萧山黏土非达西渗流性状的试验研究

针对传统固结理论不能考虑非达西渗流的不足，研究了渗流速度与水力梯度的非线性关系，总结出4种非达西渗流模型来研究在加载条件下土的渗透性的变化规律.利用GDS高级固结仪对萧山黏土试样进行了固结渗透联合试验，设定了多级常水头渗透试验并整理出渗流速度、水力梯度等相关试验结果，分析了非达西渗流模型的土性参数.试验与分析结果表明，三参数模型、幂指数模型和非线性分段模型这3种非达西渗流模型的拟合效果较好；折线渗流模型简单实用，在特殊情况下可以简化为线性渗流模型或达西定律.4种非达西渗流模型对于萧山黏土的渗流特性研究都是适用的.

Laboratorial study on non-Darcy seepage in Xiaoshan clay

Based on the nonlinear relationship of permeability velocity and hydraulic gradient, four non- Darcy seepage models were summarized to investigate the permeability behavior of soft soil under consolidation pressure. The consolidation-permeability combined test was performed on Xiaoshan clay sample using GDS advanced consolidation testing system, including several stages of constant head test. The behavior parameters of four non-Darcy seepage models were obtained by analyzing the permeability velocity and hydraulic gradient. Fitting results of three non-Darcy seepage models including three-parameter model, power exponent model and two-section model were pretty good, and broken-line model could be simplified to the forms of linear permeability model and Darcy model. All the four models are suitable for describing the non-Darcy seepage behavior of Xiaoshan clay.