【摘要】 为了揭示土体中水分迁移的运动机理,应用美国水分传感器及采集设备(6050X1 trasesystem),对封闭系统的小型试件进行恒温条件下底部补水的动态测试,得出土体含水体积分数随时间的变化曲线、浸润面上升速率和水通量与浸润面上升高度的曲线,并回归出浸润面上升速率与上升高度以及水通量与浸润面上升高度的关系式。研究结果表明:在试件中引起水分迁移最主要的因素是基质势和重力势;土体中各点的含水体积分数从试件底部开始到试件顶部逐渐增大,土体浸润面上升速率和水通量随迁移路径的增长呈减小趋势;土体的三相介质构成及孔隙连通性等因素是影响水分迁移路径与迁移动力的重要因素。更多还原

【Abstract】 To discover the movement mechanism of the moisture in the soil,the experiments are carried out on the small size sample of the closed system under constant temperature.During the experiments the water is supplied from the bottom of the sample all the time.The dynamic observation is implemented by the moisture sensor and the data acquisition facility(6050X1 trase system).The curve of the moisture value changing with time and the curves of the rise rate of soakage side and the water flux with the rising height of soakage side are analyzed.The expressions among the water flux,the rising rate and the height of the soakage side are regressed.The experiments showed that the base tendency and the gravity tendency are the most important factors to induce the moisture migration in the soil.The moisture content fraction of the soil increases from the bottom to the top for the sample,and the rising rate of the soakage side and water flux decrease with the transferring distance increasing.The results indicate the structure of soil with three mediums and the connectedness of hole are critical to the path of moisture moving and the migration motivity.1 tab,4 figs,9 refs.更多还原