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Development of borehole fracture column and spatial distribution of fracture systems; Case study at the Grimsel test site (GTS, Switzerland)

Tsuda, Hidenori

Regarding grouting of geological disposal repository, geological research that shows the site specific existent condition and aggregation form of rock fractures reached ca.1000 m underground, which buried high-level radioactive waste, is necessary, by a limited number of rock boring survey in the earlier stage of the site investigation. And this fundamental problem holds the key to the success and failure of modeling, design and construction of grouting. This paper introduces rock fractures boring column by simulant real boring core, and attempted to overview of fractures perspective intervening and outer space of borings based on the cross-sectional representation of fractures. Using fractures column, each fracture's location, orientation, and those morphological combination forming fractures aggregate zone are shown systematically. In addition, the relationships between rock fractures and geological features, rock grading are shown in parallel.

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