Table. 3 Material physical and mechanical parameters.

From: Mechanical response characteristics of large-span double-arch tunnel construction and eccentric loading effect on the partition wall

Types

Concrete grade

Gravity γ (kN/m3)

Modulus of elasticity E (GPa)

Cohesion c(kPa)

friction angle φ (°)

Poisson μ

Red clay

-

18

0.9

54

11

0.26

Moderately weathered dolomite

-

26.2

1.1

150

24

0.3

Surround rock reinforcement zone

-

28.5

3.0

300

45

0.3

Middle wall

C30

23.5

30

-

-

0.3

Initial support

C25

23.5

28

-

-

0.2

Temporary steel support

-

79

210

-

-

0.3

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