Experimental and Numerical Study of the Isometric Cogged Biaxial Geogrid (Icb-Ggr)

Abstract

The main factors affecting the soil-geogrid interaction are friction, interlocking of the soil through the apertures and the soil particles size.In the present study a hypothesis assumption of modifying the conventional Biaxial Geogrid by adding cubic cogsdistributed in a sine wave order on both sides of the geogrid ribs, that could improve the soil-geogrid interaction by generate interlocking mechanism between the ribs and the soil."ICB-GGR"is the name of the proposed geogrid as an abbreviation for Isometric Cogged Biaxial Geogrid. To achieve the main goal of this study, an experimental test program wasimplemented and the conducted results wereused in executing a numerical model of the laboratory testsusing the PLAXIS 2D program. Results of the experimental tests showed improvement in shear resistance of about 50% when using the ICB-GGR in sand compared to using the Biaxial Geogrid under the same conditions. Typically, reliable numerical model has been established and achieved compliance with the experimental results by about 88%.

Interaction mechanism of Soil-ICB Grid

“…Moreover, it was noticed that the obtained results are the best representatives of the behaviour of grids since the relationships between the normal stresses (𝜎 𝑛 ), and the corresponding ultimate shear strengths (𝜏 𝑢𝑙𝑡 ) are nearly linear as shown in figures 8 and 9, respectively [6]. Finally, it is worth noting that only the tests results which serve the main goal of this study are introduced [10] [11].…”

“…In addition, the highest efficiency of Biaxial Grids occurs when the width of the grid's aperture is higher than 3.5 times the average particle's size of the soil [24]. It is worth noting that the recommendations and conclusions reported in the aforementioned studies were considered and applied to produce a novel cogged biaxial grid for improving the pull-out resistance of the reinforced soil [10] and [11]. The improvement would be gained by increasing the interface friction between the soil particles and the sine waveform cogs distributed on the ribs.…”

“…The improvement would be gained by increasing the interface friction between the soil particles and the sine waveform cogs distributed on the ribs. The acronym of the proposed grid is "ICB Grid" as an abbreviation form of Isometric Cogged Biaxial Grid, which was suggested in previous research that presented a detailed description for the ICB Grid system [10] and [11].…”