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1 Introduction Thedestructionofrockwasalwaysrelevanttothetimefactor,whichwastypicallymanifestedasthetimedependentgradualbreakingprocess.Thedominantfactorduringthedestructiveprocesswasextensionofmacrocracks,whichhadbeentestedoutbysitesurveyinThreeGorgesPro