The Mechanical Behavior Of Salt Rock And Its Application On The Natural Gas Storage Construction

Salt rock has very low penetrability and good creep behavior, and can ensure the leak tightness of the natural gas storage. In addition, its mechanical behavior is steady, and can adapt well to the variety of the pressure in the storage. So the salt rock layer in the stratum is the preferential medium to store the natural gas and the high-radioactive waste. Considering the characters of salt rock that there are plentiful impurity and mudstone interlayers in the salt mines in China, the mechanical behavior of salt rock and the key technique of natural gas storage constructing are investigated on the natural gas storage in Jintan salt mine in the XiQiDongShu project. The main research work of this dissertation is as follow:1. The strength behavior research of salt rock: The strength parameters of salt rock are obtained by the uniaxial and triaxial compressing experiment. The strength character of salt rock is also analyzed.2. The creep behavior research of salt rock: The creep strain law of salt rock is studied by the uniaxial and triaxial creep experiment. The creep behavior is also compared between the salt rock, salt rock with mudstone interlayers and the mudstone.3. The creep damage constitutive law research of salt rock: The creep damage constitutive law of salt rock in Jintan salt mine is established by the theoretical and experiential method. The constitutive law can embody the steady creep and the accerlated creep of salt rock.4. The application research of salt rock creep constitutive law: The creep damage constitutive law is combined with the three dimension numerical method and is applied in the natural gas storage analysis. The evolvement law of damage bound and the displacement law around the natural gas storage are studied by the creep damage constitutive law.5. The optimized research of natural gas storage shape in the salt rock layer: The comparison research is done between different storage volumes and shapes. The difference of yielded or destroyedzone around storage and convergence law are obtained. Based on the research results, the optimal storage shape is presented.6. The brine-extracted caverns available evaluation of Jintan salt mine: The six...