真三轴压机刚度对岩石破裂声发射的影响及与地震活动性的联系.

THE INFLUNCE OF STIFFNESS OF THE TRUE TRIAXIAL TESTING MACHINE ON THE RUPTURING AND ACOUSTIC EMISSION OF ROCKS AND ITS CORRELATION WITH SEISMIC ACTIVITIES

  • 摘要: 本文叙述了岩石特征刚度与压机刚度比R对岩石破裂及声发射的影响.结果表明:当R>0.20时,岩样产生突发断裂;当R1.50时,断裂前没有平静期.缓裂时,声发射率的变化形式为(应力增至大于50%破裂应力后)平稳低(高)值——上升(下降)至极大(极小)值并持续之——破裂.

     

    Abstract: This paper introduces how the ratio R of the characteristic stiffness of rock sample vs. the. stiffness of testing machine would influence the rupturing process and the acoustic emission (AE) on the part of the tested rock samples. Result of the experiment shows: When R> 0.20, the rock sample would rupture abruptly, whereas when R1.50, no pre-failure quiescence is detected. When the rock samples rupture slowly, the variation pattern of the AE rate (after the stress has increased to more than 50% of the rupturing stress) is as the following: Stable low (or high) values-rising (or dropping) to its maximum (or minimum) values and then continuing for some time-rupturing.

     

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