Tests for fracture characteristics of fractured sandstone and micro-seismic and charge induced signal laws

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (23) : 211-219.

ZHAO Yangfeng, JING Gang, CHENG Chuanjie, LI Bing

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Abstract

In order to effectively extract precursory information of instability failure of fractured sandstone, failure characteristics of intact sandstone and fissured one with different dips under uniaxial compression, and laws of charge induction signals and micro-seismic ones were tested and studied.Results showed that the existence of fractures is the main factor affecting uniaxial compressive strength and failure characteristics of sandstone; with decrease in fracture dip, the uniaxial compressive strength of sandstone decreases, and the fracture mode changes from tension-shear composite fracture to shear-lip one; micro-seismic and charge signals of intact specimens have high amplitude fluctuation only near peak stress, but they are lower in initial loading compaction stage and elastic one; if the occurrence time of micro-seismic and high-amplitude charge signals in fractured rock samples is in advance, the number of high-amplitude pulses increases; high-amplitude pulses only appear near peak stress in intact samples, if rock specimens have fractures, many high-amplitude pulses appear in rock elastic later stage; when fracture dip angle changes from 60° to 45° and then to 30°, micro-seismic and charge signals change from intensive ones to multiple isolated ones, micro-seismic signal and charge one are not completely synchronized, and better “synergistic” signals appear only in rock post-peak stage; stress drop of rocks is a sufficient and unnecessary condition to generate micro-seismic and charge-induced signals; combining micro-seismic and charge induction monitoring technique with stress field distribution of rock mass monitoring area to guide field practice is helpful to improve the prediction accuracy and reduce the occurrence of geological disasters.

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fractured sandstone / failure characteristics / charge induction / micro-seismic

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ZHAO Yangfeng, JING Gang, CHENG Chuanjie, LI Bing. Tests for fracture characteristics of fractured sandstone and micro-seismic and charge induced signal laws[J]. Journal of Vibration and Shock, 2020, 39(23): 211-219

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