压实黄土非饱和渗透系数试验研究

压实黄土非饱和渗透特性具有重要的工程意义。对不同干密度的压实黄土试样，采用非饱和导水率测定系统进行非饱和渗透系数量测，得到不同干密度压实黄土的渗透系数与吸力的关系。试验结果表明：渗透系数随吸力的增大而成非线性减小，随干密度的减小而增大；在低吸力时，干密度对渗透系数的影响较大；在较高吸力时，干密度对渗透系数的影响较小。进一步给出了压实黄土的渗透系数模型并进行回归分析，得到各Wind幂函数模型参数与干密度的关系，建立了基于干密度的压实黄土渗透系数的确定方法。

Experimental study of unsaturated permeability coefficient of compacted loess

Unsaturated permeability coefficient of compacted loess is studied by the test system of hydraulic conductivity under different dry densities. The relationship between matric suction and permeability coefficient shows that the permeability coefficient decreases with suction increase nonlinearly, and increases with dry density decrease. It is found that dry density has more effect on the permeability coefficient in the low matrix suction than in the high matrix suction.It is indicated that from test results，the relation between permeability coefficient and matrix suction can be fitted with power function model under certain conditions. The relationship between dry densities and parameters is explored for estimating the coefficient of permeability of unsaturated compacted loess.