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Takuya OHYAMA,Hiromitsu SAEGUSA,Ryuji TAKEUCHI,Shinji TAKEUCHI,Toshiyuki MATSUOKA 한국암반공학회 2009 한국암반공학회 학술대회 및 세미나 자료집 Vol.2009 No.10
In the Phase II investigations, the long-term hydraulic monitorings, such as groundwater pressure monitoring, tiltmeter measurements and analyses and self potential monitoring, were carried out to characterize hydrogeological structure in the hydraulically disturbed condition due to the MIU construction. The investigation results indicate the faults in/around the MIU construction site have a low or anisotropic conductivity (normal direction to fault plane: low conductivity, in-plane direction to fault plane: high conductivity). The geological mapping of the shafts and galleries revealed that a fault with altered granite was intersected by the Main shaft12). This result is consistent with the results of the characterization of hydrogeological structure using the hydraulic monitoring. It was also characterized that horizontal layer or layers in the sedimentary cover act as flow barriers as well as the faults. There is also the rock volume that is bounded by and hydrogeologically isolated by these hydraulic structures. The result of the groundwater flow analysis using the revised model based on the above investigation results indicates that the head distribution and inflow rate are significantly influenced by the hydrogeological structures modelling. Therefore it is very important to construct appropriate geological and hydrogeological models based on the investigation results. It is also important for site characterization to combine the field investigations and simulations.