[关键词]
[摘要]
由于非饱和土相对渗透系数对饱和度的变化十分敏感, 因此通过试验测定非饱和土相对渗透系数并不容易。 以广义达西定律和 van Genuchten 模型为理论依据, 可通过简单的蒸发试验和数值分析, 获得非饱和状态下土壤的 相对渗透系数。模拟结果和试验数据的对比分析表明, 该方法得到的非饱和土相对渗透系数具有一定的可靠性, 在 有限元反分析模型参数方面具有一定的创新性, 但其实际精度还有待通过试验对比来进一步验证。
[Key word]
[Abstract]
The relative hydraulic conductivity of unsaturated soil is sensitive to the change of saturation, so it is hard to determine the relative hydraulic conductivity through experiments. Based on the generalized Darcy cs Law and van Genuchten cs model, a simplified numerical model for predicting the relative hydraulic conductivity of unsaturated soil was derived. T hrough the simple evaporation experiment and numerical analysis, the relative hydraulic conductivity with function of water saturation was ob2 tained. T he numerical results were compared with the observed experimental data, which suggested that this method has certain reliability and it has certain innovation in the aspects of the finite element back analysis of model parameters. However, the prac 2 tical accuracy of the new method needs further verification through experimental comparison.
[中图分类号]
[基金项目]
山东省科技发展计划项目( 2012GNC11203)