INFLUENCE OF WASTE AND SUBGRADE SETTLEMENT ON LANDFILL LINIER STABILITY AND INTEGRITY

摘要

The design of landfill on soft sub-grade should consider the stability of the waste and sub-grade. Because of the waste and subgrade settlements, the long-term integrity of the lining system also should be taken into account during the design period. A landfill built on soft soil foundation was analyzed, both global stability and local failure resulted from the loss of lining integrity due to the waste and subgrade settlement were considered here. Limit equilibrium technique was used as a method of assessing the global stability of landfill. Results presented in this paper demonstrate that traditional limit equilibrium technique is uncapable to assess local failure. The assessment of integrity requires knowledge of the interaction between components of the lining system and the waste body as it settles.Numerical model was used to assess local instability. The results show that the differential settlement of sub-grade influences the waste stability and the lining system integrity.