Abstract
With the changes in China’s energy demand, the proportion of liquefied natural gas (LNG) is expected to account for 10% of the country’s total energy resources by 2020; thus, the demand for large storage tanks has become urgent. However, all LNG storage tanks in China are located aboveground, with no precedent set for fully- or semi-underground storage tank implementation. Therefore, the present study analyzes the displacement and pore water pressure characteristics of underground LNG storage tanks under anti-floatation conditions based on the construction of a 250,000 kL underground storage tank that is 91 m in diameter and 42 m in depth. Centrifuge tests were conducted to explore the development laws of displacement and pore water pressure of the bottom plate under different load conditions for fully- and semi-underground tanks. The displacement response of the tank under the flotage condition clearly exhibited three-stage characteristics, that is, the safe, dangerous, and failure stages. The development laws of each stage were then summarized, analyzed, and explained by numerical and analytical calculations to provide a theoretical basis for storage tank design and anti-floatation monitoring.
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