Abstract
In order to analyze the tension stress of Geomembrane in the seepage control system of landfill in heavy metal contaminated area under the action of the overlying landfill weight, the internal force of Geomembrane in landfill is studied in this paper. Firstly, according to the internal force analysis of Geomembrane model, the basic equation of Geomembrane is obtained, and the equation is analyzed by finite difference numerical solution, so as to analyze the internal force of Geomembrane in landfill. The method can analyze three stress states of Geomembrane-clay interface at different positions: elastic state, softening state and residual state, which makes the stress analysis of Geomembrane on landfill slope more reasonable. Parametric analysis shows that when the strength loss and the difference between residual displacement and peak displacement are small in the softening stage, the peak strength of Geomembrane-clay interface has little influence on the maximum tensile stress of Geomembrane, and its residual strength is the main controlling factor; and when the softening characteristics of Geomembrane-clay interface are obvious, the influence of peak strength and residual displacement is more obvious.
Highlights
Geomembrane is one of the most important components of bottom liner system and top cover system in modern sanitary landfill
The key to calculate the tensile stress of Geomembrane is to select the strength parameters
In view of the above problems, this paper studies the internal force of Geomembrane on the basis of clay interface, taking landfill as the core
Summary
Geomembrane is one of the most important components of bottom liner system and top cover system in modern sanitary landfill. In order to increase the interface strength, reduce the tension stress in Geomembrane and improve the stability of landfill interface, rough Geomembrane is more and more used in landfill’s slope liner system. The unit size, geographic location or land’s cover data set coefficients of landfills are similar, which leads to a significant decline in the performance of the model when applied outside the development area. It is necessary to adopt a more reasonable analysis model for the interface softening of Geomembrane to analyze the tension stress of Geomembrane on landfill slope. The influence of the height, slope gradient and anchorage length of Geomembrane on the tensile stress of Geomembrane is analyzed by the cable fractional solution
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