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本文研究了江西钨矿床中具有代表性的部分围岩,即变质石英砂岩、闪长岩和石英脉石在单轴压缩条件下变形、破坏全过程中的声学性质。结果表明:波速的变化主要受裂隙所控制,这种传播特征即为声波的“裂隙效应”。反映裂隙扩展或新生过程的“张裂型”裂隙效应比反映裂隙闭合、压密过程的“压缩型”裂隙效应一般较为强烈。垂直施压轴方向监测声速的变化往往比平行施压轴方向,能更加准确地反映岩石试件断裂的发生与发展。
In this paper, some typical wall rocks in Jiangxi tungsten deposit are studied, namely, the acoustic properties of metamorphic quartz sandstone, diorite and quartz gangue in the whole process of deformation and failure under uniaxial compression. The results show that the change of wave velocity is mainly controlled by the fracture, which is the “fissure effect” of the acoustic wave. The “fissure” fissure effect that reflects the process of fissure expansion or infiltration is generally stronger than the “compression” fissure effect that reflects the process of fissure closure and compaction. The variation of the monitored sound velocity in the direction of the vertical compression axis tends to be more than the direction of the parallel compression axis, which can more accurately reflect the occurrence and development of the fracture of the rock specimen.