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  Behavior of Parallel Shield Tunnels Lining with a Large Cross-Section and High-Proximity

  In the Kansai region in Japan, parallel bored tunnels with large cross-section have been constructed in very close proximity to each other for a long distance by earth pressure balance type of shield tunneling. The lining design of the first tunnel is considered an impact of a following parallel tunnel construction in close proximity. An alignment of bored tunnels has straight sections with different overburdens, curved sections. To know the behavior of these tunnels, many kinds of monitoring were carried out at typical cross-sections that have different tunneling conditions. As a result of comparison, it revealed that the observed behavior could be correspondent to the prediction based on design in terms of an axial force, bending moment and convergence of tunnels regardless of differences in tunnel depth, alignment, soil condition and so on.

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