摘要
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 fracture features of the loess, the ponding infiltration character of single fracture loess, in this paper, was simulated with the limited boundary in Lab. The results showed that the ponding infiltration capacity was increased for loess fracture. The increased infiltration capacity, under the interaction of horizontal and vertical hydraulic gradient, was concentrated expression in the early infiltration stage and had directly relationship with the depths of fracture. Based on this research, the concept of incremental ratio per unit fracture length was put forward. Then, a law was obtained that the incremental ratio on fracture loess infiltration have character of sharply rising, slowly falling and basically stabling in this process. On the basis, a ponding infiltration model of single fissure loess with the limited boundary was built by regression analysis and the results indicated that the model was ideal.
出处
《土壤通报》
CAS
CSCD
北大核心
2012年第5期1060-1064,共5页
Chinese Journal of Soil Science
基金
国家自然科学基金项目(50779055)资助
关键词
黄土
裂隙
入渗
湿润锋
增量比
Loess
Fracture
Infihration
Wetting front
Incremental ratio
