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根据黄土存在裂隙(缝)的实际情况,在室内对有限边界条件下单裂隙黄土积水入渗特性进行了模拟实验。研究表明,黄土裂隙的存在,增大了土壤积水入渗能力,在土壤垂直与水平水力势梯度的共同作用下,由裂隙所增加的入渗量,集中表现在入渗初期,并直接与裂隙深度有关。文中提出了单位裂隙长度入渗增量比的概念,得出了裂隙入渗增量比在整个积水入渗过程中具有急剧上升、缓降与基本平稳三个阶段。在此基础上,采用回归分析方法,建立了有限边界条件下单裂隙的积水入渗模型,经实验资料验证效果良好。
According to the actual situation of fissure (seam) existing in loess, indoor infiltration characteristics of single fissured loess under finite boundary conditions are simulated. The study shows that the existence of loess cracks increases the infiltration capacity of soil water. Under the combined effect of vertical and horizontal hydraulic gradient, the infiltration capacity increased by the fractures is concentrated in the initial stage of infiltration and is directly related to Fracture depth related. In this paper, the concept of infiltration increment ratio of unit fracture length is proposed, and it is concluded that the incremental ratio of fracture infiltration has a sharp rise, slow down and stable in the whole water infiltration process. On this basis, using the regression analysis method, the water infiltration model with single fractures under the finite boundary conditions is established, which is verified by the experimental data.