CORRELATION STUDY OF ROCK BURST TENDENCY AND ULTRASONIC VELOCITY
ZHANG Zhizhen1，2，GAO Feng1，2，LIN Bin2，TIAN Zhili2
(1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221008，China；2. School of Mechanics and Civil Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China)
Abstract：A quantificational formula between ultrasonic velocity through rock specimens and rock burst tendency with increasing strain is deduced，and it is proved reliable based on the test results of three different kinds of rock specimens under uniaxial compression. The results show that：(1) When rock burst tendency is strong，the ultrasonic velocity almost keeps constant as the strain increases in forepart of loading，and declines suddenly at the point of 90% peak strength；when rock burst tendency is weak，ultrasonic velocity declines gradually during the whole deformation process. (2) A new conception called attenuation factor of ultrasonic velocity is put forward to represent the rock burst tendency，and the classification criterion is suggested. (3) The wave velocity test is conducted in three different kinds of rocks on burst tendency under uniaxial compression，and the test data fit the quantificational formula well.
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2012, Vol. 31 
