NDLI: Assessment of the Design of an Experimental Cover with Capillary Barrier Effect Using 4 Years of Field Data

Content Provider	Springer Nature Link
Author	Abdolahzadeh, Amir M. Lacroix Vachon, Beit Cabral, Alexandre R.
Copyright Year	2011
Abstract	One important step in the design of inclined covers with capillary barrier effect (CCBE) is the determination of the water diversion length (DL). Numerical simulations can predict the DL more precisely than steady-state analytical solutions. Nevertheless, as simplified methods have always been part of engineering design, the application of analytical solutions with conservative boundary conditions, may allow engineers to make reasonable predictions, particularly during the pre-feasibility stage of a project. In this study, a CCBE was designed, constructed and instrumented at the Saint-Tite-des-Caps landfill, Quebec, Canada. This CCBE included a seepage control layer superimposing a sand-gravel capillary barrier. The seepage control layer was made up of deinking by-products (DBP), an industrial by-product that was previously disposed of as waste. The capillary barrier was designed using an adaptation of the Ross analytical solution and the scenario considered was that of steady-state flow during constant seepage flow applied uniformly at the top of the sand-gravel capillary barrier. Although these conditions appear simplistic, they were deemed reasonable because placement of the seepage control layer on the top of the capillary barrier led to very low suctions at the interface, thereby allowing uniform downward seepage rates, limited by the saturated hydraulic conductivity of the DBP. In this paper, a discussion about the behaviour of the cover system based on 4 years of field data from several instruments is presented. The challenge of using DBP, more precisely the settlement of the DBP layer and its impact on k sat , is also assessed. The DL was reassessed considering the new k sat . A discussion on the validity of employing analytical solutions to determine DL is also presented. This paper illustrates how certain variables affect the design of inclined CCBEs that include a highly compressible material as seepage control layer.
Starting Page	783
Ending Page	802
Page Count	20
File Format	PDF
ISSN	09603182
Journal	Geotechnical and Geological Engineering
Volume Number	29
Issue Number	5
e-ISSN	15731529
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-06-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cover with capillary barrier effect (CCBE) Diversion length Seepage control layer Waste Management/Waste Technology Civil Engineering Hydrogeology Geotechnical Engineering Terrestrial Pollution
Content Type	Text
Resource Type	Article
Subject	Soil Science Geology Architecture Geotechnical Engineering and Engineering Geology

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