Abstract
The antiseepage membrane applied to the slope of solid waste landfill often shows tensile failure in projects, which results in ineffective antiseepage system and serious environmental pollution. In order to ensure the practical performance of the antiseepage membrane, the tensile force of it was studied, and the settlement mechanical model of the interaction between landfill body, antiseepage membrane, and cushion was established after comprehensively considering the effects of dead weight, lateral pressure, settlement, and foundation boundary. The analytical solutions of the tensile force and displacement of the antiseepage membrane was calculated through differential equation of equilibrium. With general slag and ardealite slag as the research objects, the major parameters affecting the internal tensile force of the antiseepage membrane were analyzed and studied by the combination of numerical and theoretical methods. The results show that the internal tensile force of the antiseepage membrane is greatly affected by the parameters such as the membrane-slag interface friction angle, the membrane-cushion interface friction angle, the buried depth, and the single step height. The theoretical slope normal stress and membrane pull-up force are basically consistent with the numerical calculation results, which indicates that the theory is universally applicable to tackle the tensile failure of the antiseepage membrane in the solid waste landfill system.
Highlights
Landfilling is widely used around the world as one of the major methods for treating solid waste. e amount of solid waste treated by landfilling in China accounts for more than 70% of the total treatment [1,2,3,4], and most solid waste contains toxic and hazardous substances, which may cause serious pollution to the environment [1, 5,6,7]. e antiseepage membrane is extensively used in the antiseepage system of solid waste landfills due to its advantages of sound leakproofness, flexibility, and corrosion resistance
In order to theoretically explain the tearing of antiseepage membrane on the slope, Giroud and Beech [22], and Koerner and Hwu [23] calculated the tensile force of the Advances in Civil Engineering geomembrane on the slope through the limit equilibrium method; Kodikara, Liu, Liu and Gilbert, and Liu and Gilbert [21, 24,25,26] investigated the evolution of the internal tensile force of slope membrane in refuse landfills
The e ects of the land ll body dead weight, lateral pressure, settlement, and slope foundation were comprehensively considered. e di erential equation of membrane-slag-cushion equilibrium was established, and the analytical solutions of the tensile force and displacement of the antiseepage membrane was calculated. e e ects of related parameters were further studied through the combination of numerical and theoretical methods, with the results concluded as follows: 0 10 20 30 40 50 60 70 80 90 θ (°)
Summary
Landfilling is widely used around the world as one of the major methods for treating solid waste. e amount of solid waste treated by landfilling in China accounts for more than 70% of the total treatment [1,2,3,4], and most solid waste contains toxic and hazardous substances, which may cause serious pollution to the environment [1, 5,6,7]. e antiseepage membrane is extensively used in the antiseepage system of solid waste landfills due to its advantages of sound leakproofness, flexibility, and corrosion resistance. E antiseepage membrane is extensively used in the antiseepage system of solid waste landfills due to its advantages of sound leakproofness, flexibility, and corrosion resistance. It can effectively prevent pollutants from getting into the soil or groundwater, playing a significant role in environmental protection [8,9,10,11,12,13]. Rough theoretical and numerical methods, the effects of waste settlement and foundation platform on the stress born by the antiseepage membrane were considered in this paper, in addition to the impact of solid waste dead weight and lateral pressure. It is of great significance to ensure the completeness of the antiseepage membrane, prevent pollutants leakage, and protect the environment
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