Presplitting Blasting the Roof Strata to Control Large Deformation in the Deep Mine Roadway

Table 2

The influence range and value of lead abutment pressure.

Position	Range		Peak stress		Average stress (MPa)
	Affected area (m)	Violent zone (m)	Ahead of the face (m)	Value (MPa)
Haulage roadway	80	30	7	27.2	16.7
Ventilation roadway	50	20	5	22.7	15.3