岩石中声波衰减的复合Q模型

依据建立的岩石复合Q模型,探讨了品质因数Q值与频率、饱水度及压力的关系。合理解释了一些实验现象,得出:干燥岩石 Q值与频率无关;含水岩石 Q值与频率有关。若施加频率远小于谐振频率,Q 值与频率弱相关。S 波衰减峰值发生在饱水度为100％时,而 P波衰减峰值发生在饱水度为 60％—90％范围内。

A Composite Q Model for Acoustic Wave Attenuation in Rock

The relationship between the quality factor Q value and frequency and that between the moisture-laden degree and pressure are discussed based on a composite Q model for rock developed by the authors.With some explanations made reasonably to the phenomena occured in experiments, a conclusion is thus reached that Q value is independent of frequency for dry rocks but dependent on frequency for moist rocks.Furthermore, the Q value will weakly relate to frequency if the frequency applied to rock is by far smaller than resonance frequency.