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- W2080382252 abstract "To investigate possible indicators of critical point behavior prior to rock failure, the statistical properties of pre-failure damage were analyzed based on acoustic emission events (AE) recorded during the catastrophic fracture of typical rock samples under differential compression. AEs were monitored using a high-speed 32-channel waveform recording system. Time-dependent statistics, including the energy release rate, b-value of the magnitude–frequency distribution, fractal dimension and spatial correlation length (SCL) of the AE hypocenters were calculated for each data set. Each parameter is a function of the time-to-failure and thus can be treated as an indicator of the critical point. It is clear that the pre-failure damage evolution prior to catastrophic failures in several common rock-types is generally characterized by: 1) accelerated energy release, 2) a decrease in fractal dimension and SCL with a subsequent precursory increase, and 3) a decrease in b-value from ∼ 1.5 to ∼ 0.5 for hard rocks, and from ∼ 1.1 to ∼ 0.8 for soft rocks such S–C cataclasite. However, each parameter also reveals more complicated temporal evolution due to either the heterogeneity of the rock mass or the micro-mechanics of shear fracturing. This confirms the potential importance of integrated analysis of two or more parameters for successfully predicting the critical point. The decreasing b-value and increasing energy release may prove meaningful for intermediate-term prediction, while the precursory increase in fractal dimension and SCL may facilitate short-term prediction." @default.
- W2080382252 created "2016-06-24" @default.
- W2080382252 creator A5040190021 @default.
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- W2080382252 date "2007-02-01" @default.
- W2080382252 modified "2023-09-23" @default.
- W2080382252 title "Indicators of critical point behavior prior to rock failure inferred from pre-failure damage" @default.
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- W2080382252 doi "https://doi.org/10.1016/j.tecto.2006.04.023" @default.
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