泥石流地声参数传播特征值的测试与分析

TEST AND ANALYSIS FOR DEBRIS FLOW GROUND SOUND INTERFEX VALUE

应用新的地声参数测试仪，在现场采集了多阵泥石流地声信号，并对数据进行了初步分析处理，提出泥石流地声参数值的大小与检测距离有关，地声波的衰减系数与埋设传感器地点的岩体质地有关。利用泥石流地声随距离变化的衰减系数。

Some results in debris flow warning have been got, which concern ground sound parameters and debris flow discharge. Some warning devices about debris flow were built in previous years, but they are only preliminary steps, and there are still problems unsolved. For the sake of research on the spread characteristics of debris flow, a new set_up with four sensors was invented. These sensors were placed in different distances from the channel-blank that debris flow impacted. More than twenty ground sound datas were recorded and analiyzed. The relationships between FFT figure, wave figure and the distances from the back have shown that the more the distant, the less the values of FFT and wave. Thus we can easily calculate the decline coefficients of the ground sounds with the distances by comparisons of the different FFT and wave figures. Using this method, we have established the threshold for debris flow warning in Jiangjia Ravine. The research results also show that the declining coefficients are associated with the types of deposits and rocks where the sensors were put. The ground sound declines faster in debris flow sediments than in slate. This implies that the different ground sound also resulted in different stratum. Analysis of these findings may provide more accurate values for debris flow warning system.