چكيده به لاتين
Proper determination of dynamic characterization of municipal solid waste, especially in regions with high seismicity, is of a great importance in stability assessment of landfills. Also, the response of Municipal Solid Waste (MSW) under dynamic loadings is found to be significantly affected by the fibrous material. Due to the above reasons, a comprehensive strain–controlled cyclic triaxial testing program was performed on MSW samples retrieved from a landfill in Kahrizak area, Tehran province. The tests were conducted on fresh MSW specimens (the diameter of 100 mm) with different percentage of fibers in Cu condition. Therefore, the probable reinforcing capability of fibers and their impacts on changes of MSW composition were investigated under the variation of different factors such as confining pressure, loading frequency, Poisson’s ratio, and loading cycle. Based on the results of this study and irrespective of different testing conditions, the increment of fiber content in specimens lead to a more elastic behavior of MSW under dynamic loadings so that the normalized shear modulus reduction curves shifted to the right while the damping ratio curves showed an unclear trend. However, the impact of fiber contents, confining stress and shear strain on variation rate of normalized shear modulus reduction values should be considered simultaneously. This trend can be attributed to the higher values of stiffness by changing the composition in comparison with the generated one by obtained reinforcement within the studied strain range. In general, due to lack of systematic evaluation on the effect of the fibrous waste materials on dynamic response of MSW, the current study can be useful to provide additional insight for seismic analysis of landfills
