In situ strength and failure mechanisms of migmatitic gneiss and pegmatitic granite at the nuclear waste disposal site in Olkiluoto, Western Finland

The primary goals of the experimental work described in this paper were to establish the in situ spalling/damage strength of the intact rock, to establish the state of the in situ stress, and for the work to act as a Prediction–Outcome exercise within the context of confirmatory underground site investigations being conducted at the nuclear waste disposal site at Olkiluoto, in Western Finland. To establish the in situ mechanical properties,...