滑坡作用下横向折线形埋地输气管道的力学响应

中国地质大学(北京)水资源与环境学院

折线形埋地管道;非完全耦合数值模拟;现场监测;滑坡变形;管道应力集中

Mechanical response of polygonal-shape transverse buried gas pipeline under the action of landslide
XI Sha, WEN Baoping

School of Water Resources & Environment, China University of Geosciences (Beijing)

polygonal-shape buried pipeline, incomplete-coupling numerical modeling, in-situ monitoring, landslide deformation, pipeline stress concentration

DOI: 10.6047/j.issn.1000-8241.2019.12.005

备注

中卫—贵阳联络线K1224斜坡上的输气管道为典型的横向折线形埋地管道,受坡脚公路开挖和降雨影响,该段斜坡滑动导致管道变形。基于数值模拟和现场监测,通过管土分离的非完全耦合途径分析了不同工况下滑坡变形破坏特征和由此导致的管道力学响应。结果 发现:坡脚公路开挖叠加降雨后滑坡活动加剧,管道沿坡体滑动方向水平位移尤其明显,在转折端附近出现位移突增现象;管道转折端附近应力明显大于直管段,受微地形控制的不均匀滑坡位移及其力矩作用造成管道南侧转折端附近应力集中程度最大;管道南侧转折端附近应力已接近管道材料极限应力,是该段管道最危险的部位。(图 11表4,参[24]

The gas pipeline of Zhongwei-Guiyang tie line K1224 at the slope is a typical polygonal-shape transverse buriedpipeline. Due to rainfall and road excavation at the toe of the slope, the slide of this slope leads to pipeline deformation. In thispaper, based on numerical modeling and in-situ monitoring, the destruction characteristics of landslide deformation under differentoperating conditions and the corresponding mechanical response of the pipeline were analyzed by means of the incompletecoupling of pipe-soil separation. It is indicated that the activity of the landslide is intensified by road excavation at the toe of theslope together with rainfall. The horizontal displacement of the pipeline along the sliding direction of the slope is particularlyobvious, and the phenomena of sudden displacement increase occured near the turning points of the pipeline. The stress near theturning points of the pipeline is much higher than that in straight sections. Due to the uneven landslide displacement controlledby microtopography and its moment, the stress concentration degree near the turning point in the southern side of the pipeline isthe highest. What’s more, the stress near the turning point in the southern side of the pipeline is close to the stress limit of the pipematerial, so this part is the most dangerous area of this pipeline section. (11 Figures, 4 Tables, 24 References)

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