Architecture and management of a geological repository - Andra

Ventilation of a 250-m long cell requires supplying fresh air at one end and retrieving exhaust air atthe other end.Several solutions may be considered to restore ventilation. One solution is to drill an air drift builtspecifically for package retrieval, thus removing the air through the bottom of the cells (Figure 10.4.5and Figure 10.4.6).Figure 10.4.5Top View of Airway with AntennasFigure 10.4.6Construction of the Ventilation AirwayDeconstructing the Seal and Reconditioning the Access DriftRestoring the access drift to its operating condition consists in clearing the seal down to the liner, thenre-installing the same equipment as was used for waste package emplacement. A roadheader typemachine is suitable for removing the materials from the seal (compacted clay and concrete) withoutadversely affecting the liner of the drift. The liner portions dismantled at the grooves are reconstructedusing formed concrete. The areas of the liner with surface roughness after the boring operation can berepaired using standard civil engineering techniques.DOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM423/495