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| The determination method of the "three major elevations" of underground water-sealed cavern |
| JING Shaodong, DU Yinong
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| Engineering Department, China Petrochemical Corporation, Beijing 100728, China |
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Abstract In order to study the determination methods of "three major elevations" in the design of underground water sealed caverns, including the elevation of the groundwater level, the elevation of the water curtain system, and the elevation of the oil storage caverns, a method for determining the "three major elevations" from the perspective of water sealing effect on the bases of a certain cavern project was proposed. The water sealing evaluation was also conducted. The analysis results indicated that the regional groundwater drainage datum plane can be taken as the design groundwater level. The design elevations of the water curtain system and the main caverns need to be determined based on a comprehensive consideration of the water sealing effect, the thickness of the "water cover layer" formed above the storage caverns, and the amount of inflow toward the caverns from the surrounding rocks. According to the calculation model established based on the cavern project, the elevation of the designed groundwater level was 25 meters above the water curtain system, and the water curtain system was 25 meters above the storage caverns. The numerical simulation results showed that it has a good water sealing effect, and small adjustments to these elevation parameters can also ensure water sealing. The "three major elevations" are both the key parameters in storage caverns design and the key factors affecting water sealing.
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Published: 20 September 2024
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