Geofysiikka louhintavauriotutkimuksissa

Excavation damage, specifically its extent and effects on hydraulic conductivity, is one of the key factors when assessing the long-term safety of deep geological disposal of spent nuclear fuel (Mustonen et al. 2010). Posiva Oy has contracted a wide variety of research related to excavation damage, among which geophysics has played a key role especially since 2008. This research includes, among other topics, geophysical measurements in tunnels and drillholes, as well as a comprehensive suite of geophysical laboratory tests. Posiva’s state-of-the-art understanding of excavation damage, observing it, and its effects was recently published as a POSIVA-report (Follin et al. 2021) and as Posiva Working Reports (Kiuru et al. 2019, Heikkinen et al. 2022, Kiuru, 2019, Kovács et al. 2019, Jacobsson et al. 2019) that act as a foundation for the POSIVA-report. This presentation focuses on geophysical laboratory testing (Kiuru et al. 2019) and geophysical tests done in the research site ONKTKU-3620 (Heikkinen et al. 2022).