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

Table 2

Support load (MPa) in areas affected by roof cutting in the roof-unloading and retaining roadway.

Hydraulic support	Conventional coal mining area			Influence area of cutting roof is reserved for cutting-roof pressure relief
	Maximum	Minimum	Average	Maximum	Minimum	Average
No. 5	55.5	33	37.5	44	32	35
No. 10	56	31	37.5	44	30	38
No. 20	56	35	42.5	44	32	37.5