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Abstract According to the issue of unsymmetrical force in the construction of shallow-buried bias multi-arch tunnel and the actual situation of Yaoshuixia multi-arch tunnel，the mechanical characteristics of shallow-buried bias multi-arch tunnel are analyzed using finite element method and in-situ monitoring，and the support structure is optimized with unsymmetrical design methods. The results indicate that the unsymmetrical design and construction of the shallow-buried bias multi-arch tunnel are feasible；the pressure on earlier constructed cavern of the multi-arch tunnel is greater than that of the later one，and the relation between this result and the bias condition is not obvious；the pressure on surrounding rock of shallow-buried bias multi-arch tunnel should be considered according to the radial load of the round cavern. Therefore，when designing and constructing the similar shallow- buried bias multi-arch tunnel，the construction sequence should be paid attention to，and the unsymmetrical design of the structure is feasible.
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Received: 26 December 2009
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