Surrounding Rock Stability Classification Method of Coal Roadway Based on In Situ Stress

Table 1

The factors affecting surrounding rock stability of coal roadway.

No.	Type	Factor
1	Strength	Strength of main roof
2		Strength of immediate roof
3		Strength of coal seam
4		Strength of immediate floor
5	Coal mining method
6	In situ stress	Magnitude
7		Angle
8	Width of coal pillar in roadway
9	Roadway characteristics	Height
10		Width
11		Buried depth
12	Coal seam geological characteristics	Thickness
13		Dip angle
14		Buried depth
15	Thickness of roof and floor	Main roof
16		Immediate roof
17		Immediate floor
18	Abutment pressure characteristics	Immediate roof first caving interval
19		Main roof first weighting interval
20		Main roof periodic weighting interval
21	Groundwater
22	Time