![]() The authors present the formulation of a dual-structure model and describe its implementation into a coupled fluid flow and geomechanical numerical simulator. In order to simulate these characteristics of expansive soils, a dual-structure constitutive model that includes two porosity levels is necessary. In addition to their swelling capacity, expansive soils are characterized by accumulating irreversible strain on suction cycles and by effects of microstructural swelling on water permeability that for backfill or buffer materials more » can significantly delay the time it takes to reach full saturation. 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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January 2023
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