NUMERICAL ANALYSIS OF EFFECT OF TEMPERATURE DECREASING ON CRACK OF CHILLED LPG UNLINED STORAGE CAVERN

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Abstract Through a single crack，the main cracks appeared in the wall and imbedded near the wall of cavern are simplified as a half infinite plane with a fringe crack and one with a crack near the free edge for chilled liquefied petroleum gas(LPG) storage cavern respectively. To explore the influence mechanism of temperature decreasing on crack propagation，firstly the effect of rock parameters change caused temperature decreasing on the crack propagation is analyzed. Secondly，the effects of temperature boundary type，intensity and velocity of temperature decreasing，and angle between crack and wall on the temperature fields，stress fields and the stress intensity factors(SIF) of cracks with different lengths are researched. Finally，as a tentative research，the inhibition action of the ground stress on crack propagation during the temperature decreasing of crack is taken into consideration through the principle of superposition；and the relationship between the of temperature storage medium and the ground stress of cavern is analyzed under the condition of the existent crack non-propagating.

Key words： rock mechanics chilled liquefied petroleum gas unlined storage cavern crack temperature decreasing stress intensity factor

Received: 15 September 2010

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http://www.rockmech.org/EN/Y2011/V30/I4/718

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