Seismic wave effects on shallow buried tunnels with thin linings

A new approach is proposed for studying the effect of seismic waves on a shallow buried tunnel. To assess the stress state of underground structures, the stresses generating the seismic impact are reduced to the solution of a quasi-static problem loaded at infinity. The performed calculations showed that at actual seismic wavelengths, the change in stress amplitudes with depth occurs much more slowly. In the most unfavorable case, the seismic impact on a thin-layered tunnel decreases as compressive horizontal stresses develop in the rock mass. The research proposes a slightly different approach to calculating the seismic effects of earthquakes on thin-lined tunnels. The study determined a specific solution to the dynamic problem of a plane harmonic wave at the boundary of a half-plane, which is softened by a cavity reinforced with a multilayer ring. The stresses applied to this softened half-plane were analyzed.

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