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Advances in Civil Engineering
/
2019
/
Article
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Fig 7
/
Research Article
Rotational Failure Mechanism for Face Stability of Circular Shield Tunnels in Frictional Soils
Figure 7
View of the critical failure surfaces of tunnel face in purely frictional soil with
c
= 0 kPa and
φ
= 40°.
(a)
(b)