Behaviour of a slide area at a Lisbon's MSW landfill after implementation of stabilizing measures

Abstract

The paper describes the stabilization measures and the monitoring scheme adopted for the Eastern Expansion of Beirolas Municipal Landfill, in Lisbon. ln June 1995, this expansion was affected by a large landslide during construction, caused by a design misevaluation of the degree of consolidation and strength of the foundation soft clayey soils. Remedial measures after the failure included slope grading, installation of vertical drains and placement of a surcharge fill. The results of the instrumentation and in situ tests were used to analyse the behaviour of the area after implementation of these measures. The monitoring plan adopted provided an efficient warning system and enabled to assess the effectiveness of the treatment.