Table. 2 Mechanical parameters of surrounding rock materials.

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

Surrounding rock

Modulus of elasticity E (MPa)

Friction angle φ (°)

Cohesion c (kPa)

Poisson’s ratio μ

Prototype V

 < 1300

20 ~ 27

50 ~ 200

0.35 ~ 0.45

Model V

22.34

25.28

3.06

0.42

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