Effect of Gas on Pore Pressures in Wet Landfills

Gas flow to a vertical gas extraction well in deformable MSW landfills

“…c Vertical gas conductivity is based on intrinsic permeability of 10 −12 m 2 and gas viscosity of 1.37 × 10 −8 kPa s mentioned by Townsend et al [26]. d The anisotropic ratio is k h /kv = 3.0. e Value is within the range calculated based on the data provided by Merry et al [25].…”

Sustainable Practices for Landfill Design and Operation

“…The role of leachate under several different scenarios was described, including perched zones of leachate within the landfill, leachate head on the liner, and added pore pressures resulting from liquids 268 addition. The potential role of landfill gas pressure was highlighted as an issue by Merry et al (2006). In a review of six landfill slope failures from sites around the world, Landva and Dickinson (2012) found that the properties of decomposed waste played a key role in the observed failures.…”

“…Most commercial models allow the designer to integrate water flow (and resulting pore pressures) and slope stability analysis. In reality, fluid flow in a landfill will consist of multiple phases and gas pressures have the potential to contribute to pore pressures (Merry et al 2006). Most commercial modeling software will not consider gas contributions.…”

Simulation of gas–leachate pressure in various tested landfills using the differential quadrature method

“…Gas and leachate are produced in landfills due to the degradation of the organic components, and their migrations are coupled with each other (Merry et al, 2006; Shen et al, 2018; Zhan et al, 2014). Previous studies found that the gas–leachate coupling effect caused an increase in gas pressure (Liu et al, 2011; Shi et al, 2016), which might lead to the instability of the landfill body (Fritz, 2003; Jafari et al, 2014; Merry et al, 2006; Zhan et al, 2015).…”

“…Gas and leachate are produced in landfills due to the degradation of the organic components, and their migrations are coupled with each other (Merry et al, 2006; Shen et al, 2018; Zhan et al, 2014). Previous studies found that the gas–leachate coupling effect caused an increase in gas pressure (Liu et al, 2011; Shi et al, 2016), which might lead to the instability of the landfill body (Fritz, 2003; Jafari et al, 2014; Merry et al, 2006; Zhan et al, 2015). Many researchers have studied the gas migration in landfills without considering the gas–leachate coupling effect, established different gas migration theories, and given different forms of analytical solutions (Li et al, 2013; Wise and Townsend, 2011) and numerical solutions (Feng et al, 2017; Vigneault et al, 2004).…”