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Architecture and management of a geological repository - Andra

Architecture and management of a geological repository - Andra

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7 – The shafts <strong>and</strong> the driftsDBE Technology GmbHFigure 7.4.2Gorleben shaft zone7.4.2 The connecting driftsThe general organisation <strong>of</strong> the connecting drifts <strong>and</strong> the drift layout examples were presented inchapter 6. This section is limited to individual drifts. For information, the access drifts to the cells aredescribed in chapter 5.7.4.2.1 Geometry <strong>of</strong> the connecting drifts, ground support <strong>and</strong> linerAt this stage in the studies, the diameter <strong>of</strong> the drifts was deliberately limited to a section as small aspossible, taking into account the flows passing through these drifts. Except for a few cases, the usablediameter <strong>of</strong> the connecting drifts is 5.7 metres. The section is “horse shoe” shaped. The shape <strong>of</strong> thedrifts is adjusted according to the drift’s direction with respect to the horizontal stress.The ground support <strong>of</strong> the drifts consists <strong>of</strong> 3 m long bolts <strong>and</strong> 20 cm thick shotcrete.In the resemblance <strong>of</strong> civil engineering tunnels, the liner is sized to ensure the drifts a 100-year servicelife.DOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM301/495

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