Indirect method for the quantitative identification of unstable rock

Under the influence of continuous external factors (rainfall, earthquakes, construction, etc.), slope rock masses in a stable state can gradually transition to unstable rock, which then collapse. A safety factor identify occurrence failure but cannot rock; thus, it realise quantitative identification latter. In this study, cohesive (CSF) and relatively objective analysis method are proposed effectively rock. The CSF be calculated by natural vibration frequency applied as mechanical index characterise when is less than 1, defined unstable. Compared with traditional method, new has merits simple operation, low cost high efficiency provides complete evaluation criteria for engineers engaged early warning prevention