倉敷国家石油ガス備蓄基地の地下岩盤貯槽における 人工水封システムの水質管理 (Japanese)

In hydraulic containment-type underground storage caverns for liquefied petroleum gas (LPG) or crude oil, sufficient hydraulic potential around the storage caverns must be maintained to seal in the stored material effectively (called "water-sealing function"). At the Japanese national LPG stockpiling site in Kurashiki, a water curtain system that includes tunnels and injection boreholes was installed above the storage cavern; the system injects water to keep hydraulic potential around the storage cavern. To restrain the decrease in the water supply due to clogging, groundwater quality monitoring and water flow performance tests were conducted during the site's construction. Based on the tests and monitoring results, a water quality control method for injection water was formulated to maintain the water supply. With this control method, the water supply was maintained satisfactorily. [ABSTRACT FROM AUTHOR]

石油や石油ガスの水封式地下岩盤備蓄では, 岩盤貯槽中の貯蔵物を地下水の水圧で封じ込める水 封機能を維持するため, 貯槽周辺の間隙水圧の低下を抑制する必要がある。倉敷国家石油ガス備蓄基 地では, 貯槽上部に人工水封システム（水封トンネル及び水封ボーリング）を設置し, 人工水封水を 安定供給することで, 間隙水圧の維持に寄与している。水封トンネル及び水封ボーリングの目詰まり による水封水供給量の減少を抑制するため, 基地建設時に地下水の水質モニタリング及び水封水の 通水性能確認試験を実施し, 供給量維持に必要な人工水封水の水質管理方法の策定を行った。得られ た管理手法により, 水封水供給量を維持することができた. [ABSTRACT FROM AUTHOR]

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