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循环荷载下桩承式路堤中土拱效应动力折减系数离散元研究
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Discrete Element Analysis on Dynamic Reduction Coefficient of Soil Arching Effect in Pile Supported Embankment under Cyclic Load
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    摘要:

    土拱效应是桩承式路堤中荷载传递的关键因素,其在循环荷载下的发挥程度与稳定性直接影响路堤的承载能力. 基于室内土拱效应模型试验,采用PFC2D软件建立桩承式路堤颗粒流数值分析模型,并通过土拱效应室内模型试验结果验证了该离散元模型的正确性 .基于该离散元数值分析模型,在路堤表面施加正弦波荷载模拟交通循环荷载,分析了循环动载作用下桩承式路堤中土拱效应的发展演变过程与衰减规律 . 数值模拟结果表明:路堤的高度与桩净间距的比值、动载振幅以及加载频率的改变均能影响土拱效应的发挥,但路堤的高度与桩净间距比值的变化对土拱效应动力折减系数的影响最大. 路堤的高度与桩净间距的比值是影响动载作用下土拱效应稳定发挥的重要因素,将此因素考虑在内并对离散元数值模拟结果进行分析与曲线拟合,推求了土拱效应动力折减系数的表达式.

    Abstract:

    Soil arching is the key factor of load transfer in a pile-supported embankment. Its development and stability under cyclic loading will directly affect the bearing capacity of the embankment. Based on the laboratory model test, a series of particle flow numerical models of the pile-supported embankment are established by using PFC2D software, and the correctness of the models verified by the laboratory model test results. Based on the discrete element numerical models, the embankment is subjected to vehicle cyclic loads simulated by sinusoidal wave loads, and the development and reduction of soil arching in pile-supported embankment under cyclic loading are analyzed. The numerical results show that the ratio of embankment height to pile spacing, cyclic load amplitude,and frequency all affect the soil arching in the piled embankment, while the variation of the ratio of embankment height to pile spacing significantly influences the soil arching reduction coefficient. The ratio of the embankment height to the pile spacing is an important factor affecting the stability of the soil arching in the piled embankment subjected to cyclic load. Hence, the expression of the soil arching reduction coefficient is derived based on the analysis and curve fitting of discrete element numerical results by taking those factors into consideration.

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崔晓艳,庄妍,张希栋,胡顺磊,程欣婷.循环荷载下桩承式路堤中土拱效应动力折减系数离散元研究[J].湖南大学学报:自然科学版,2022,49(9):164~172

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  • 在线发布日期: 2022-10-04
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