Tome Architecture and management of a geological repository - Andra

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4 - General architecture of the repository in a granite mediumFigure 4.2.10Construction principle of a drift sealDossier 2005 Granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY74/228
4 - General architecture of the repository in a granite medium• Backfilling the repository driftsUpon drift closure decision, they are fully backfilled. The current thinking is that in principle the lowpermeability performance of the backfill must be at its most efficient when emplaced in drifts close tothe disposal cells or in the vicinity of the seals. The low permeability backfill considered is made up ofgranite aggregate and swelling clay, and mechanically compacted while emplaced. It should bepossible to use standard backfill with or without a small amount of swelling clay in those drifts locatedfar away from the disposal cells and if, in between, are already present, in redundancy, lowpermeability backfills and seals.Interruption of the damaged zone at the excavation wall during the excavation works can be envisagedas additional means for enhancing backfill performance in the drifts where low permeability backfill isto be emplaced. This interruption could consist of cutting trenches on the edge of the drift using nondamagingmethods (cf. excavation of seal zones).The backfill specifications including the addition of swelling clay (granular/clay fraction, type of clay)and the emplacement and compacting methods envisaged at this stage are based on the solutions testedby SKB in Sweden [18].By using a clay fraction (between 10% and 30% of the volume) the backfill permeability level asmeasured in the laboratory can be brought down (10 -10 and 10 -12 m/s respectively), while providing atthe same time swelling properties. The granulated fraction adds mechanical strength to the backfill.SKB has already resolved most of the difficulty of backfilling the upper part of a drift by developing amachine fitted with a vibrating plate mounted on a mobile arm. This machine can emplace andcompact the backfill in continuous layers dipping from the drift vault down to the slab floor (Figure4.2.11).The main purpose of compacting is to increase backfill density to enhance its permeabilityperformance. During the "Backfill and Plug Test" experiment, the densities obtained after compactinga backfill with 30% bentonite content, varied from 1.7 in the drift centre to 1.5 at the edge.Future measurements will verify the permeability obtained by the backfilling operation for whichcorrelations have been established in the laboratory (density ≈ 1.7/permeability ≈ 1.10 -12 m/s; density ≈1.5/permeability ≈ 5.10 -10 m/s).Figure 4.2.11Emplacing and compacting low permeability backfillDossier 2005 Granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY75/228
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Contents4.1 Surface installations..
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Contents7.2.1 Harnessing the favour
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ContentsFigure 5.1.7 Non-alloy stee
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ContentsFigure 7.6.3 CU package emp
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11Study approach1.1 The main stages
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1 - Study approachSome studies were
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1 - Study approachIn France spent f
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2 - High-Level and Long-Lived waste
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2 - High-Level and Long-Lived waste
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5 - B waste repository zoneLinéair
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5 - B waste repository zoneThe pack
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5 - B waste repository zonePosition
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5 - B waste repository zoneTable 5.
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5 - B waste repository zoneDossier
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6 - C waste repository zone66 C was
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6 - C waste repository zoneFigure 6
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6 - C waste repository zoneTable 6.
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6 - C waste repository zoneA value
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6 - C waste repository zoneA thickn
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6 - C waste repository zone6.3.3.2
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6 - C waste repository zoneFor the
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6 - C waste repository zone• Seal
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6 - C waste repository zone6.6 Disp
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6 - C waste repository zoneCOMPONEN
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7 - Spent fuel repository zoneSpent
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7 - Spent fuel repository zoneMater
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7 - Spent fuel repository zone7.1.3
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7 - Spent fuel repository zoneSKB
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88Conclusions8.1 Generic architectu
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8 - ConclusionsThe envisaged two-le
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Références bibliographiquesRefere
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Références bibliographiques[39] A
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Photo Credits:ANDRA - SKB - NAGRA -
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Tome Architecture and management of a geological repository - Andra

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