Study In Characteristic Of Waste And Internal Forces Of Slope Geomembrane In Landfill

With the urban development, the amount of garbage increases sharply, and wastedisposal has become a major problem in the process of urbanization in worldwide. Currently,the method of landfill has been widely recognized and applied. Geomembrane, used as corelayer for isolation, is of great responsibility for landfill safety. Therefore, it is of greatsignificance to conduct study in characteristics of waste and analysis of internal forces ofslope geomembrane in landfill.With the growing application of waste incineration technology, production of bottomash is also increasing. At present, the major disposal method for bottom ash is landfill. Inorder to further understand the relevant mechanics and engineering characteristics of wasteincineration bottom ash, a series of laboratory tests have been conducted on the collectedsamples in this study, including sieving analysis, direct shear tests, compression test, etc.The test results show that bottom ash is a kind of low compressive soil, with small frictionangle and cohesion value, which may be associated with the low content of fine particles(below0.075mm). The study results can be of reference value for waste landfill design.In addition, the upper additional load may lead to significant increase in geomembranetension, which is necessary to be studied so as to ensure the safe use. In this FEM study, thestress-strain response of each contact surface is modeled by hyperbola, and several vitalparameters affecting geomembrane stress are analyzed. The results show that with theincrease of the slope angle, the internal forces of geomembrane gradually climb beforedecrease rapidly. It will cause significant growth in geomembrane internal forces whenheight of slope segment rises. Variations, in elastic modulus of the geotextiles or thicknessof the geomembrane, can cause approximately linear changes of internal forces ingeomembrane. The calculation methods and the parameter impacts on geomembraneinternal forces will be of significant reference value for waste landfill design.