Research of the Surrounding Rock Deformation Control Technology in Roadway under Multiple Excavations and Mining

Table 1

Rock property characteristics of coal seam roof and floor.

Name of the roof and floor	Rock name	Thickness (m)	Features
Main roof	Medium sandstone	2.5–6.15	Grayish white, calcareous cemented and mainly composed of quartz feldspar
Direct roof	Sandy mudstone	1.5–4.32	Gray black, uniform bedding, massive structure
Direct bottom	Sandy mudstone	2.5–6.3	Gray black, flat fracture
Main floor	Medium sandstone	2.0–12	Gray white, calcareous cementation, general sorting