on the additional stress caused by landslides, this is of great significance for the integrity management of pipelines. This result can provide theoretical basis and technical reference for the risk control of pipelines in areas where landslides are likely to happen. （6 Figures, 1 Table, 15 References）