Research on freezing ring of Liquefied Natural Gas (LNG) storage based on multi-coupling theory under low-temperature

摘要

Storing liquefied natural gas in underground caverns is a forward-looking international issue. The surrounding rocks of LNG storage undergo a thermohydro-mechanical multi coupling effect during the construction and operation processes. According to the experimental mechanical parameters of some granite specimens under low temperature, the numerical simulation was executed to study the development of freezing ring around the storage based on the multi-field coupling theory under lowtemperature. The research results showed that the freezing ring would become thicker and thicker gradually with time and the thickness of freezing ring would be stable after about 20 years of construction. At last, the fitting relations between the thicknesses of freezing ring at different positions of storage cavern and the operation time were acquired.