The expansive soil should provide enough swelling capacity to support the tunnel walls, thereby reducing the impact of the excavation-damaged zone on the long-term mechanical and flow-barrier performance. The canisters containing nuclear waste would be placed in tunnels excavated at a depth of several hundred meters. We implemented the BBM into TOUGH-FLAC by (1) extending an existing FLAC,Įxpansive soils are suitable as backfill and buffer materials in engineered barrier systems to isolate heat-generating nuclear waste in deep geological formations. This paper presents the implementation of the Barcelona Basic Model (BBM) into the TOUGH-FLAC simulator analyzing the geomechanical behavior of unsaturated soils.
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