AbstractA coupled thermo-hydro-bio-mechanical (CTHBM) numerical model to simulate the long-term b... more AbstractA coupled thermo-hydro-bio-mechanical (CTHBM) numerical model to simulate the long-term behavior of municipal solid waste in landfills is presented. Three numerical simulations—a convention...
Preliminary field observations during the removal of a composite geosynthetic liner system that h... more Preliminary field observations during the removal of a composite geosynthetic liner system that had been exposed for more than a decade are presented. The liner system was installed at a cell in a Subtitle D municipal solid waste landfill in San Luis Obispo, California (USA). The liner system consisted of (from top to bottom) a 1.5 mm-thick black HDPE geomembrane, a needle-punched geosynthetic clay liner (GCL), and a compacted subgrade. The liner system was not covered at any time since construction. The sides of the cell were relatively steep at 2H:1V slopes. Initially, the geomembrane was removed followed by removal of the geosynthetic clay liner. The geosynthetic clay liner panels were observed to be separated at multiple locations with gaps up to 220 mm wide and up to approximately 17 m long. The GCL also was relatively dry with granular consistency. In addition, a significant amount of bentonite that migrated from the GCL had accumulated between the GCL and the geomembrane at the toe of the slope.
Preliminary field observations during the removal of a composite geosynthetic liner system that h... more Preliminary field observations during the removal of a composite geosynthetic liner system that had been exposed for more than a decade are presented. The liner system was installed at a cell in a Subtitle D municipal solid waste landfill in San Luis Obispo, California (USA). The liner system consisted of (from top to bottom) a 1.5 mm-thick black HDPE geomembrane, a needle-punched geosynthetic clay liner (GCL), and a compacted subgrade. The liner system was not covered at any time since construction. The sides of the cell were relatively steep at 2H:1V slopes. Initially, the geomembrane was removed followed by removal of the geosynthetic clay liner. The geosynthetic clay liner panels were observed to be separated at multiple locations with gaps up to 220 mm wide and up to approximately 17 m long. The GCL also was relatively dry with granular consistency. In addition, a significant amount of bentonite that migrated from the GCL had accumulated between the GCL and the geomembrane at t...
AbstractA coupled thermo-hydro-bio-mechanical (CTHBM) numerical model to simulate the long-term b... more AbstractA coupled thermo-hydro-bio-mechanical (CTHBM) numerical model to simulate the long-term behavior of municipal solid waste in landfills is presented. Three numerical simulations—a convention...
This investigation was conducted to evaluate the beneficial reuse of post-consumer waste insulati... more This investigation was conducted to evaluate the beneficial reuse of post-consumer waste insulation materials in drilling and slurry applications. In particular, waste fibrous insulation was used to replace bentonite in slurry mixtures. Three civil engineering applications were considered for potential insulation waste reuse: drilled shaft/slurry trench construction, directional drilling, and vertical drilling. Effectiveness of slurries was assessed using conventional tests such as Marsh funnel viscosity, density, and filtrate loss. Filter cake thickness and filter cake permeability also were determined. Test results indicated that insulation materials could be used to replace up to 48% of bentonite in drilled shaft/slurry trench applications, up to 36% of bentonite in directional drilling applications, and up to 47% of bentonite in vertical drilling applications while maintaining acceptable engineering properties. Incorporation of waste insulation material in bentonite slurry mixtures is a viable beneficial reuse alternative.
AbstractA coupled thermo-hydro-bio-mechanical (CTHBM) numerical model to simulate the long-term b... more AbstractA coupled thermo-hydro-bio-mechanical (CTHBM) numerical model to simulate the long-term behavior of municipal solid waste in landfills is presented. Three numerical simulations—a convention...
Preliminary field observations during the removal of a composite geosynthetic liner system that h... more Preliminary field observations during the removal of a composite geosynthetic liner system that had been exposed for more than a decade are presented. The liner system was installed at a cell in a Subtitle D municipal solid waste landfill in San Luis Obispo, California (USA). The liner system consisted of (from top to bottom) a 1.5 mm-thick black HDPE geomembrane, a needle-punched geosynthetic clay liner (GCL), and a compacted subgrade. The liner system was not covered at any time since construction. The sides of the cell were relatively steep at 2H:1V slopes. Initially, the geomembrane was removed followed by removal of the geosynthetic clay liner. The geosynthetic clay liner panels were observed to be separated at multiple locations with gaps up to 220 mm wide and up to approximately 17 m long. The GCL also was relatively dry with granular consistency. In addition, a significant amount of bentonite that migrated from the GCL had accumulated between the GCL and the geomembrane at the toe of the slope.
Preliminary field observations during the removal of a composite geosynthetic liner system that h... more Preliminary field observations during the removal of a composite geosynthetic liner system that had been exposed for more than a decade are presented. The liner system was installed at a cell in a Subtitle D municipal solid waste landfill in San Luis Obispo, California (USA). The liner system consisted of (from top to bottom) a 1.5 mm-thick black HDPE geomembrane, a needle-punched geosynthetic clay liner (GCL), and a compacted subgrade. The liner system was not covered at any time since construction. The sides of the cell were relatively steep at 2H:1V slopes. Initially, the geomembrane was removed followed by removal of the geosynthetic clay liner. The geosynthetic clay liner panels were observed to be separated at multiple locations with gaps up to 220 mm wide and up to approximately 17 m long. The GCL also was relatively dry with granular consistency. In addition, a significant amount of bentonite that migrated from the GCL had accumulated between the GCL and the geomembrane at t...
AbstractA coupled thermo-hydro-bio-mechanical (CTHBM) numerical model to simulate the long-term b... more AbstractA coupled thermo-hydro-bio-mechanical (CTHBM) numerical model to simulate the long-term behavior of municipal solid waste in landfills is presented. Three numerical simulations—a convention...
This investigation was conducted to evaluate the beneficial reuse of post-consumer waste insulati... more This investigation was conducted to evaluate the beneficial reuse of post-consumer waste insulation materials in drilling and slurry applications. In particular, waste fibrous insulation was used to replace bentonite in slurry mixtures. Three civil engineering applications were considered for potential insulation waste reuse: drilled shaft/slurry trench construction, directional drilling, and vertical drilling. Effectiveness of slurries was assessed using conventional tests such as Marsh funnel viscosity, density, and filtrate loss. Filter cake thickness and filter cake permeability also were determined. Test results indicated that insulation materials could be used to replace up to 48% of bentonite in drilled shaft/slurry trench applications, up to 36% of bentonite in directional drilling applications, and up to 47% of bentonite in vertical drilling applications while maintaining acceptable engineering properties. Incorporation of waste insulation material in bentonite slurry mixtures is a viable beneficial reuse alternative.
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