膨胀土渗透性室内试验与非饱和渗透系数预测

摘要

Considering the effect of atmosphere, the natural permeability variation process of expensive soil is simulated by lab test. The method of Fredlund & Xing is also used to predict the permeability coefficient of unsaturated expensive soil. The results show that drying-wetting cyclic action may increase the permeability of expensive soil, which illuminates the atmosphere influence depth evolution of cut slope. The results can supply parameter reference in design and numerical calculation.%考虑大气作用的影响,用室内试验的方法模拟自然条件下膨胀土渗透特性的变化过程,并采用Fredlund和Xing法对非饱和膨胀土的渗透系数进行预测分析.研究结果表明,干湿循环作用导致膨胀土渗透性逐渐增强,揭示了膨胀土堑坡大气影响深度的演化规律,研究结果可为工程设计和数值计算的参数取值提供参考.