淤积泥砂对垂直地运动作用时刚性坝面动压力的影响研究

The effects of sediment on dynamic pressure acting on rigid dam during vertical ground motion

作者应用时域显式有限元模型分析了可压缩库水条件下淤积泥砂对垂直地运动作用时刚性坝面上动压力的影响。文中首先通过与解析解的比较,验证了计算模式的正确性。随后的分析中研究了作为液固两相介质处理的淤砂层的饱和度、厚度、渗透系数和孔隙率对坝面动压力的影响,以及作为液固两相介质、单相固体、单相重流体介质处理的淤砂层模型间的计算结果差异。计算结果表明:饱和淤砂层使得库水自振频率增加,而非饱和淤砂层使得库水自振频率明显减小。

The effects of sediment on the hydrodynamic pressures acting on rigid dams during vertical ground motion were studied By use of an explicit finite element scheme in this paper. and the model was also verified by comparing the results with the analytical solutions. Sediment was modeled as porous medium in the model and the effects of its saturation, thickness, permeability and porosity on dynamic pressures octing on rigid dam faces were analyzed. Finally, sedment was modeled as unitary solid and unitary fluid, respectively, and the results were compared with those obtained by modeling sediment as porous medium. The investigation shows that the fully saturated sediment would increase the natural frequencies of the reservoir water and the partially saturated sediment would decrease the natural frequencies significantly.