Table 1 Physical and mechanical parameters of geotechnical properties.

From: Influence of portal excavation of shallow-buried bias tunnel on stability of soil‒rock bedding slope: a case study of Moziping tunnel

Stratum Lithologic

Modulus of deformation (MPa)

Density (g/cm3)

Characteristic value of foundation bearing capacity fa0 (kPa)

Cohesion c (kPa)

Angle of internal friction φ (°)

Silty clay

4.4

1.95

140

23.5

12

Sandy mudstone

22

2.06

280

35

22

Strongly weathered sandstone

25

2.1

300

45

25

Medium weathered sandstone

3551

2.45

1500

1500

35

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