Defining Stress Thresholds of Granite Failure Process Based on Acoustic Emission Activity Parameters

Table 2

Average values of percentages of various stress thresholds versus peak strength for rock samples.

Specimens	Percentage of crack closure versus peak strength (%)	Percentages of crack initiation versus peak strength (%)	Percentages of crack interaction versus peak strength (%)	Percentages of crack damage versus peak strength (%)
This study	12.82	54.41	74.50	90.76
Tradition [3]	—	≈35	------	≈80
130 m level Pink Granite [6]	16.88	46.22		75.23
240 m level Pink Granite [29]	18.91	40.63		76.37
Gabbro [30]	15.39	31.85		73.87
Yeosan Marble [31]	19.66	34.45		92.32