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中文摘要：
基于离散颗粒模型的含间隙水颗粒材料液-固耦合分析，发展了Darcy渗流模型。应用特征线SPH方法求解液相，建立饱和与非饱和颗粒材料渗流模型的数值模型。数值例题给出饱和颗粒材料结构物在位移加载条件下的破坏模式及间隙水Darcy速度与水压力分布，并进一步模拟降雨条件下非饱和颗粒材料结构物的瞬态渗流过程，显示该模型模拟含间隙水颗粒材料结构物液-固耦合及变形的良好性能。
英文摘要：
Based on the discrete particle model, which is used to solve the solid phase and to obtain the individual grain＇s information such as location, velocities and displacements, etc., Darcy seepage model for the analysis of fluid-solid interaction in granular materials with interstitial water is proposed. Combined with the characteristic based smoothed particle hydrodynamics（SPH） method that is used to get Darcy＇s velocities, the numerical solution scheme for the seepage model of saturated and unsaturated granular materials is presented. Numerical results demonstrate the capability and good performance of the proposed model in modelling the fluid-solid interaction and deformation in granular materials with interstitial water.
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