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Stability analysis of the oil surrounding rock in oil storage cavern by Modified Hoek-Brown strength reduction method

Benfu YU  Yifei YAN  Lisong ZHANG  Xiangzhen YAN  
【摘要】:正The failure of surrounding rock in oil storage cavern can be seen as the processes that the deformations of rock cavern convert from continuous gradual change system to catastrophe state,which are typical nonlinear catastrophe problems.Considering the nonlinear failure characteristic of surrounding rock,the catastrophe model is proposed to obtain the stability factors of surrounding rock based on modified Hoek-Brown strength reduction method and catastrophe theory.It can improve the accuracy of stability factors obtained by numerical simulations.A comparison of this model with the result calculated by the existing computation example is made. In addition,the influences of cavern depth,cavern spacing,pore pressure,and time on the stability factors are studied.The results showed that the model is precise and correct,and can meet the actual engineering demands.The stability factors are equidirectional with the increase of cavern spacing,but reverse to the increase of cavern depth,pore pressure and time.

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