Stress Relief and Stimulation of Coal Reservoir by Hydraulic Slotting

Table 2

Stress relief area around slotting.

Slotting width (mm)	Stress relief area of vertical stress		Stress relief area of horizontal stress
	Slotting up-down side (cm)	Slotting end (cm)	Slotting up-down side (cm)	Slotting end (cm)
40	2.2	0.4	0.4	0.4
60	3.2	0.6	0.6	0.6
80	3.5	0.8	0.9	0.8
100	3.8	1.0	1.2	1.0