Abstract
The freezing–thawing damage of rock mass involves the coupling of temperature field, seepage field and stress field (THM) at low temperature. Based on water/ice phase transition theory and energy conservation principle, the expression of freezing rate is obtained. According to the law of conservation of mass, the law of conservation of energy and the principle of static equilibrium, the coupling governing equation of THM of fractured rock mass under freezing condition is obtained by using the dual-porosity medium theory. An example of underground LNG storage in low temperature condition is used to verify the proposed THM coupling model. The surrounding rock is regarded as a system composed of rock blocks and fracture media, and the equivalent thermal expansion coefficient method is used to simulate the frost heaving effect of ice-filled fractures. The influence of freezing process on the permeability coefficient of rock mass is considered in simulation. The distribution of temperature, stress and pore pressure under THM coupling condition at low temperature is studied.
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12 January 2023
A Correction to this paper has been published: https://doi.org/10.1007/s10706-022-02366-5
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This work was supported by the National Key Research and Development projects of China (Grant No. 2021YFB4001405). This support is gratefully acknowledged.
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Zhang, C., Duan, P., Xiao, H. et al. A Fully Thermo-Hydro-Mechanical Coupling Simulation at Low Temperature in Underground LNG Storage. Geotech Geol Eng 41, 1019–1029 (2023). https://doi.org/10.1007/s10706-022-02320-5
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DOI: https://doi.org/10.1007/s10706-022-02320-5