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Advances in Civil Engineering
/
2020
/
Article
/
Tab 3
/
Research Article
A Theoretical Calculation Method of the Unsupported Span for the Shallow Tunnel in the Soft Stratum
Table 3
Calculation parameters.
Weight
(kN/m
3
)
Cohesion
c
(kPa)
Fractional angel
(°)
Lateral pressure coefficient
20
50
22
0.45