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Mikake, Shinichiro; Sato, Toshinori; Nobuto, Jun*; Akita, Tetsushi*; Nishigaki, Makoto*
no journal, ,
In radioactive waste disposal, grouting technology is expected to reduce ground water inflow, not only to execute construction and operation securely in deep underground and protect surrounding environment, but also to secure barrier capacity. Here, a grouting methodology is studied to achieve high-level sealing effect in disposal tunnels in hard rock by pre-grouting, by reviewing grouting methodologies utilized in water tight tunnels in Northern Europe. The result indicates that boring injection holes shortly and densely is superior in sealing efficiency and economical view point.
Mikake, Shinichiro; Sato, Toshinori; Nobuto, Jun*; Akita, Tetsushi*; Nishigaki, Makoto*
no journal, ,
Since suspension grouts to be used in radioactive waste disposal have tendencies to be dense and viscous, grout is concerned to clog at the entrance and narrowing part of fractures due to filter cake. Clogging could be influenced, not only by grout material properties, but also injection method: injection pressure. Here, the influence of injection pressure on clogging phenomena was investigated using newly developed test apparatus which can withstand high injection pressure. The test results indicated the possibility to prevent clogging by using high injection pressure.