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为了研究应力波在穿越层状节理岩体发生透射和反射作用后能量的衰减规律,基于Froude相似比例法制作了层状节理岩体模型,并对模型进行瞬时冲击实验研究。通过对不同位置的加速度时程信号的分析,得出应力波因在节理结构面之间的透反射波的叠加作用形成增强信号,使得穿过节理后的时程信号峰值均未在刚起跳时达到最大,而是起跳后的一段时间先后出现峰值。通过离散快速傅里叶变换对时域信号进行频谱特性分析,得出规律:节理对应力波的阻隔作用使节理前后信号的主频和频率内最大振幅均呈非线性降低趋势,信号的高频部分迅速衰减、能量逐渐被吸收。
In order to study the attenuation law of stress after the transmission and reflection of stress wave through the layered jointed rock mass, a layered rock mass model was made based on the Froude similarity scale method, and the instantaneous impact experiment was conducted on the model. Through the analysis of acceleration time-history signals at different positions, it can be concluded that the stress wave forms an enhanced signal due to the superposition of the transflective waves between the joint planes, so that the peaks of the time-series signals after passing through the joints are not exactly Reached the maximum, but after a period of time has peaked. The discrete Fourier transform (FFT) is used to analyze the spectral characteristics of the time-domain signal, and the law is obtained that the blocking effect of the joint on the stress wave makes the dominant frequency and the maximum amplitude within the frequency decrease non-linearly. The high frequency Part of the rapid decline in energy gradually absorbed.