摘要
用水–气运动联合测试仪对一定湿密状态下的黄土做了大量的试验,结果表明,一定含水量、不同干密度的土样浸水后,渗气系数随时间的变化趋势具有相似的规律,即具有在起初浸水后的短时间内减小,然后逐渐增大,最后趋于稳定的过程。另外,土的渗水和渗气系数随干密度的增大而降低,且干密度越大,降低的幅度也越大。在高饱和度时增湿路径对非饱和土的渗透系数影响不大,而在低饱和度时增湿路径对渗透系数影响较显著。
Through some experiments on the loess specimens with the prepared moisture and dry density, the characteristics of permeability for water and air phases in unsaturated soil are revealed using an apparatus for measuring water-air movement, and the mechanism of water-air movement and relationship between several measuring parameters are presented. The results indicate that air coefficients of permeability of several dry density soils experience a uniform tendency after adding a certain amount of water to the specimen with certain water content. At first, air coefficients of permeability cut down to rock bottom rapidly; then, they grow slowly; finally, the coefficients reach to constant. The time needed to reach a new stable state of permeability of pore water depends primarily on dry density and water content. Air and water coefficient of permeability will reduce with dry density increase. In addition, coefficient of permeability is not significantly influenced by the wetting path in high degree of saturation zone, while the influence is obvious in low degree of saturation.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第18期3258-3261,共4页
Chinese Journal of Rock Mechanics and Engineering
基金
陕西省黄土力学与工程重点实验室基金项目(02JS31)
关键词
土力学
非饱和土
渗水
渗气
新方法
soil mechanics
unsaturated soils
permeability of pore water
permeability of pore air
new method
