Stress, Hydraulic and Coupled Stress-Hydraulic Analysis at Experimental Region in the Tunnel Sealing Experiment

Sugita, Yutaka; Suzuki, Hideaki*; Ito, Akira; Sakai, Yuichi*; Kawakami, Susumu

JNC TN8400 2003-045, 61 Pages, 2004/02

JNC-TN8400-2003-045.pdf:3.28MB

Japan Nuclear Cycle Development Institute has joined the international project, the Tunnel Sealing Experiment, to demonstrate the sealing performance of the full scale plugs in-situ, and to develop analytical method of the sealing performance of the plugs at the Underground Research Laboratory of Atomic Energy of Canada Limited in Canada. We performed the analysis of the sealing performance of the full scale plugs considering the monitored data on sealing performance of the plugs. In these analyses, stress analysis, hydraulic analysis and coupled stress-hydraulic analysis were performed to explain distribution of the pore pressure in host rock and seepage through plugs.Stress analysis showed the stress condition in host around the test tunnel. Hydraulic and coupled stress-hydraulic analyses showed the change with time of pore pressure and seepages considering schedules of opening of the test tunnel, installation of the plugs and pressurizing of the chamber. Since opening the test tunnel caused changes of the pore pressure in host rock around the test tunnel, the coupled stress-hydraulic analysis explained distribution of the pore pressure in the host rock around the test tunnel and seepage through plugs.

Input data of the thermal analysis on the disposal drift and waste package pitch; reference case of disposal tunnel emplacement concept

Kawakami, Susumu; Sakai, Yuichi*; Yui, Mikazu

JNC TN8450 2001-009, 6 Pages, 2002/02

JNC-TN8450-2001-009.pdf:0.1MB

The thermal analysis was carried out to determine disposal tunnel spacing and waste package pitch as parameters and these specification were assumed in reference case in project overview report of second progress report (H12) on researeh and development for the geological disposal of HLW in Japan. This report summarizes the input data of reference. The CD-ROM recording the input data is attached.

None

; Tanai, Kenji; Taniguchi, Wataru; Sakai, Yuichi*

PNC TN8410 95-027, 56 Pages, 1995/02

PNC-TN8410-95-027.pdf:2.88MB

None

Hydraulic calculation for the disposal pannel with consideration of an interaction among sealing materials in geological repositories

Sugita, Yutaka*; Takahashi, Yoshiaki*; Fujita, Tomoo; Kawakami, Susumu; Sakai, Yuichi*

no journal, , 

In this study, three-dimensional simulations of groundwater flow are conducted to investigate the sealing performance of clay-based backfill and plug at the disposal pannel for given hydraulic conditions around the tunnels.