Abstract
The paper discusses the results of in-situ rock shear tests that were examined at 11 sites in Hokkaido. The failure processes and displacement patterns resulting from these were related to the geological conditions.
These are summarized as follows:
1) There aro four types of displacement patterns, defined N type, J type, R type and S type. Each content in total test is 53.1 %, 18.8 %, 17.2 % and 10.9 %, respectively.
2) N-type occoured at the geological conditions which were soft and non clear joint-ie, pyroclastic rocks, Tertiary sedimentary rocks, etc.
The basic friction angles are from 25° to 45°.
3) J-type occoured at the geological conditions which were clear joint-ie. Volcanic rockes, Pre-tertiary sedimentary rocks, etc.
The basic friction angles are from 30° to 40°.
4) R-type occured at the special geological conditions which were very hard and nearly intact rocks.
5) S-type occured also at the special geological conditions which were crashed, or very soft, rock, often by faulting.
