Stability Control of a Roadway Surrounding Rock during the Cutting and Pressure Relief of a Coal-Bearing Roof at a Shallow Mining Depth

Table 3

Support load and periodic pressure step in the middle of the unaffected area and uncut top area.

Area	Hydraulic support	Hydraulic support load (MPa)			Periodic pressure step (m)
		Maximum	Minimum	Average
Middle unaffected area	No. 95	60	32.5	44.2	10–20
	No. 100	60	34	45	10–20
Uncut top area	No. 125	55	32	38.5	8–12
	No. 165	54	31.5	37.5	8–12