Centrifuge Modeling of Geosynthetic Reinforced Clay Liners of Landfills

Influence of Geogrid Layer on the Integrity of Compacted Clay Liners of Landfills

“…The properties of these geogrids are speciˆed based on: (i) rib cross-sectional area, (ii) grid opening size, (iii) tensile strength, and (iv) type of material composition. Based on the scaling considerations presented elsewhere by Viswanadham and Jessberger (2005), a model geogrid layer MG1 representing bandwidth of properties of commercially available geogrids has been selected and used in the present study. While scaling down the model geogrid, it was seen that it simulates both: (i) tensile strength-strain behaviour and (ii) frictional bond behaviour, which was considered by matching percentage open areas in model and prototype geogrids approximately.…”

“…Models RSL6, RSL5, and RSL4 were constructed by placing a geogrid layer at a depth of 0.25 times the thickness of clay liner from its surface, which are referred herein as reinforced clay liners. In this study, location of the geogrid within the GRCL wasˆxed according to Viswanadham and Jessberger (2005). Thickness of the reinforced clay liners is varied from 30 mm to 50 mm in model dimensions.…”

“…Very few investigators have attempted to study the deformation behaviour of CCLs subjected to nonuniform settlements (namely; Scherbeck and Jessberger (1993), Edelmann et al (1999), Viswanadham and Mahesh (2002), and Viswanadham and Jessberger (2005). Jessberger and Stone (1991) and Scherbeck and Jessberger (1993) have investigated the eŠect of overburden and the choice of liner material on response of model liners to the imposed deformations in centrifuge.…”

“…In order to enhance the tensile strength characteristics of the clay liner material, it is required to maintain stiŠ to very stiŠ consistency. This requirement is not only di‹cult to control in theˆeld, but also seldom possible to implement (Viswanadham and Jessberger, 2005). Depending upon the degree of non-uniform settlements, as it is di‹cult to ensure high ultimate tensile strain of liner materials, very often the eŠect of high tensile strain re‰ects in the form of cracks in the CCL, as shown in Fig.…”

“…Recently, Viswanadham and Jessberger (2005) reported e‹ciency of the adoption of Geosynthetic Reinforced Clay Liner (GRCL), which makes use of the tensile strength of the reinforcement inclusion in the form of a biaxial geogrid layer to limit W prevent clay liner from cracking. Earlier evidence of using the concept of reinforcement inclusion for diminishing the possible eŠects of transverse cracking in the earth dam crest was reported by Chritstie and El Hadi (1977).…”