Fig. 1
WCR roof fall occurred in Dananhu No.7 Coal Mine, (a) roadway roof caving due to alkaline water effect, (b) caved weakly cemented sandstone, (c) eroded sandstone.
Fig. 1 | Scientific Reports
WCR roof fall occurred in Dananhu No.7 Coal Mine, (a) roadway roof caving due to alkaline water effect, (b) caved weakly cemented sandstone, (c) eroded sandstone.
