基于龄期影响的垃圾填埋体边坡稳定性分析.

In the process of landfill and operation, the shear strength of municipal landfill will change with the increase of age, and the stability of landfill itself will also change. In this paper, the analysis of shear strength parameters of garbage soil by domestic and foreign scholars was made, and the variation of cohesion and internal friction angle with age increasing was summarized. If the material of the landfill is similar, the cohesive force tends to decay with quadratic function while the internal friction angle increases with logarithmic function;moreover,after 10—15 years of landfill,the cohesion approached zero and the internal friction angle increases by 15°—25°．Then a layered landfill model was established,and the shear strength parameters related to age were given to each landfill layer.Finally,PLAXIS finite element software was used to analyze the slope stability of landfill at different ages.The stability safety factor decreases first and then increases with the age increase.The displacement is mainly concentrated in the middle of the slope while the settlement is mainly concentrated in the top of the slope.During the operation of landfill,attention should mainly be paid to the change of slope displacement and the safety of landfill around 10 years after sealing.The research results have obvious engineering significance for landfill design and site safely. [ABSTRACT FROM AUTHOR]