Abstract
Due to the advantages of low porosity, low permeability, high ductility, and excellent capacities for creep and damage self‐healing, salt rock is internationally considered as the ideal medium for underground storage of energy and disposal of radioactive waste. As one of the most important mechanical properties of salt rock, creep properties are closely related to the long‐term operation stability and safety of salt rock underground storage cavern. A comprehensive review on the creep properties and constitutive model of salt rock is put forward in this paper. The opinions and suggestions on the research priority and direction of salt rock′s mechanical properties in the future are put forward: (1) permeability variation of salt rock under the coupling effect of temperature and stress; (2) damage mechanism and evolution process under the effect of creep‐fatigue interaction and low frequency cyclic loading; (3) microdeformation mechanisms of salt rock and the relationship between microstructure variations and macrocreep behavior during creep process; (4) the establishment of the creep damage constitutive model with simple form, less parameters, easy application, and considering the damage self‐healing ability of salt rock simultaneously.
Highlights
Energy sources such as oil and natural gas are the material basis for the survival and development of the human society and occupy an important strategic position in the national economy
Western developed countries, such as United States, France, and Germany, have built a large number of salt rock underground storages as national strategic energy reservoirs [8,9,10]. e salt rock mineral resources in China are affluent and widely distributed. e proven reserves have been exceeded 4,450 billion tons, and the buried depth varies from tens meters to thousand meters, which provides satisfactory geological conditions for the construction of underground storage cavern (USC) [11]
When confining pressure exceeds 3 MPa, the influence of confining pressure on the steady creep rate of salt rock is obvious weakened. ereafter, as the further increase in confining pressure, the steady creep rate of salt rock is gradually independent of confining pressure, which can be approximately regarded as a function of axial stress
Summary
Energy sources such as oil and natural gas are the material basis for the survival and development of the human society and occupy an important strategic position in the national economy. Western developed countries, such as United States, France, and Germany, have built a large number of salt rock underground storages as national strategic energy reservoirs [8,9,10]. With the implementation of the national strategic energy reserve plan and the Advances in Civil Engineering constructions of Sichuan-East Gas Transportation Project and the West-East Pipleline Project, the construction of salt rock USC in China has begun. As one of the most important mechanical properties of salt rock, creep behavior is a key factor affecting the working life, safety, and stability of salt rock USC [15]. The influences of stress level, loading path, temperature, and mineral composition on the creep properties of pure or bedded salt rock and its microscopic deformation mechanism are summarised. Achievements in the creep constitutive model such as empirical model, component combination model, fractional derivatives model, nonlinear creep model, and damage model considering the damage self-healing ability of salt rock are introduced. ird, the opinions and suggestions on the research priority and direction of salt rock’s mechanical properties in the future are put forward
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