P2PSand和Finn本构模型在水库土石坝液化模拟中对比

Comparative Analysis of P2PSand and Finn Constitutive Model in Liquefaction Simulation of Earth-rock Dam in Reservoir

  • 摘要: 为了研究地震作用下水库土石坝饱和砂土坝基可液化土层的影响规律,以某水库土石坝为背景,运用FLAC3D分析Practical Two-surface Plastic Sand(简称P2PSand)本构模型和Finn本构模型下的水库土石坝可液化粉砂层的液化分布规律、坝体变形特点以及坝坡的稳定性。计算结果表明:P2PSand模型下可液化粉砂层的液化程度、范围以及水库土石坝坝体位移均大于Finn模型,水平位移较显著;两种本构模型下水库土石坝坝体均出现两条明显的滑动面,稳定性降低。

     

    Abstract: In order to study the effect of earthquake on the liquefiable soil layer of saturated sandy soil foundation of earth-rock dam of a reservoir, taking earth-rock dam of a reservoir as the background, FLAC3D is used to analyze the liquefaction distribution law, the deformation characteristics of dam body and the stability of dam slope under the Practical Two-surface Plastic Sand (P2PSand) constitutive model and Finn constitutive model. The results show that the liquefaction degree and range of the silty sand layer under P2PSand model and the displacement of the dam body of the reservoir are greater than Finn model, and the horizontal displacement is more significant. Under the two constitutive models, two obvious sliding surfaces appear in the dam body of the reservoir, and the stability decreases.

     

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