Group

Depth of tunnel

H/m

Rock mass weight

γ/(kN/m3)

Internal friction angle

φ/˚

Tunnel span

B/m

1

50

18

25

10

2

50

20

30

13

3

50

23

35

16

4

50

26

40

20

5

60

18

30

16

6

60

20

25

20

7

60

23

40

10

8

60

26

35

13

9

70

18

35

20

10

70

20

40

16

11

70

23

25

13

12

70

26

30

10

13

80

18

40

13

14

80

20

35

10

15

80

23

30

20

16

80

26

25

16