Effect of Subgrade Condition on Hydraulic Conductivity of Geosynthetic Clay Liners
|摘要:||地工皂土毯(Geosynthetic clay liners, GCLs)為一種新近發展出之地工合成材料，它在歐美國家已經被廣泛應用在廢棄物掩埋場中，主要因為它有兩大優點：一是工廠生產品質良好穩定；二是施工容易。
Geosynthetic clay liners (GCLs) are a group of recently developed geosynthetic materials. GCLs have been used in landfills in the United States and European countries. GCLs have two major advantages: consistency in quality and ease of installation. The objective of this research is to study the hydraulic performance of GCLs on soils containing gravels. The hydraulic conductivity of needle-punched and adhesive-bonded geotextile-supported GCLs placed on gravel was measured using specially designed permeameter. Measurements of local thickness and mass per unit area of the specimens were taken after each test to quantify the migration of bentonite. Test results show that the hydraulic conductivity of both GCLs decreased with increasing confining stress. In general, migration of bentonite increased with increasing gravel size. Variation of thickness and migration of bentonite were generally less for the needle-punched product.
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