Architecture and management of a geological repository - Andra

6 – Overall underground architecture• Progression of workFigure 6.4.2Construction and operation phases of a c waste repositoryStarting at the the entrance to a zone, operating unit work progresses from one side only of theconnecting infrastructure, moving away from the shafts ("advancing" in mining terminology). Oncethe end of the connecting infrastructure is reached, work continues on the other side back towards theshafts ("retreating" in mining terminology). This approach is illustrated in Diagrams 1 and 2 of Figure6.4.2. The combination of advancing and retreating methods inside the same sub-zone simplifies themanagement of simultaneous construction and operation activities as it prevents the flows ofconstruction and operation from interfering with one another. This method is currently used in anindustrial situation in the WIPP (United States) 109 .The connecting infrastructures are also constructed progressively before the construction of workunits. This progression is illustrated in Diagrams 2 and 4 of Figure 6.4.2 and may vary depending onthe organisation of work.109 If the intensity of work and operation is relatively low, as in sub-zone 1 of zone B, an entirely "advancing" strategy is foreseeable.DOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM272/495