AN EXPERIMENTAL STUDY TO EVALUATE FREEZING EARTH PRESSURE

概要

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In recent years, LNG (Liquefied Natural Gas) has been used in Japan. Because LNG is stored at a very low temperature (-162℃), the use of LNG underground tanks presents new geotechnical problems, such as thermal analysis of the soil around the tank, the mechanical properties of frozen soils and an evaluation of freezing earth pressure.This paper describes two kinds of tests undertaken to evaluate freezing earth pressure in stiff cohesive soil, for the purpose of checking an assumed design pressure adopted for the first LNG underground tank in Japan. This checking study comprises a preliminary laboratory test carried out to obtain an approximate value of freezing earth pressure and subsequently, a field test carried out on a model tank 2 m in diameter and 1 m high. An estimated value of maximum freezing earth pressure was obtained from the result of the field test, and it compared well with the results of analysis by the two-dimensional theory of elasticity. The relevance of the use of this experimentally obtained maximum value of freezing earth pressure seems to be proved, to some extent by the fact that the prototype LNG tank designed fortuitously on this value, has performed well for 10 years.
社団法人地盤工学会の論文
1983-09-15