论文部分内容阅读
79年采选系采矿专业招收了一名研究生,经过三年多的学习和科学研究。成绩合格;最近又进行了《单轴压缩下岩石试件声波的频谱特性的研究》的论方答辩。该研究生主要是研究了单轴压缩下岩石试件内声波的频谱特征。他采用矽卡岩和花岗岩两种岩石试件进行单轴压缩试验,并监测了沿加截方向试件内传播的声波波速和首波波辐。同时对声波记录进行了测幅取样,计算了相应的功率谱,并在一定范围内将功率谱作了平均。通过大量试验结果表明: 在岩石试件的裂隙闭合,线弹性以及裂纹扩展阶段,平均随的变化趋势与首波波幅基本一致:在试件的扩容阶段,则平均值出现较大幅度的波动,部分试件的平均值出现较
In the mining department of the mining department in 1979, a graduate student was recruited and after more than three years of study and scientific research. Qualified; recently, he has answered the “Study on the spectral characteristics of sound waves of rock specimens under uniaxial compression”. The graduate student mainly studied the spectral characteristics of acoustic waves in rock specimens under uniaxial compression. He used uniaxial compressive tests on skarn and granite rock specimens, and monitored the acoustic wave velocity and the first-wave dispersion propagating along the shear direction. At the same time, amplitude sampling was performed on the acoustic wave recording, the corresponding power spectrum was calculated, and the power spectrum was averaged within a certain range. Through a large number of test results, it shows that in the crack closure, linear elasticity and crack growth stage of rock specimens, the average change trend is basically consistent with the amplitude of the first wave: in the expansion phase of the specimen, the average value fluctuates greatly. The average value of some specimens appeared