Translation Failure Analysis Of Landfill And The Laboratory Experimental Investigation On Density Of Refuse

According to the analyzing the composition of refuse in landfills, the composition of refuse sample is determined and the experiments are carried out in lab to investigate the influence of composition, compaction effort, water content and pressure to density and dry density of refuse. The results show that the density and dry density are increasing with the increase of compaction effort. And the relationship between dry density and compaction effort can be expressed by a log function in which the interception indicates the influence of composition of refuse. The rule of the compaction curve of refuse is consistent with the general soil. The density is increasing with the increase of pressure, but the rate of increase slows down significantly after pressure reaches a certain value which is relevant with the initial density and compaction effort. Initial dry densities in a same composition are different with the compaction efforts and water contents, but the values tend to same with the increasing pressure.The stability on active wedge and final cover of landfill is impotent in construction of landfill. There are many methods for studying stability. The most used method is limit equilibrium analysis including two wedges analysis, infinite slope, full equilibrium methods and etc. The methods are compared to find the differences. The results show that the safety factor calculated by infinite slope is smallest because the resistance on slope feet is ignored due to the assumption of infinite slope and the geo-membranes tensile of slope isn't considered. The safety factor calculated by full equilibrium method is a biggest one because the geo-membranes tensile on slope and the resistance of slope feet are both considered. The safety factor calculated by the method of two wedges is between the others because the geo-membranes tensile of slope is not considered while the resistance of slope feet is considered in the method.The translation failure is studied in this paper. A limit equilibrium analysis is used to calculate the factor of safety for landfill translation failure along the underlying liner system. The landfill is divided into three parts: an active wedge lying on the back slope that tended to cause failure, a passive wedge and waste dam resting on the foundation or liner system that helped to resist movement. In addition, we set a mode of three parts wedge of trapezia, the friction between passive and waste dam can be considered in this mode, and the shape of waste dam is able to change, solution the factor of safety, the influence on stability is studied in this mode. With the increasing of the back slope angle of waste dam, the factor of safety FS was decreased; There is a little variety on the factor of safety FS with the change of friction angle between waste dam and passive wedge; The factor of safety FS was increased with the increasing of height of waste dam; It was found that the retaining wall significantly affected the stability of landfill,the calculate result were be conservative if the effect of waste dam weren't considered.Because of landfill is always big and used in a long time, so landfill needs to be filled in sequence and needs to be manage effectively. It is important to assure the stability of cell. When cell of landfill is designed, every cell will be save if make sure the value about B/H in a acceptable range, and some parameter likeα,β,γSW,θ,δis no change.