Experimental Study On Mechanical Characteristics Of Geomembrane Under Upper Load

In landfill slope pad system, which makes liner system to generate friction when wastelandfill compression the interface between various materials to relative displacement. Fixationwould be destroyed by geomembrane stress, or creep would be damaged. The correct evaluationsystem of liner geomembrane is the stress of liner system design. At present, the study ofmechanical evaluation focuses on layer friction characteristics between the experimentalresearch interface, and the simulation test is also limited. Drawing test device is made, withdifferent characteristics between layers liner system interface friction on the basis of experiment.Through the simulation test and finite element analysis, the geomembrane mechanicalcharacteristics can be obtained.Two different geomembrane are studied. The highest landfill height is1meter, slope ratio is1:1.5, slope surface of the geomembrane is conducted by force characteristics of the experiment.Landfill geomembrane is changed caused by compression stress. Numerical analysis of tensionparameters is provided by drawing experiment device access to materials of the friction betweenthe properties for landfill geomembrane.Specific content as follows:(1) The homemade pull out tests have4kinds of liner device, which are alone, HDPEHDPE system+GT, alone EPDM, EPDM+GT. Parameters is provided under the condition ofdifferent interface of friction properties for follow-up evaluation theory.(2) The highest landfill height is1meter, slope ratio is1:1.5small landfill, slope surface ofthe geomembrane conducts force characteristics of the experiment. The landfill is0.25meterhigh is0.50meter,0.75meter or1.0m.(3) Through the limit equilibrium method and the finite element analysis, the different landfill geomembrane under high stress characteristics, evaluation and simulation test results arecompared. The results show that the limit equilibrium method of the calculation results has largererror, and the finite element calculation results are close to experimental result. Compared to theEPDM geomembrane, stiffness larger HDPE geomembrane results are compared, which aremore close to the experimental results.Through the simulation test and theoretical analysis, and some useful conclusions areobtained for the practical application of engineering, provides the basis, and it is helpful to thelandfill pad the design of the system.