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为了了解蛇纹石在脱水过程中的弹性性质 ,在 1 0GPa和同时加热条件下 ,利用脉冲透射法对采自云南双沟街的蛇纹岩进行了超声测量 .实验发现 ,当温度升高至 640℃时 ,蛇纹岩的超声波纵波速度随温度的升高而急剧下降 .温度继续升高 (70 0℃以上 ) ,样品在高压腔中爆炸 .通过对超声波速下降时和样品发生爆炸前的超声波波形的比较发现 ,随温度升高超声波振幅有了明显的增大 .实验产物的鉴定并与前人相关实验结果比较表明 ,蛇纹岩在高压高温下波速的突然下降和振幅增大与样品中蛇纹石发生脱水反应有关 .目前还不能准确解释超声波振幅增大的原因 ,但上述现象的发现为探讨深部地质灾害的成因并对其进行监测提供了一个新的线索 .
In order to understand the elastic properties of serpentine in the process of dehydration, ultrasonic measurements were performed on the serpentinite collected from Shuanggou St., Yunnan Province, using pulse transmission at 10 GPa and simultaneous heating. It was found that when the temperature was raised to At 640 ℃, the P-wave velocity decreases sharply with the increase of temperature, and the temperature continues to rise (above 70 ℃) and the sample explodes in the high-pressure chamber.After the ultrasonic velocity declines and before the sample explodes The comparison of the ultrasonic waveforms shows that the amplitude of the ultrasonic wave increases obviously with the increase of the temperature.The identification of the experimental products and the comparison with the previous experimental results show that the sudden decrease and amplitude increase of the velocities of the serpentinite under high pressure and high temperature are similar to those of the samples However, the discovery of the above phenomena provides a new clue for exploring the causes of deep geological disasters and monitoring them.