Abstract
Rock behaviour conditions the stability of deep underground exploitations. The excavations generate deformations, damage, and fractures in the surrounding rock. At engineering scale, phenomenological constitutive models are often considered; however, macroscale behaviour takes its origin from small-scale properties. Their influence on material deformations and damage across scales remains complex. Therefore, the behaviour of a clay rock is modelled at two scales. The excavation and damaged zones around galleries are reproduced at large scale. The excavation-induced fractures are modelled with shear bands. The approach is enriched with microstructural characteristics of mineral inclusions and clay matrix. The material mesostructure and behaviour are embedded in a representative elementary volume. A double-scale numerical framework (FEM×FEM) with computational homogenisation relates small-and large-scale behaviours, as deformations and failures. The damage and cracking developments at micro/meso scales allow to predict macroscale shear banding. The results highlight the possibilities of double-scale computing to predict underground structure behaviour.
Original language | English |
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Title of host publication | Challenges in Rock Mechanics & Rock Engineering |
Editors | W. Schubert, A. Kluckner |
Place of Publication | Salzburg |
Publisher | Austrian Society for Geomechanics |
Pages | 1711-1716 |
Number of pages | 6 |
Publication status | Published - Oct 2023 |
Event | 15th International ISRM Congress & 72nd Geomechanics Colloquium - Salzburg Congress, Slazburg, Austria Duration: 9 Oct 2023 → 14 Oct 2023 https://www.isrm2023.com/en/ |
Conference
Conference | 15th International ISRM Congress & 72nd Geomechanics Colloquium |
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Country/Territory | Austria |
City | Slazburg |
Period | 9/10/23 → 14/10/23 |
Internet address |
Keywords
- Damage
- shear failure
- double-scale modelling
- microstructural characteristics
- excavation