基于室内常规渗透试验，对延安新区重塑马兰黄土不同压实度下的渗透性进行研究，分析了饱和渗透系数随颗粒大小、孔隙度及干密度等因素的变化规律。试验数据拟合结果表明，该地区重塑马兰黄土的饱和渗透系数与孔隙度呈正指数函数关系，与干密度呈负指数函数关系。此外，不同干密度情况下，饱和渗透系数随时间变化的统计结果表明，当干密度大于1.6 g/cm3时，重塑马兰黄土的渗透系数不再随渗透时间变化，基本趋于稳定，且渗透性能低，因此可采用此干密度为不同要求和标准的地基压实工程提供参考和指导。

In this study, indoor routine permeability experiments were conducted to examine the saturated hydraulic conductivity of remolded Malan loess in Yan’an at different degree of compaction, and analyze the relationships between saturated hydraulic conductivity and several factors, including particle size, dry density and porosity. The results showed that saturated hydraulic conductivity had significant positive index correlation with porosity, and significant positive index correlation with dry density. Additionally, when the dry density was bigger than 1.6g/cm3, the saturated hydraulic conductivity was not only stable with total permeability time, but also small enough to be considered as impermeability. Hence, 1.6 g/cm3 could be adopted to guide the compaction engineering of different standards.

陕西省科技统筹创新工程计划（2012KTZD03-05）;国家自然基金（41572236）