| Summary: | 碩士 === 中原大學 === 土木工程研究所 === 90 ===
Geosynthetic Clay liner (GCL) is the geosythetic developed in resent years. It is commonly used as the Hydraulic Barrier to decrease the liquid permeation. GCL is now broadly used in Europe and the US. It is applied to all kinds of constructions, such as water channel, pound, reservoir, and it is especially important in Landfill. The polluted and poisonous liquid due to the wastes would permeate the soil layer, and subsequently pollute the environment. In order to prevent the pollution, all Landfills have the Hydraulic Barrier. GCL has great performance as a material of liner.
To understand the effect of GCL applied as Hydraulic Barrier, many qualitative and property tests were done in this study. These tests were focused on Geotextile, Bentonite, and GCL itself, and three different types of betonites from various regions have been used. Moreover, the environment condition was added to simulation, so as to learn how the wet-dry cycling affect the Hydraulic Barrier property of GCL.
The testing result indicates that the Hydraulic Barrier effect of GCL decreased with wet-dry cycling. Due to the wet-dry cycling, the bentonite in GCL would be washed away by water flow, and furthermore formed cracks. Subsequently GCL would lose its Hydraulic Barrier efficiency.
During the wet-dry cycling of GCL, it’s found that the relativity between the permeation and stability of GCL is not obvious. GCL with great Hydraulic Barrier dose not necessarily has stable durability and engineering applicability. On the other hand, GCL with lower Hydraulic Barrier property might have more stable durability, when geotextile and manufacturing combined well. Hence, the GCL used in situ should be chosen according to the quality control of GCL manufacturing, the estimation and design of the whole construction. Thus the GCL product would fully reach its practicability.
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