Table 2 Rock and soil parameters of the tunnel exit slope.

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

Rock‒soil mass

Gravity γ kN/m3

Force of cohesion c/Pa

Angle of internal friction φ/°

Silty clay

19.5

23,500

12

Strongly weathered sandstone

21

45,000

25

Back to article page