岩石冲击倾向与其波速变化的相关性研究

为探求岩石受载过程中波速变化规律与其冲击倾向的关系，建立单轴压缩下不同冲击倾向岩石波速随变形的变化关系式，并通过实验室试验对其进行初步验证。研究结果表明：(1) 当岩石冲击倾向性较强时，随着应变量的增加，波速开始基本没有变化，当所加荷载达到约90%峰值应力后，波速发生急剧下降；当冲击倾向性较弱时，波速基本呈线性降低。(2) 定义波速衰减因子的概念，用来表征岩石冲击倾向性的强弱，并初步确定其判别准则。(3) 对3种不同冲击倾向性岩石进行单轴压缩及波速测试试验，试验结果与理论关系式吻合较好。

CORRELATION STUDY OF ROCK BURST TENDENCY AND ULTRASONIC VELOCITY

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.