ABSTRACT:

The deformation stability and control theory based on viscoelastic, viscoplastic and viscodamage models is developed to simulate time-dependent deformation and quantitatively evaluate the long-term stability of gas storage caverns in salt rock. A quantitative criterion for the long-term stability evaluation in the spatial-temporal non-equilibrium evolution process of gas storage caverns is established based on the T~?E curve, where T is time and ?E is plastic complementary energy (PCE). The T ~ ?E curve provides a unified quantitative criterion of stability evaluation under various external disturbance factors. The driving force of the spatial-temporal non-equilibrium evolution process is revealed and its engineering value is demonstrated especially for reinforcement design. PCE is the quantitative indicator of instability. Over force is the internal effective driving force of unrecoverable time-dependent deformation or damage evolution during the spatial-temporal non-equilibrium evolution process. Deformation stability and control theory is implemented by finite element method to analyze the time-dependent deformation, long-term stability and local failure of gas storage caverns in salt rock. It is indicated that deformation stability and control theory proposes a more effective stability evaluation criteria of gas storage caverns in salt rock.

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