| 刘洋,周健,付建新.饱和砂土流固耦合细观数值模型及其在液化分析中的应用[J].水利学报,2009,40(2): |
| 饱和砂土流固耦合细观数值模型及其在液化分析中的应用 |
| Fluid particle coupled model for saturated sand and its application to liquefaction analysis |
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| DOI： |
| 中文关键词: 饱和砂土 流固耦合 离散单元法 液化 |
| 英文关键词: saturated sand fluid solid coupled model discrete element method liquefaction |
| 基金项目: |
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| 摘要点击次数: 3527 |
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| 中文摘要: |
| 在饱和砂土连续力学模型的基础上，建立了一个饱和砂土固相颗粒和液相流体耦合的细观力学模型，固相颗粒采用离散元的颗粒流理论模拟，液相流体通过求解平均Navier-stokes方程的计算流体动力学技术计算。该细观模型用二维渗流问题进行了验证，并将其应用于饱和砂土的液化分析。数值模拟结果显示，采用的模型可以描述从低雷诺流到高雷诺流范围很大的流体运动。液化分析表明：液化首先在试样的表层产生，接着向深部发展；而超孔隙水压力则从底部开始消散，然后逐渐向上发展，直至完全消散。砂土液化过程中土体孔隙率不断变化，渗透系数也随之改变。 |
| 英文摘要: |
| Based on the continuum model for analysis of saturated porous media, a fluid particle coupled model was established to simulate the meso-scale pore water flow and micro scale solid deformation of saturated soils. The particles were simulated by discrete element method, while the fluid flow was simulated by solving the average Navier Stokes equations. The validity of this model was verified by a two dimension flow case study and the model was applied to analyze the liquefaction phenomena of saturated sand. The numerical results indicate that the adopted model can be used to simulate the flow in a wide range of Reynolds number. The simulation results of liquefaction analysis show that the liquefaction begins from the surface and propagates downward,while the dissipation of pore water pressure begins from the bottom and propagates upward until vanished. The spatial and temporal changes of soil porosity and the variation of permeability coefficient in the process of liquefaction accord with this phenomenon. |
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