This paper presents a study of tunnel's behaviour under earthquake forces using the finite element method and the time history analysis. A computer program based on the finite elements theory using isoparametric eight-node quadrilateral elements is prepared to be used on the VME 2900 system of Cairo University Computer Center. The acceleration time history of El-Centro earthquake is used as input for ground motion. A parametric study is made on a typical rectangular tunnel section to show the effect of different natural parameters on it. These parameters are the type of soil, the area of tunnel, the embedment ratio, and the rectangularity ratio. A practical case of a major embedded structure in Egypt is studied, that is, the Greater Cairo Regional Metro. The seismic and static response of a typical section of the metro tunnel is presented. Finally, based on the above-mentioned parametric and practical study, conclusions are summarized and presented.

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