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Abstract For researching the influence of build-cavity-period on the damage of gas storage library?s surrounding rock，combining with the engineering practice，the triaxial unloading confining pressure experiments under different unloading rates are carried out；and the dilatation-damage model and corrects the formula with correction factor of rate are built. The results show that：(1) Under given conditions，salt rock can intuitively response the damage situation at that time. (2) In the experiments，if salt rock specimens experience the same stress path，increasing unloading rate can make the rock of the dilatation amplitude decrease，speed-up-dilatation point lag，the salt rock damage become lesser. So，the damage control more easily. (3) In the same stress condition，we find that different unloading rates will impact the damage of salt rock. The negative logarithm of rate and damage are linearly correlated.
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Received: 12 November 2012
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2013, Vol. 32 
