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将S变换时频分析技术引入微震信号波形分析领域,通过震源破裂尺度,研究微震信号频率特征与岩体变形破坏之间的联系。以西南地区3个水电工程作为研究对象,将大量微震监测数据作为统计样本以减小外部因素对参数计算的影响。在该基础上统计、分析岩体破裂尺度与微震信号频率之间的关系,结合大渡河猴子岩水电站地下厂房微震与多点位移计监测资料进行工程实证研究。研究结果表明,当岩体破裂尺度增大时微震信号高频成分减少,表现出低频特征;在围岩变形过程中微震信号高频成分呈现出先减少再增加的演化规律,围岩发生明显变形前微震信号出现由高频向低频转移的现象,因此,可将聚集区域内微震信号频率降低作为该区域岩体宏观变形破坏的前兆信息。研究结果可为基于微震监测的岩体工程稳定性分析及其灾害预测预报提供参考。
The S-transform time-frequency analysis technology is introduced into the field of microseismic signal waveform analysis. Based on the source rupture scale, the relationship between the frequency characteristics of microseismic signals and the deformation and failure of rock mass is studied. Taking the three hydropower projects in southwest China as the research object, a large number of microseismic monitoring data are taken as statistical samples to reduce the influence of external factors on the parameter calculation. On this basis, the relationship between the rupture scale of rock mass and the frequency of microseismic signals is statistically analyzed and analyzed. Combined with the monitoring data of the microseismic and multi-point displacement meters in the underground powerhouse of the Dadu River at the Houzhipan Hydropower Station, an engineering empirical study is carried out. The results show that when the rupture scale of rock mass increases, the high-frequency component of microseismic signal decreases and exhibits low frequency. During the deformation of surrounding rock, the high-frequency component of microseismic signal shows the first to decrease and then increase. Before the obvious deformation of surrounding rock The phenomenon of microseismic signal shifting from high frequency to low frequency can reduce the frequency of microseismic signal in the gathering area as a precursor to the macroscopic deformation and failure of rock mass in this area. The results can provide a reference for stability analysis of rock mass based on microseismic monitoring and prediction of disaster.