论文部分内容阅读
非饱和土水力特性在非饱和土的研究中起重要作用。鉴于传统的测试方法耗时较长,提出能够快速测定非饱和土水力特性的动态多步流动方法。该方法基于Wei&Dewoolkar提出的多孔介质热动力学混合物理论模型,推导出能够描述非平衡态的非饱和土饱和度的演化方程,通过对粉土和粉质黏土两种试样开展动态多步流动试验,并根据动态试验结果求解饱和度演化方程,得出试样处于平衡状态时的土水特征曲线和渗透函数。该方法不需要求解初边值问题,仅仅需要动态多步流动的试验数据求解饱和度的演化方程,进而得出试样的水力特性参数,与其它方法相比,该方法更加简单有效。
The unsaturated hydraulic characteristics play an important role in the study of unsaturated soils. In view of the long time-consuming of the traditional test methods, a dynamic multi-step flow method that can quickly determine the hydraulic characteristics of unsaturated soils is proposed. Based on the theoretical model of thermodynamic mixture of porous media proposed by Wei & Dewoolkar, this method derives the evolution equation of unsaturated soil saturation that can describe the non-equilibrium state. Through the dynamic multi-step flow test of two samples of silt and silty clay, According to the dynamic test results, the evolution equation of saturation was solved and the soil-water characteristic curve and infiltration function were obtained when the sample was in equilibrium. This method does not need to solve the initial boundary value problem. It only needs the experimental data of dynamic multi-step flow to solve the evolution equation of the saturation, and then obtains the hydraulic parameters of the sample. Compared with other methods, this method is more simple and effective.