A Study on the Mechanisms of Sand-layered Loess Interfering Rainfall Infiltration
The paper studies rainfall infiltration in the northwestern arid area. Laboratoryexperiments were conducted to confirm the sand-layered soil preventing water and the reason was shown theoretically. The results showed that the film water absorbed on the soil particle surface transferring is the main moisture migration way for the unsaturated ground-water in arid area where precipitation is very rare and the water always transfer from thick film to thin one. Film water flow capacity is positively related to the film water cross-section area. For the film water cross-sectional area of the sand layer is much smaller than the soil, so the film water retaining capacity of sand layer is far bigger than the soil. This is the basic reason why sand layer can prevent rainfall infiltration. This paper has discussed micro-mechanism about water-tightness of sand layered soil, and provided theoretical basis for pressuring sand phenomenon in northern area.
sand-layered loess rainfall infiltration film water preventing water
WANG Ting CHEN Jiansheng
Hohai University, Jiangsu China, 210098
国际会议
2009 International Forum on Porous Flow and Applications(第十届全国渗流力学学术会议)
武汉
英文
935-939
2009-04-26（万方平台首次上网日期，不代表论文的发表时间）