土工布非饱和导水特性试验研究

在干旱半干旱地区，土工布常处于非饱和环境中，其排水能力取决于非饱和导水特性。对两种不同类型的土工布分别进行毛细高度试验、水分特征曲线试验和虹吸试验。分析了土工布的非饱和导水特性，讨论了孔隙特征对毛细高度，水分特征曲线以及非饱和导水系数的影响。结果表明:等效孔径越小的土工布毛细高度越大；土工布的吸力随含水量的增大而减小，等效孔径越小的土工布在较大的吸力范围内具有较好的持水性能；土工布的非饱和导水系数随吸力增大而减小，等效孔径越小的土工布非饱和导水系数对应的吸力范围越大，可在较大的吸力范围内保持良好的导水性。

Experimental Study on Unsaturated Hydraulic Conductivity of Geotextile

In arid and semi-arid regions，geotextile is always in an unsaturated environment with its drainage capacity depending on the unsaturated hydraulic conductivity.In this paper，the tests of capillary height，water characteristic curve and siphon on two kinds of geotextile were carried out，through which the unsaturated conductivity of geotextile was analyzed，and the effects of pore characteristics on capillary height，water characteristic curve and unsaturated transmissibility coefficient were discussed.The results show that the smaller the equivalent aperture，the larger the capillary height of geotextile；the suction of geotextile is decreased with increase of the water-content，and the geotextile with small equivalent aperture has good water holding capacity within the large range of suction；as the suction increases，the unsaturated transmissibility coefficient of geotextile decreases，and the geotextile with small equivalent aperture has the coefficient corresponding to a large range of suction and may keep good hydraulic conductivity therein.