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用改装的三轴渗气仪,在不同等向应力条件下对不同含水率的原状Q_3黄土进行渗气试验,分析了含水率、体积含气率及应力对渗气系数的影响,提出了直接及间接地反映含水率与应力变化对渗气系数影响的3种类型渗气函数。研究结果表明:应力对渗气系数与含水率及体积含气率关系皆有明显的影响,增湿时含水率及体积含气率对渗气系数的影响比减湿时稍大;应力变化(含水率不变)和含水率变化(应力不变)时渗气系数与体积含气率的关系不同。不同应力条件下相对渗气系数与相对体积含气率关系,渗气系数与修正体积含气率关系皆可分别用唯一的幂函数描述;不同含水率下渗气系数与规格化应力关系皆可用指数函数描述,且仅一个参数随含水率而变化。用3种类型的渗气函数皆可较好预测含水率及应力变化时的渗气系数,而其中无需引入力水耦合作用引起孔隙比变化的指数型渗气函数更便于工程应用。
The gas permeation test of Q_3 loess with different water content under different isotropic stresses was carried out with the modified triaxial gas seeker. The influence of moisture content, gas content and stress on the gas permeation coefficient was analyzed. The direct And three types of gas seepage functions which indirectly reflect the influence of water content and stress on the gas permeation coefficient. The results show that: the stress has a significant effect on the relationship between the gas permeation coefficient and the water content and the volume gas content. The influence of moisture content and volume gas content on the gas permeability coefficient is slightly larger than that on the dehumidification time when the humidifier is humidified. The same moisture content) and moisture content (stress constant) when the relationship between the gas permeability and gas volume ratio. The relationship between relative gas permeability and relative volumetric gas content under different stress conditions can be described by a unique power function. The relationship between gas permeability and normalized gas pressure at different water contents can be used Exponential function description, and only one parameter varies with moisture content. All three types of gas seepage functions can predict well the gas permeation coefficient when the water content and the stress change, but the exponential gas permeation function which does not need to introduce the change of the pore water ratio through the coupling of force and water is more convenient for engineering application.