基于微震信号多重分形特征的岩石边坡变形预警研究

doi:10.13722/j.cnki.jrme.2019.1021

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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.

Key words： slope engineering;microseismic monitoring;deformation pre-warning;multi-fractal

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	Articles by authors
	MAO Haoyu1
	ZHANG Min1
	JIANG Ruochen1
	LI Biao2
	XU Jian3
	XU Nuwen1

Cite this article:

MAO Haoyu1,ZHANG Min1,JIANG Ruochen1, et al. Study on deformation pre-warning of rock slopes based on multi-fractal characteristics of microseismic signals[J]. , 2020, 39(3): 560-571.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1021 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I3/560

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