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Abstract Rock mass unloading in riverside is a familiar geological phenomenon in hydroelectric project slope，it has important significance with regard to stability of rock mass slope，as well as relevant rock engineering problem. Unloading zone quantitative classification is always high lightened by hydroelectric project survey and design，it is common to use quantitative index to reflect rock mass structure characteristics despite of many other index used for unloading zone quantitative classification. According to hydroelectric engineering practice，this paper discussed the problem how to classify quantitative index for rock mass unloading zone in riverside，and proposed to use width of opening fissures，total width of opening fissures and ratio of wave velocity as quantitative index for rock mass unloading zone in riverside.
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Received: 18 April 2012
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2012, Vol. 31 
