ROCK BURST AND CLASSIFICATION OF SURROUNDING ROCK MASSES

Rock burst is a type of instability of hard intact surrounding rock in the condition of high field stress.The relations between rock burst intensity and surrounding rock rating are not known clearly.It is very important to find the relations between rock burst and surrounding rock classification in the high field stress.In this paper,some problems such as the relations between rock burst intensity and surrounding rock rating,the choice of the criteria of rock burst for water resources and hydroelectric underground excavation in China are discussed.An example for surrounding rock mass classification of a deep-buried tunnel in China is given.A suggestion that the relations between rock burst intensity and surrounding rock rating should be increased in national correlation criterion is proposed.