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把岩石抽象为Kelvin粘弹性体,运用波动方程和复数理论建立应力波振幅随时间的衰减模型,提出基于测点特征波形振幅随时间衰减系数的岩石粘性系数现场测试方法.在岩石表面施加冲击载荷,布置传感器记录测点振动波形,分析应力波传播过程中频谱变化规律,由振动波形的第一特征频率确定有效带宽,通过带通滤波得到相应的特征波形,由测点特征波形振幅随时间的衰减系数计算岩石的粘性系数,并验证了计算结果的可靠性,为确定岩石力学参数提出了新方法.
The rock is abstracted as Kelvin viscoelastic body, and the attenuation model of stress wave amplitude with time is established by using wave equation and complex theory. A field test method of rock viscosity coefficient based on attenuation coefficient of characteristic waveform amplitude with time is proposed. , The sensor is arranged to record the vibration waveform of the measuring point and the spectrum variation during stress wave propagation is analyzed. The effective bandwidth is determined from the first characteristic frequency of the vibration waveform. The corresponding characteristic waveform is obtained through band-pass filtering. The amplitude of the characteristic waveform of measuring point changes with time The attenuation coefficient calculates the viscous coefficient of rock, and verifies the reliability of the calculated result. A new method is proposed to determine the rock mechanics parameters.