Mechanism and Application of Static Fracturing Technology on Deep Working Face

Table 10

Range for volume of plastic zone ΔU of each model.

	Hole diameter A	Hole spacing B	Hole depth C
k1	1.023	13.10	0.877
k2	4.055	1.797	4.747
k3	7.685	1.375	9.177
k4		0.99	2.227
k5		0.81
Range	6.6625	12.293	8.3