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A model tank test using artificial ground freezing — with an in-ground lng storage tank in view |
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| Authors: | Tetsuo Akiyama Mizuhito Iguro |
| Institution: | a Sodegaura Works, Tokyo Gas Co., Ltd., Tokyo, Japan b Shimizu Construction Co., Ltd., Tokyo, Japan |
| Abstract: | As a clean form of energy able to replace oil, the demand for LNG (Liquefied Natural Gas) has been increasing. LNG must be stored in a cryogenic temperature of —162°C. The storage tanks now existing throughout the world can be divided into above-ground and inground types. In the Tokyo area, there are now 22 in-ground LNG storage tanks, either in operation or under construction, which are constructed with primary consideration given to safety and earthquake-proof design because of the circumstances around the LNG terminals. In the feasibility study of a very large-scale, in-ground LNG storage tank, comparative preliminary studies were made of various construction methods. Among them, the method using artificial ground freezing was proposed, in which it was planned to utilize the frozen soil as the means of ground water control and the temporary retaining wall. To confirm the feasibility of the design, a model tank test was conducted by freezing the actual tank yard. The yard ground, composed of sand and silt layers, was artificially frozen 10 m in diameter and 50 m in depth; in the frozen soil a shaft of 4 m in diameter was sunk to a depth 26 m below the ground level for various tests and measurements. The purpose of the test was mainly to confirm the construction method and to examine the agreement between theory and practice. Although this construction method has not been adopted in the actual tank work, the feasibility of the method itself has been confirmed as a result of the test. In this paper, the outline and major results of the test and analysis are described. |
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