Tests and analysis of ground motion signals of ice-rock avanlanches
摘要
With the strategic deployment of western development and the continuous rise of global temperature, the ice-rock avalanches have attracted the wide attention of scholars in the industry because of their high mobility and destructive power. The large-scale flume tests are carried out to simulate the ice-rock avalanches. The seismic signals generated by the ice-rock avalanches are obtained by using the high-precision sensors in the field, and the time-frequency characteristics of signals under 5 working conditions are compared and analyzed based on the Hilbert-Huang transform method. The correlation between ice content and ice location and the impact force of ice-rock avalanches are investigated. According to the analysis results, the larger the ice content and the larger the contact surface between the ice and the detachment surface, the larger the amplitude, the shorter the time and the more concentrated the peak value of the induced seismic signals. The frequency of signals is mainly distributed in the range of 0.06~45 Hz. The low-frequency vibration is dominant, while the high-frequency ones are concentrated in the period of strong impact and collision between the ice-rock avalanches and the gentle slope section and the river banks.