不同地下水埋深条件下均质土壤毛管上升水运动特性试验研究

Experimental Research on Capillary Water Upward Movement in Homogeneous Soil Under Different Ground Water Tables

不同地下水埋深是影响土壤毛管上升水的含量及运动特性的重要因素之一。本文通过室内土柱模拟试验,研究了在不同地下水埋深条件下均质土毛管上升水的运动机理。结果表明:不同地下水埋深均质土壤毛管水上升高度和地下水补给量与时间之间均为幂函数关系,毛管水上升高度与地下水补给量之间呈明显的线性关系;不同地下水埋深条件下毛管水上升过程以毛管水上升速率为依据可划分为上升和稳渗两个阶段,在上升阶段,毛管水上升高度、平均上升速率及时间均与地下水埋深成正相关关系,但差异并不明显。

Groundwater table is one of the main factors affecting the transport characteristics of capillary water upward.This paper analyzed the mechanism of capillary water upward under different ground water tables by laboratory experiment.The results indicated that there was an obvious linear function relationship between the height of upward capillary water and underwater replenishment and a non-linear power function between them and time;capillary water upward process can be divided into two stages of rising and steady infiltration according to capillary upward rate.Capillary upward height,average rate of rise and time is positively related to groundwater depth in stages of rising,but the difference is not substantial.