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Matsui, Hiroya; Yahagi, Ryoji*; Ishizuka, Hikaru*; Toguri, Satohito*
WIT Transactions on Ecology and the Environment, Vol.247, p.145 - 159, 2020/00
In situ backfilling experiment using spray method in the small scale drift (approximately 4 by 3 m scale) was conducted at 500 m depth in Mizunami Underground Research Laboratory (MIU) established by JAEA (Japan Atomic Energy Agency). The backfill material consists of sand and bentonite. Specification for the backfill material was designed to satisfy the target permeability of generic host rock (10
m/sec) assumed by NUMO. In this case, effective clay density should be 0.4 Mg/m
or more. Quality control of the material before backfilling was performed by setting the initial water contents (average 14%) based on the results of the laboratory testing and preliminary spray testing on ground surface. Densities of the backfilled material measured at any points satisfied the specification and the results suggested the establishment of the practical quality control methodology of the backfilling by spray method under actual deep geological environment. The in situ experiment was sponsored by METI (Ministry of Environment, Trade and Industry).
Yahagi, Ryoji*; Ishizuka, Hikaru*; Toguri, Satohito*; Matsui, Hiroya
no journal, ,
This repot summarize about the selection of the material and machines for in-situ experiment for the backfilling in a small scale drift by spray method funded by METI.
Ishizuka, Hikaru*; Yahagi, Ryoji*; Toguri, Satohito*; Matsui, Hiroya
no journal, ,
This repot summarize about the results of the in-situ experiment for the backfilling in MIU by spray method funded by METI.
