摘要
本文指出了脉冲传播和谱振幅比法测定岩石破裂孕育过程中Q值变化矛盾的原因,提出用能量法测定Q值,并以大理岩,大姚铜矿砂岩为例给出了真三轴压缩时岩石破裂孕育过程中P波总能量的变化及不同方法所测Q值的变化特征。其中能量法所测Q值与P波总能量变化特征一致,即主断裂前它们都出现了“下降—回升”变化及变化的各向异性。
In this paper, reasons of contradictory Q value variations in the process of rock fracture preparation determined by both the pulse propagation method and spectrum-amplitude ratio method have been pointed out, and the method that uses energy to determine the Q value has been presented. With the granite and sandstone specimens the total P wave energy variation in the process of rock fracture preparation under real triaxial compressions and the characteristic Q value variations by different methods are presented. The Q value by energy method is coincided with the total P wave energy variation, i. e. before the main fracture there all existed a 'downfall-rise' variation and variation anisotropy.
出处
《地震研究》
CSCD
北大核心
1992年第4期418-425,共8页
Journal of Seismological Research
关键词
差应力
岩石
Q值
测定
地震
地质
Q value determination
Spectrum-amplitude ratio method
Energy Method
Total P wave energy
