Design of reinforcement geosynthetics in landfill piggyback expansion Final cross section and layouts The final cross section for the vertical expansion of the cell is presented in Figure 6. Landfill gas management To ensure the collection of landfill gas from the existing waste and to avoid the development of hardpoints under the embankment, the following improvements have been proposed: * Old wells are modified to ensure a safe distance from the soil-reinforced layer. This distance is equivalent to the estimated maximum settlement under the future cell. * Old wells are not connected to the horizontal collector pipes; the gas FIGURE 6 Final cross section of the new cell Test Natural water content Dry unit weight Symbol Wn ρd Dmax < 50 mm Particle size distribution < 2 mm Methylene blue Sand equivalent Organic content by loss on ignition GTR class Proctor test T/m3 1.75 40.3 Immediate bearing capacity factor IPI 46.2 34.3 7.1 2.2 Fragmentability Consolidated drained triaxial φ' TABLE 2 Bottom ash material characterization 28 Geosynthetics | June July 2021 ° 37 FR c' kPa 1.9 42 IBC > 20 (average and for 3 values over 5) < 80 μm MBV SE LOI ρdOPN % % % - % % 39.7 4.7 0.04 67.8 7 F61 14 Similar to D2 Unit % T/m3 mm % Value 12.1 1.28 23 100 PSD 0/20 mm Comment 0.8 Wopn < W < 1.1 Wopn High fragmentability