Table 1: Sample information of the acoustic emission test.

AzimuthSample numberSample sizeAxial velocity value (m·s−1)
Height (mm)Diameter (mm)

Horizontal direction 225°225°-1102.5654.004102
225°-2102.6055.284104
225°-3102.4055.004096
225°-4101.1055.044044

Horizontal direction 270°270°-1101.7053.443767
270°-2103.0053.743433
270°-3101.4853.503383
270°-4102.0653.403645

Horizontal direction 315°315°-1102.7654.023806
315°-2102.4053.743657
315°-3102.0254.004251
315°-4103.3054.023973

Vertical direction 90°90°-199.9649.043832
90°-2100.0248.983804
90°-3100.0049.004167
90°-4100.5049.004188