Research Article

An Evaluation Method of Rock Brittleness Based on the Prepeak Crack Initiation and Postpeak Stress Drop Characteristics

Table 5

Calculation results of each index for marble under different confining pressures.

Confining pressure (MPa)BIBi·BiiComparison of brittleness indicesQualitative analysis of the test curve
B1B2B3B4B5

50.1520.760.261.130.360.66Brittleness
150.1100.390.210.830.470.65Elasticity-plasticity
250.0820.200.100.310.520.88Elasticity-plasticity
350.0780.190.130.450.480.63Elasticity-plasticity