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- W2108884596 abstract "In their paper, the authors show that with a municipal solid waste landfill modeled to represent balances of deformation stresses, naturally occurring short-term and long-term site settlement may be better characterized than with the past empirical or theoretical models that have generally assumed a rigid landfill skeleton. The authors propose a one-dimensional site model with a deformable matrix that combines time-varying stresses, caused by selfand imposed-weight, collapse and rearrangement of particles, decomposition and buoyant effects due to gas generation, and movement and liquid flows through the matrix. The latter is said to delay ultimate settlement rates. The authors point out that previous studies have incurred significant and unexamined estimation errors through indirect assumption of a rigid landfill skeleton, even when considering gas and liquid generation and flows. They however agree with previous investigators Bleiker et al. 1995; Wall and Zeiss 1995; Park and Lee 1997; Machado et al. 2002; Park et al. 2002; Hossain et al. 2003; Marques et al. 2003 , that total settlement may be characterized according to the conventional soil mechanics approach pioneered by Sowers 1973 and Edil et al. 1990 . This approach involves settlement with short-term or primary stage of compression that results from wasted self-weight and applied load, followed by dissipation of gas and liquid from voids in the system, and an extended period of secondary compression that is the result of particle rearrangement and slippage, and long-term microbially induced enzymatic decomposition. They note that gas generation rates patterned on secondary compression or settlement rates, which can continue for decades, account for most of the settlement, and have considerable engineering importance relative to landfill site reuses. One important innovation of this model is a possible first consideration of all phases as deformable, making their landfill representation more amenable to modeling as a completely viscoelastic system viscoelastic Maxwell bodies attached to compressible Hookean springs , per Edil et al. 1990 and Wall and Zeiss 1992 . In development of their model, for purposes of simplicity in use of landfill gas generation rates, the authors have followed the approach used by Findikakis and Leckie 1979 and Hossain et al. 2003 , who characterized landfill refuse according to biodegradability into three or more fractions, with specific first-order decomposition and methane gas yield rates. The authors have correctly noted that this is an oversimplification. They have also adopted the pioneering Emcon Associates 1980 general sto-" @default.
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- W2108884596 date "2007-07-01" @default.
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- W2108884596 title "Discussion of “Landfill Settlement with Decomposition and Gas Generation” by Ertan Durmusoglu, M. Yavuz Corapcioglu, and Kagan Tuncay" @default.
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- W2108884596 doi "https://doi.org/10.1061/(asce)0733-9372(2007)133:7(783)" @default.
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