Analysis of Face Stability during Excavation of Double-O-Tube Shield Tunnel

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="781968.fig.007a" src="https://static-preview.hindawi.com/articles/tswj/volume-2013/781968/figures/781968.fig.007a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Sand strata</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="781968.fig.007b" src="https://static-preview.hindawi.com/articles/tswj/volume-2013/781968/figures/781968.fig.007b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>Silt strata</td></tr></table></td></tr></table>

<table>Cross-sectional failure form of the tunnel face.</table>

The Scientific World Journal

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Figure 7

Figure 7: Analysis of Face Stability during Excavation of Double-O-Tube Shield Tunnel 