中国大陆岩石标本在高压下的弹性波速的初步研究

对10种岩石的20个试件和1个氯化银试件测得了高压下纵波和横波的速度,其中3个试件的纵波测至20,000公斤/厘米~2。发现压力高于4000公斤/厘米~2以后,速度基本上随压力呈直线变化,但当压力高于10,000公斤/厘米~2时直线的斜率逐级降低。在横波速度测定中,为提高脉冲初至到时的测定精度,在发射和接收端分别加入耦合电路。利用S波波列的多点测量外推方法有效地提高了测量精度。最后对结果作了细致的误差分析。

A PRELIMINARY STUDY OF P- AND S-WAVE VELOCITIES UNDER HIGH PRESSURE OF ROCK SAMPLES FROM THE MAINLAND OF CHINA

The compressional （P） and transversal （S） wave velocities of 20 specimens of 10 different rock types and 1 specimen of silver chloride were determined under high pressure. The pressure in measuring the P-wave velocity of three of the specimens went up as high as 20,000 kg/cm2. It was found that above 4,000 kg/cm2 of pressure, the change of velocity with pressure became practically linear, but the rate of change decreased gradually when the pressure was greater than 10,000 kg/cm2.For the determination of the S-wave velocity, in order to obtain more accurate first arrival times, coupled circuits were connected respectively to both the emitting and receiving crystals. By employing a method of "extrapolation of multiple points" measurement of the S-wave train, we can reasonably raise the accuracy. Errors of the results were then analysed.