Abstract
To clarify the possibility of underground LPG storage, the temperature-dependence of mechanical properties and frost heaving of rock are expressed as functions of temperature, and a method of heat conduction analysis and thermal stress analysis including material nonlinearity is developed using finite element method. As the result of computations for underground LPG storage, the failure around a rock cavern is produced as tensile failure and frost heaving exerts a great influence on the stability of LPG storage. In thermal stress analysis for underground rock cavern, it is necessary to represent the semi-infinite domain with an infinite element.
