Table 1 Mineral composition of rocks.

From: A study on surrounding rock characteristics inducing severe large deformation in tunnels and methods for determining its strength

Group

Actinolite

Albite

Chlorite

Epidote

Hornblende

Calcite

Metal minerals

Others

A

40 ~ 50%

25 ~ 30%

10 ~ 15%

5 ~ 6%

3 ~ 5%

1 ~ 2%

2 ~ 3%

1 ~ 2%

B

65 ~ 70%

–

15 ~ 20%

8 ~ 10%

3%

–

2%

1%

C

60 ~ 65%

–

25 ~ 30%

3 ~ 5%

–

–

5%

1%

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