Pressure Arch Effect of Deeply Buried Symmetrically Distributed Triple Tunnels

Compared with single or twin tunnels, the pressure arch effect of deeply buried, symmetrically distributed triple tunnels are more complex and less studied. In this paper, arching responses in-situ measured in Badaling Great Wall station. Numerical research is subsequently conducted to investigate formation development tunnels. Then, influencing law buried depth on behavior systematically Based monitoring data, rock distribution asymmetric about axis response middle significant than that left right According numerical analysis, a combined large may be easily formed across The pre-arching double-arching effects also numerically observed during tunnel excavations. inner boundary 14.0 m, nearly two times higher those This simulation result indicates mechanical state least desirable. Moreover, critical closely spaced 1.75 tunnel. tunnel, support should additionally strengthened.