ONKALO is a rock characterisation facility for future geological nuclear waste disposal purposes. The excavation of ONKALO is currently at the bottom level, at around 430 metres from ground level. At these depths, it is important to be able to predict the extent and probability of rock spalling. When secondary stresses at the excavation boundary exceed the rock mass strength, a brittle failure occurs that is often called “spalling”. The spalling phenomenon occurs as a strong compressive pressure induces crack growth behind the excavated surface and buckling of thin rock slabs. In this environment spalling is an event that can create problems, not so much for the overall stability of all of the excavations, but rather in particular areas that can cause unnecessary and unintended over-excavations and hazards.
Details
| Title | Numerical Assessment: Crystalline Rock Design of Onkalo Rock Facility |
| Pages | 10 |
| Language | English |
| Format | |
| Size | 1 MB |
| Download Method | Direct Download |
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