碎石土斜坡优先流渗流特征试验

为研究碎石土斜坡在雨水作用下的渗流特性,以2种不同级配的碎石土为坡体模型材料,利用自行设计的模型槽开展雨水作用下优先流渗流特征的试验研究。试验模拟降雨入渗及地下水变化,在碎石土斜坡内部生成浅层孔隙及深层管道网络,采用染色示踪技术结合图像处理分析碎石土斜坡内部大孔隙流、管流以及漏斗流的渗流特征及成因。试验结果表明,采用室内试验方法模拟降雨及地下水变化,对于展现坡体内部与外界水分动态交换过程,研究优先流非均匀流动特性是一种非常有效的手段。

Experimental study on seepage characteristics of preferential flow in the gravel soil slope

In order to study the seepage characteristics of gravel soil slope under the action of rainwater,a self-designed model slot is applied to carry out the seepage experiment,taking two different gradations of gravel soils as model materials of the slope.The percolation properties of preferential flow and underground water change under the action of rainwater are simulated in the experiment,which successfully generate shallow pore and deep tunnel net inside the gravel slope.The dye tracing technology combined with image treatment are adopted to analysis the seepage characteristics and causes of the internal macropore low,pipe flow and funnel flow of the gravel slope.Test results show that carrying out laboratory tests to simulate rainfall infiltration and underground water change is an effective approach to disclose the dynamic exchange process of internal and external water of the gravel soil slope and to discuss the non-uniform percolation properties of preferential flow.