In-site test of a bentonite pellet backfilling method for prefabricated engineered barrier system module

Mori, Takuo*; Niunoya, Sumio*; Kobayashi, Masato*; Nishimura, Masanobu*; Nakayama, Masashi

Prefabricated Engineered barrier system Module (PEM) is one of option for Radioactive waste emplacement. Narrow gap between Tunnel and PEM must be backfilled with Bentonite, to prevent water permeability. Authors developed Bentonite Pellet Backfilling Method for the narrow gap. In-site test was executed at Horonobe URL -350m. Bentonite Pellet was backfilled two gaps (Minimum width: 110 mm) between an actual size PEM and the Tunnel. A 1.37 Mg/m backfill dry density is achieved. It was proofed that the Bentonite Pellet Backfilling Method is averrable for the Radioactive waste emplacement.

Language	:	Japanese
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Meeting title	:	2019年度土木学会全国大会第74回年次学術講演会
Held date	:	2019/09
Location (city)	:	高松
Location (country)	:	日本
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DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	ベントナイト; 放射性廃棄物処分; 人工バリア; 密度
Research Facility	:	深地層研究所
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Cooperating Institute	:	原子力環境整備促進・資金管理センター

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Registration No. : BB20190104
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