Investigation on Surrounding Rock Stability Control Technology of High Stress Roadway in Steeply Dipping Coal Seam

Table 2

The distance between roof and upper coal seam of 12032 haulage roadway.

Distance to open-off cut L (m)	0–55	55–200	200–235	235–310	310–465	465–620	620–710
Roadway length l (m)	55.0	145.0	35.0	75.0	155.0	55.0	90.0
Roof thickness H (m)	1.50–1.75	0.85–1.50	1.50–2.00	2.00–2.50	2.50–3.00	3.00–3.50	3.50–3.90
Roof classification type	II	I	II	II	III	III	IV