Table 2 Mechanical property parameters of materials.

From: Optimization of the single-side drift method for shallow-buried tunnels under large eccentric pressure based on the BiDoseResp settlement model

Material

Unit weight (kN/m3)

Elastic modulus(MPa)

Poisson’s ratio

Cohesion (kPa)

Friction angle (°)

Silty soil

22

13

0.3

11

36

Strongly weathered slate

21.5

22

0.16

31

29

Shotcrete

25

29

0.3

–

–

Steel

78.5

200

0.3

–

–

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