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Abstract Based on conventional longitudinal equivalent continuous model，a generalized longitudinal equivalent continuous model is proposed，in which transverse rigidity of the tunnel and the influential region of the longitudinal joints are considered. Yaohua local road tunnel for magnetic suspension train is selected as an example to investigate the variation of longitudinal effective rigidity ratio with the transverse rigidity and the influential region of the longitudinal joints. The analytical results show that，as the transverse rigidity decreases，the area of compressive region increases and the longitudinal effective rigidity ratio decreases. As the influential region of the longitudinal joints increases，the longitudinal effective rigidity ratio decreases. Both the conventional and the modified longitudinal equivalent continuous models can be regarded as special cases of the proposed model. The proposed model is more widely applicable and is of reference value for longitudinal stability analysis of shield tunnels.
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Received: 30 October 2008
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