Table 1 Mechanical properties of the rock masses.

From: Stability evaluation of tunnels in steeply dipping layered rock mass using numerical models: a case study

Lithology

Density

(kg/m3)

Young’s Modulus

(GPa)

Uniaxial compressive strength

(MPa)

RMR

GSI

Poisson’s ratio

Friction angle

(°)

Cohesion

(MPa)

Tensile strength

(MPa)

Basalt

2700

3.62

55

45

40

0.25

45.1

1.45

0.063

Volcanic Ash

2700

2.13

49

38

33

0.25

41.6

1.25

0.052

Fault zone

2300

0.14

40

39

34

0.25

40

0.06

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