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首页> 外文期刊>Journal of Pipeline Systems Engineering and Practice >Pullout Resistance of Buried Pipeline in Cohesionless Soil Nearby Sloping Ground
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Pullout Resistance of Buried Pipeline in Cohesionless Soil Nearby Sloping Ground

机译：斜坡附近无粘性土中埋地管道的抗拔力

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摘要

The vertical and lateral pullout capacity of a long pipeline buried in a cohesionless soil nearby sloping ground has been investigated by using lower-bound limit analysis in combination with finite elements and linear optimization. The ultimate uplift and lateral resistances offered by the pipeline in cohesionless soil have been computed for different combinations of embedment ratio, slope angle, distance between slope crest and center line of the pipe, and soil friction angle. The results obtained for a pipeline buried in cohesionless soil with a horizontal ground surface compared well with the existing theoretical and experimental data. The present work illustrates that being near sloping ground can cause a significant reduction in the pullout resistance of a buried pipeline as long as it is located within the optimum crest distance. The effect of being near sloping ground has been found to be greater for a larger slope angle. The normalized optimum crest distance depends on the embedment ratio, slope angle, and soil friction angle of the ground soil. For a pipe subjected to lateral pulling, the values of optimum normalized crest distance are found to be higher than the pipe subjected to uplift. The proximity of the stress state to yield for different crest distances is presented to illustrate the failure mechanism.
机译：通过结合有限元和线性优化的下限分析，研究了埋在斜坡附近无粘性土中的长管道的竖向和横向拉力。针对埋入比，坡度角，坡顶与管道中心线之间的距离以及土壤摩擦角的不同组合，计算了无粘性土壤中管道所提供的极限升力和侧向阻力。与埋藏在水平地面下的无粘性土壤中的管道所获得的结果与现有的理论和实验数据进行了比较。目前的工作表明，靠近倾斜地面可以使埋入式管道的抗拉强度大大降低，只要它位于最佳波峰距离之内即可。已经发现，对于较大的倾斜角，靠近倾斜地面的影响更大。归一化的最佳波峰距离取决于地基的埋深比，坡度角和土壤摩擦角。对于受到侧向拉拔的管道，发现最佳归一化顶峰距离的值要高于受到隆起的管道。提出了应力状态对不同波峰距离的屈服的接近度，以说明破坏机理。

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