煤矿开采影响下浅埋输油管线变形及力学响应特性

针对输油管线穿越采动影响区时的管道变形、选型设计和安全防护等问题，以山东某煤矿3308工作面开采为背景，根据该区域地质条件、管道参数及实测数据，采用数值模拟方法分析了煤矿开采影响下管道的受力变形及区域性特征，研究了管道及土体不同物理力学参数对管道所受应力变化的影响。结果表明：受采动影响的埋地管道变形可分为无变形区段、拉压过渡区段和压缩变形区段，拉压过渡区段存在轴向应力方向变化的拐点；3308工作面开采过程中，管道中点处沉降位移最大，与模拟的管道沿线地表最大下沉值相等，管土间的变形为“管-土协同变形”,管道所受轴向应力由管道两端向中点先增大后减小再增大；不同的管道与土体物理力学参数对管道所受轴向应力的变化有着不同的影响，管线选型时需要综合考虑。研究结果可为采动影响区埋地输油管线的选型设计、施工运营和安全维护提供参考。

Deformation and Mechanical Response Characteristics of Shallow Buried Oil Pipeline under the Influence of Coal Mining

Aiming at the problems of pipeline deformation, type selection design and safety protection when the oil pipeline passes through the mining affected area, taking the 3308 working face of a coal mine in Shandong Province as the background, according to the regional geological conditions, pipeline parameters and measured data, the stress deformation and regional characteristics of the pipeline under the influence of coal mining are analyzed by using numerical simulation method, and the influence of different physical and mechanical parameters of the pipeline and soil on the stress change of the pipeline is studied. The results show that the deformation of buried pipeline affected by mining can be divided into non deformation section, tension compression transition section and compression deformation section, and there is an inflection point of axial stress direction change in tension compression transition section; During the mining of 3308 working face, the settlement displacement at the midpoint of the pipeline is the largest, which is equal to the maximum subsidence value of the ground surface along the simulated pipeline. The deformation between the pipe and soil is "pipe soil cooperative deformation". The axial stress on the pipeline increases from both ends of the pipeline to the midpoint first, then decreases, and then increases; Different physical and mechanical parameters of pipeline and soil have different effects on the change of axial stress of pipeline, which should be comprehensively considered when selecting pipeline. The research results can provide a reference for the selection, design, construction, operation and safety maintenance of buried oil pipelines in mining affected areas.