2022 Volume 64 Issue 1 Pages 5-20
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.
