中文摘要：

借助自主研发的非饱和渗透仪,采用瞬时截面法,试验研究汉十高速公路路堑边坡的弱膨胀土的非饱和渗透系数,分析吸力（或含水量）等影响因素对膨胀土渗透性能的影响。结果表明,试样的非饱和渗透系数为4.5×10-10～3.0×10-9m/s;且非饱和渗透系数与吸力之间并不是单一的增、减关系,进水初期阶段,渗透系数随吸力的减小而减小,但当吸力下降至一定值后,渗透系数随着吸力的减小而增大。

英文摘要：

Based on the instantaneous profile method,the unsaturated permeability of the weak expansive soil from Wuhan—Shiyan highway slope has been tested by using a self-developed permeameter. The influences of suction（or water content） on unsaturated permeability are analyzed. The test results show that the coefficient of unsaturated permeability of specimen is between 4.5×10-10 and 3.0×10-9 m/s,and it does not change linearly with suction. At the initial stage,the coefficient of permeability decreases with reduction in suction,whereas it reverses when suction is lower than a certain value.