Prediction of shear strength stress-strain behavior of MSW materials using Hyperbolic model and Evolutionary Polynomial Regression (EPR)

In recent years the rupture of landfill centers has resulted in the importance of studying the behavior of municipal solid waste (MSW). MSW as the main constituent element in landfills has a complicated performance. In this study, by using the results of large –scale direct shear experiments with dimensions of 300 mm x 300 mm x 150 mm, 2 models to predict the behavior of MSW with ages of fresh and 3 months are presented. The purpose of this investigation is to predict MSW stress-strain behavior for kahrizak landfill as a sample of developing countries landfills under aging and by structural models. These models are Hyperbolic model and Evolutionary polynomial regression (EPR). In these collection of experiments, aging process up to 3 months, was artificially applied to samples. Three normal stresses 20, 50,100 kpa and three shear strain rates 0.8,8,19 mm per minute were used for samples with different ages. The results of these two models, in addition to predict MSW behavior under aging and degradation, shows high accordance with experimental results by direct shear apparatus. Finally this study states the advantage of EPR model relative to Hyperbolic model in higher accuracy for all experiments.