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Significance of unsaturated behaviour of geotextiles in earthen structures

机译：土工结构中土工布不饱和行为的意义

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摘要

The unsaturated hydraulic characterisation of nonwoven geotextiles presented in this paper shows that they only require suctions between 0.8 kPa and 1.2 kPa to induce a rapid drop, of several orders of magnitude, in hydraulic conductivity. This implies that the inclusion of geotextiles in unsaturated earthen systems, for drainage or separation/filtration purposes, can potentially impede the flow of water and lead to a redistribution of the water content profile in the system. This latter aspect is the focus of this study. Geosynthetic drainage layers in contact with unsaturated soils were investigated using soil-geosynthetic columns where clay was in contact with a sand drainage material as well as with a drainage geocomposite layer (a geonet sandwiched between nonwoven geotextiles). The unsaturated drainage layers were found to impede downward flow of moisture consistent with the formation of a capillary break at the drainage layer-clay interface. Accumulation of moisture associated with an increase in moisture storage in the clay was observed, which progressed with depth until breakthrough of flow occurred into the drainage layer. Despite having significantly lower thickness than the sand capillary break, the geocomposite capillary break exhibited similar performance to the capillary break.
机译：本文介绍的非织造土工布的非饱和水力特性表明，它们仅需要0.8 kPa至1.2 kPa的吸力即可引起水力传导率快速下降几个数量级。这意味着出于排水或分离/过滤目的，将土工布包含在不饱和土系统中可能会阻碍水的流动并导致系统中水含量分布的重新分配。后一个方面是本研究的重点。使用黏土与排沙材料以及排水土工复合材料层（夹在非织造土工布之间的土工网）接触的土壤土工合成柱，研究了与非饱和土壤接触的土工合成排水层。发现不饱和排水层阻碍了水分的向下流动，这与在排水层-粘土界面处形成毛细破坏一致。观察到与粘土中的水分存储增加相关的水分积累，该积累随着深度而进展，直到渗流发生到排水层中为止。尽管其厚度比砂质毛细破坏小得多，但土工复合材料毛细破坏表现出与毛细破坏相似的性能。

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