Description

Fracturing of bedrock due to high stresses or stress concentrations.

SKB Number

SKB FEP Number

Ge07

Main Category

Main category for FEP

Internal process

System Component

System component to which the FEP applies

Geosphere

Handling

Explanation of how the FEP is treated

Excavation/operation: Assessment of EDZ. 3DEC modelling of potential for spalling. Observations of size and shape of fractured (spalled) zone around deposition holes. Temperate: 3DEC modelling of potential for spalling. Observations of size and shape of fractured (spalled) zone around deposition holes. Periglacial: Thermal effects modelled and neglected provided that only marginal changes in mechanical state occur. Assessment of hydraulic fracturing under impermeable permafrost layer. Glacial: 3DEC modelling of potential for fracturing induced by ice load (near field). Assessment of risk of hydraulic fracturing. Earthquakes: Neglected based on lack of observations at relevant distances from earthquake faults of earthquake-induced damage around open tunnels at shallow depth.

References

Bibliographic references to obtain more information

SR-Site Geosphere process report, TR-10-48, Section(s) 1.6, 4.4; SR-Site Main report, TR-11-01, Section(s) 7.4.5