不同因素影响下粉砂质泥岩水分迁移试验

为研究不同因素影响下粉砂质泥岩的水分迁移规律，采用自制的泥岩水分迁移室内模型开展粉砂质泥岩的水分迁移试验，分析其在不同积水厚度、岩石干密度、入渗方向下的累积入渗量、入渗率时程曲线及含水率分布规律。结果表明：粉砂质泥岩累积入渗量-时间曲线先增大后趋于平缓，入渗率则随时间递减并趋于0；积水厚度对粉砂质泥岩累积入渗量的影响主要体现在入渗初期；岩石干密度越大，累积入渗量-时间曲线趋于平缓所需的时间越长；相同入渗时间下，竖向下渗、水平入渗及竖向上渗方向下的累积入渗量依次降低；粉砂质泥岩非饱和入渗时，含水率-时间曲线整体出现先增长后稳定的趋势，可划分为初始稳定期、快速增长期、低速增长期、稳定期4个变化阶段，且4个阶段的持续时间随距入渗面的距离而变化；积水厚度、岩石干密度及入渗方向均对粉砂质泥岩的水分迁移速率或水分迁移量产生影响，进而影响其含水率分布。研究结果可为分析粉砂质泥岩边坡的水分迁移规律及稳定性提供一定的参考依据。

Water Migration Test of Silty Mudstone Affected by Different Factors

To study the water migration law of silty mudstone under the influence of different factors, self-made, indoor, mudstone water migration models were used to perform the water migration test of silty mudstone. The cumulative infiltration, variation of infiltration rate with time, and law of water content distribution under different ponded water thicknesses, rock dry densities, and infiltration directions were analyzed. The results show that the cumulative infiltration of silty mudstone gradually increases with time, after which it stabilizes. However, the infiltration rate decreases with time and tends to zero. The influence of the ponded water thickness on the cumulative infiltration of silty mudstone is mainly reflected during the initial stage of infiltration. The larger the dry density of rock is, the longer the elapsed time for the cumulative infiltration-time curve to become gentle is. The cumulative infiltration in the vertically downward direction, horizontal direction, and vertically upward direction decreases successively for the same infiltration time. Under the condition of unsaturated infiltration of silty mudstone, the water-content-to-time curve shows a trend of first increasing and then stabilizing, and can be divided into four stages:initial stationary period, rapid growth period, low-speed growth period, and saturation period. The start or end time of the four stages vary with respect to the distance from the infiltration surface. The thickness of the ponded water, dry density of rock, and direction of infiltration all affect the rate or flux of water migration in the silty mudstone. This affects the water content distribution. The results of this research can provide a reference for the water migration law and slope stability of silty mudstone.