Abstract
This study presents an investigation of joint stiffness determination by the frequency characteristics of transmitted wave in rock mass. First, the frequency characteristics of transmitted waves were investigated, and a method for determining joint stiffness based on frequency characteristics was proposed. Subsequently, the method was applied in a pendulum impact test to determine the joint stiffness of different joints. The stiffnesses of non-filled, sand-filled and clay-filled joints were determined. Finally, the effects of the amplitude and frequency of the incident wave on the accuracy of the joint stiffness determination method were discussed by comparing the predicted transmitted wave amplitude and energy with the measured transmitted wave amplitude and energy. The results show that the joint stiffness determination method can predict the transmitted wave amplitude and energy through a non-filled joint with more accuracy than a filled joint. In addition, for sand or clay-filled joints, the present method could satisfactorily predict the transmitted wave amplitude at a lower incident amplitude and a higher incident frequency. In contrast, when predicting the transmitted wave energy, a lower incident amplitude and frequency were more suitable.
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