The Results of the investigations on rock mechanics in HDB-911 boreholes and update of the rock mechanical model around the Horonobe URL construction area

Sanada, Hiroyuki; Niunoya, Sumio*; Matsui, Hiroya 

The investigations of Horonobe URL (Underground Research Laboratory) project is subjected of the siliceous rocks in Horonobe-cho Teshio-gun Hokkaido. This research report shows the result of the rock mechanical investigations which have been carried out from 2004 to 2005 as a part of the project. The objectives of the rock mechanical investigation are follows to obtain the data which were necessary for construction design of URL and to confirm the distribution of rock mechanical properties in URL construction area. Considered result acquired from this investigation, when we tried to update the rock mechanical model, there was no point of main policy change in the model.