Table 2 Calculation results.

From: Numerical analyses for three-dimensional face stability of circular tunnels in purely cohesive soils with linearly increasing strength

Coefficient

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Blow-out

UB

LB

UB

LB

Nc0

6.257

5.999

6.293

6.021

Ncρ

3.201

3.096

3.125

3.044

Nγ

1.030

1.033

0.780

0.773

σt (kPa)

406.37

416.71

836.22

825.98

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