Study on deformation pre-warning of rock slopes based on multi-fractal characteristics of microseismic signals
MAO Haoyu1，ZHANG Min1，JIANG Ruochen1，LI Biao2，XU Jian3，XU Nuwen1
(1. State Key Laboratory of Hydraulics and Mountain River Engineering，Sichuan University，Chengdu，Sichuan 610065，China；2. School of Geosciences and Technology，Southwest Petroleum University，Chengdu，Sichuan 610500，China； 3. China Three Gorges Corporation，Beijing 100038，China)
Abstract：Based on the rock slope engineering of the left bank of Baihetan hydropower station，Multi-fractal Detrended Fluctuation Analysis (MF-DFA) is used to estimate the multi-fractal spectrum of microseismic waveforms，and the pre-warning signs of rock slope deformation are pointed out on the basis of the time-varying response characteristics of multi-fractal time series of microseismic waveforms. The results show that the multi-fractal characteristics of rock microcracking and blasting waveform time series in the left bank slope are obvious，and that the multi-fractal spectrum width of the blasting waveform is much larger than that of the rock microcracking waveform. Before the slope cracks increase，the multi-fractal time-varying response characteristics of rock microcracking waveforms show strong regularity，which can be viewed as pre-warning signals for deformation. Before the deformation and failure of the rock mass，the multi-fractal spectrum width △α shows an increasing trend while the multi-fractal spectrum of microseismic waveforms △f(α) presents a decreasing trend，which can be regarded as precursor signals of deformation pre-warning. When deformation and failure occur，△α shows a decreasing trend while △f(α) presents an increasing trend，which can be regarded as a deformation failure period. After deformation and failure，both △α and △f(α) show a steady trend and △f(α) as a whole will be near the zero line，which can be regarded as a stable period.
毛浩宇1，张 敏1，蒋若辰1，李 彪2，徐 剑3，徐奴文1. 基于微震信号多重分形特征的岩石边坡变形预警研究[J]. 岩石力学与工程学报, 2020, 39(3): 560-571.
MAO Haoyu1，ZHANG Min1，JIANG Ruochen1，LI Biao2，XU Jian3，XU Nuwen1. Study on deformation pre-warning of rock slopes based on multi-fractal characteristics of microseismic signals. , 2020, 39(3): 560-571.
2020, Vol. 39 
