A Study on the Mechanisms of Tension-Shear Failure and the Estimation Model for Key Parameters of Free-Face-Assisted Rock Breaking

Table 1

The test values and model values under different penetration depths.

(mm)	10	30	50	70	90
Test value , H = 3 mm	18.5°	25.3°	—	—	—
Test value , H = 6 mm	14.1°	25.5°	25.5°	27.1°	—
Test value , H = 9 mm	12.8°	17.2°	19.5°	24.2°	28.8°
Model value			36.65°