Study on the Stability of Surrounding Rock of Underground Circular Cavern Based on the Anchor Reinforcement Effect

Table 1

for different rocks [31].

Rock type	(GPa)
Hard rock	5.00∼10.00
Soft rock	1.50∼3.00
Weathered rock	1.00∼2.00
Mudstone	1.20∼2.50
Diluvium sand	0.40∼0.70
Gravel	0.40∼0.70
Diluvium clay	0.40∼1.00
Shock layer sand	0.05∼0.20