Roof Control Technology of Mining Roadway under the Influence of Advanced Supporting Pressure

Table 1

The lithology of the roof and floor.

Roof and floor name	Rock name	Thickness (m)	Lithology
Basic top	Sandy shale argillaceous shale	6.5	Dense and hard, not easy to fall
Direct top	Partially sandy shale	1.6	Broken, cracks developed, easy to straddle
Pseudotop	Mudstone	0.2	Fall with the mining
Direct bottom	Sandy shale	2.4	Siltstone lenticular horizontal bedding with fissures
Old bottom	Fine-grained sandstone	2.42	Horizontal bedding fissures are developed and hard, f = 6 or so