黄土湿陷过程下埋地油气管道力学行为有限元模拟
发布时间：2019-03-12 16:49
【摘要】：针对黄土遇水后湿陷产生陷穴并引起埋地管道悬空这一过程中管道的力学行为,以基于弹塑性地基的黄土湿陷区悬空管道力学模型为基础,从湿陷原因和机理出发,建立三维有限元实体模型,模拟了土体湿陷过程和沉降变形,模拟计算结果与理论值和实测值进行了比对验证;进一步的计算和回归分析得到了管道最大位移、最大von Mises应力与地表土体湿陷沉降量的变化规律,同时也得到了最终湿陷情况下管道的von Mises应力分布和湿陷区范围的影响。结果表明:土体湿陷沉降是管道和土体共同作用的结果,湿陷前期管道与土体一起运动,位移和应力增加较快,而管道下方土体脱离管道产生陷穴后则增长较慢;管道最大位移和土体湿陷沉降量间呈对数函数关系,而管道最大von Mises应力和土体湿陷量呈指数函数关系;湿陷区管段向下弯曲变形会在3个位置形成应力集中区,湿陷区范围增大会引起管道应力和变形的明显增加,且3个区域的最值分布有所不同。
[Abstract]:In view of the mechanical behavior of pipeline in the process of collapsing loess collapsing and causing buried pipeline to hang, based on the mechanical model of suspended pipeline in loess collapsible area based on elasto-plastic foundation, the reason and mechanism of collapsibility are analyzed. A three-dimensional finite element solid model is established to simulate the process of soil collapsibility and settlement, and the calculated results are compared with the theoretical values and the measured values. Further calculation and regression analysis obtained the variation rule of maximum displacement, maximum von Mises stress and collapsible settlement of surface soil. At the same time, the distribution of von Mises stress and the range of collapsible zone of pipeline under final collapsibility were also obtained. The results show that the wet settlement of soil mass is the result of the joint action of pipeline and soil. The displacement and stress increase rapidly with the pipeline moving together with the soil in the early stage of collapsibility, but the increase of soil mass under the pipe is slower after the collapse occurs when the pipe is separated from the pipe. There is a logarithmic function relationship between the maximum displacement of the pipeline and the settlement of the soil mass, while the relationship between the maximum von Mises stress of the pipeline and the amount of the collapsibility of the soil is exponential. The downward bending deformation of pipe segment in collapsible zone will form stress concentration zone in three locations. The increase of collapsible zone will result in obvious increase of pipe stress and deformation, and the distribution of the maximum value of the three regions will be different.
【作者单位】： 西南石油大学土木工程与建筑学院;
【基金】：国家自然科学基金项目(5974105) 中国工程院重大咨询研究项目(2011-ZD-20) 高等学校博士学科点专项科研基金(20105121110003)
【分类号】：TE973
本文编号：2438975
[Abstract]:In view of the mechanical behavior of pipeline in the process of collapsing loess collapsing and causing buried pipeline to hang, based on the mechanical model of suspended pipeline in loess collapsible area based on elasto-plastic foundation, the reason and mechanism of collapsibility are analyzed. A three-dimensional finite element solid model is established to simulate the process of soil collapsibility and settlement, and the calculated results are compared with the theoretical values and the measured values. Further calculation and regression analysis obtained the variation rule of maximum displacement, maximum von Mises stress and collapsible settlement of surface soil. At the same time, the distribution of von Mises stress and the range of collapsible zone of pipeline under final collapsibility were also obtained. The results show that the wet settlement of soil mass is the result of the joint action of pipeline and soil. The displacement and stress increase rapidly with the pipeline moving together with the soil in the early stage of collapsibility, but the increase of soil mass under the pipe is slower after the collapse occurs when the pipe is separated from the pipe. There is a logarithmic function relationship between the maximum displacement of the pipeline and the settlement of the soil mass, while the relationship between the maximum von Mises stress of the pipeline and the amount of the collapsibility of the soil is exponential. The downward bending deformation of pipe segment in collapsible zone will form stress concentration zone in three locations. The increase of collapsible zone will result in obvious increase of pipe stress and deformation, and the distribution of the maximum value of the three regions will be different.
【作者单位】： 西南石油大学土木工程与建筑学院;
【基金】：国家自然科学基金项目(5974105) 中国工程院重大咨询研究项目(2011-ZD-20) 高等学校博士学科点专项科研基金(20105121110003)
【分类号】：TE973
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1 王博;王荣敏;孟鹏;李永军;;长庆油田黄土湿陷地区管道设计技术及发展趋势[J];内蒙古石油化工;2010年04期
，本文编号：2438975
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