| 三轴应力下花岗岩声发射P波Q值的变化 |
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| 引用本文： | 缪君,许昭永.三轴应力下花岗岩声发射P波Q值的变化[J].地震地质,1990,12(4):311-315. |
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| 作者姓名： | 缪君 许昭永 |
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| 作者单位： | 云南省地震局
(缪君，许昭永)，云南省地震局(韩明) |
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| 摘 要： | 50×50×100mm3盈江花岗岩样品在σ3=30MPa、σ2=60MPa时增加σ1直至破裂,用波传播和谱振幅比法测定破裂孕育过程中σ3方向和σ2方向声发射P波Q值。结果表明:1.在σ1<0.07σ1P(最大破裂压强)时,σ3、σ2方向都保持高值,在0.2σ1P≤σ1≤0.551P期间,两个方向的Q值呈现出比较平稳的状态,其平均值Q3大约10至20,σ2方向Q2大约20至30。在σ1>0.55σ1P后,σ3方向Q3值起伏增长较大,而σ2方向Q2值仅在σ1>0.7σ1P后,才起伏增长,幅度不如σ3方向大。2.随压力的增加,在σ3、σ2两方向,低频成分明显加大。3.当σ1>0.951P后,出现一种记录畸变现象,对同一源点声发射,从沿同一方向两道记录上看出,早到波形振幅小,而晚到波形其振幅反而大
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| 关 键 词： | P波Q值 声发射 谱振幅 主破裂面 |
P-WAVE Q-VALUE OF ACOUSTIC EMISSION IN FRACTURE PROCESS OF GRANITE SPECIMENS UNDER TRUE TRIAXIAL COMPRESSION |
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| Miao Jun,Xu Zhao-yong and Han Ming.P-WAVE Q-VALUE OF ACOUSTIC EMISSION IN FRACTURE PROCESS OF GRANITE SPECIMENS UNDER TRUE TRIAXIAL COMPRESSION[J].Seismology and Geology,1990,12(4):311-315. |
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| Authors: | Miao Jun Xu Zhao-yong and Han Ming |
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| Abstract: | Yinjiang granite specimens 50×50× 100mm3 in size are tested under true triaxial compressions of σ3 = 30 MPa, σ2 = 60MPa and increasing σ1 until the specimens fracture. We determined the P-wave Q-value of acoustic emission in σ3 and σ2 directions in the fracture process of specimens from the wave propagation and the spectral amplitude ratio. The obtained result shows that P-wave Q-vaiue and spectral amplitude of acoustic emission show their significant characteristic variation, which are anisotropic. We found an abnormal phenomenon: after σ1>0.95σIP, for the amplitudes of waves emitted from same source, those which are received by near probe are smaller, and those which are received by far probe are large |
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| Keywords: | P-wave Q-value Acoustic emission Spectral amplitude Fracture plane |
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