FLOW CHARACTERISTICS OF HYBRID DRAIN SYSTEMS CONFINED IN FINE-GRAINED SOIL

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This paper reports an experimental investigation on the in-plane flow capacities of three HYBRID drain systems consisting of a combination of geocomposite layer and thin sand mat. Each of these drains is placed within two fine-grained soils, such as Kanto loam and commercial silty clay. Standard sample thickness of 100mm was considered when soil slurry was subjected to 50kPa consolidation pressure. During consolidation, facilities for conducting in-plane water flow tests as well as collecting water exclusively from the drain layers have been devised. Flow capacity of geocomposite drain reduced significantly as confining pressure increases. However, one of the HYBRID systems, in which thin sand mat was placed on both sides of the geocomposite, showed excellent flow capacity. Permeability of the soils reduced at faster rate than the same for embedded drain layer. All the drains performed well as permeability of the clogged drain remained above 105 times the soils. Compared to fresh non clog geocomposite drain sample, the in-plane flow capacity of the clogged samples reduced to well below 30%. This study confirms that thin sand mat works well as a protective blanket against clogging.
国際ジオシンセティックス学会日本支部の論文