Analysis of geosynthetic lining systems (GLS) undergoing large deformations

Abstract The barrier systems used for the sloping sides of waste storage facilities are made up of different geosynthetic and mineral components. The distribution of forces within each component is complex and results mainly from the deformability and frictional interaction between components. One of the objectives of this composite system is to allow a separation of the functions of the different geosynthetics: stability is guaranteed by the geotextile (GT) while the geomembrane (GM) acts as the sealing layer and must be subjected to the minimum possible tensile stress. To help in the design of this type of structure, a finite-element modelling system was adapted to deal with the large deformations monitored in the field. The finite element results are compared with the experimental results obtained at an instrumented site. An analysis of the observed behaviour and a parametric study are presented to aid in understanding the role of each of the components of the system.