Mizunami Underground Research Project, Annual report in the 2004 fiscal year

Watanabe, Tadashi; Amano, Kenji  ; Ikeda, Koki; Iwatsuki, Teruki  ; Saegusa, Hiromitsu; Sato, Toshinori  ; Takeuchi, Shinji

The current geoscientific research of the Mizunami Underground Research Laboratory (MIU) Project have been carried out since the 1996 fiscal year at the Shobasama Site in Akeyo-cho, Mizunami City, Gifu Prefecture. The main goals of MIU Project are to establish appropriate methodologies for reliably investigation and assessing a deep subsurface, and to develop a range of engineering techniques for deep underground application in granite. The surface-based investigations at city-owned land (MIU Construction Site) have started since the 2001 fiscal year. In 2004 fiscal year, deep borehole (MIZ-1) investigations were continued in the MIU Construction Site. After completion of the borehole drilling, Geophysical survey, Rock mechanical test, Groundwater pumping test and Installation of long-term monitoring system were excused. In addition to there groundwater monitoring was carried out using shallow boreholes. Based on these investigations and research, a geological environmental model in/around the MIU Construction Site was constructed to understand the state of the geological environment before shaft sinking. Investigations of Construction Phase, Geological mapping, Reverse vertical seismic profiling, Inflow measurement of groundwater, Analysis of groundwater and Research of the engineering were commenced in/around the MIU Construction Site from 2004 fiscal year. In addition to a research on the engineering technology was continued. In Shobasama site, the hydraulic pressure monitoring and surface hydraulic observation were continued.